ConcurrentDictionary`2.xml

<Type Name="ConcurrentDictionary&lt;TKey,TValue&gt;" FullName="System.Collections.Concurrent.ConcurrentDictionary&lt;TKey,TValue&gt;">
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    <typeparam name="TKey">The type of the keys in the dictionary.</typeparam>
    <typeparam name="TValue">The type of the values in the dictionary.</typeparam>
    <summary>Represents a thread-safe collection of key/value pairs that can be accessed by multiple threads concurrently.</summary>
    <remarks>
      <format type="text/markdown"><![CDATA[

## Remarks
 For very large <xref:System.Collections.Concurrent.ConcurrentDictionary%602> objects, you can increase the maximum array size to 2 gigabytes (GB) on a 64-bit system by setting the [`<gcAllowVeryLargeObjects>`](/dotnet/framework/configure-apps/file-schema/runtime/gcallowverylargeobjects-element) configuration element to `true` in the run-time environment.

> [!NOTE]
>  <xref:System.Collections.Concurrent.ConcurrentDictionary%602> implements the <xref:System.Collections.Generic.IReadOnlyCollection%601> and <xref:System.Collections.Generic.IReadOnlyDictionary%602> interfaces starting with the .NET Framework 4.6; in previous versions of the .NET Framework, the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class did not implement these interfaces.

 Like the <xref:System.Collections.Generic.Dictionary%602?displayProperty=nameWithType> class, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> implements the <xref:System.Collections.Generic.IDictionary%602> interface. In addition, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> provides several methods for adding or updating key/value pairs in the dictionary, as described in the following table.

| To do this | Use this method | Usage notes |
|------------|-----------------|-------------|
|Add a new key to the dictionary, if it doesn't already exist in the dictionary|<xref:System.Collections.Concurrent.ConcurrentDictionary%602.TryAdd%2A>|This method adds the specified key/value pair, if the key doesn't currently exist in the dictionary. The method returns `true` or `false` depending on whether the new pair was added.|
|Update the value for an existing key in the dictionary, if that key has a specific value|<xref:System.Collections.Concurrent.ConcurrentDictionary%602.TryUpdate%2A>|This method checks whether the key has a specified value, and if it does, updates the key with a new value. It's similar to the <xref:System.Threading.Interlocked.CompareExchange%2A> method, except that it's used for dictionary elements.|
|Store a key/value pair in the dictionary unconditionally, and overwrite the value of a key that already exists|The indexer's setter: `dictionary[key] = newValue`| |
|Add a key/value pair to the dictionary, or if the key already exists, update the value for the key based on the key's existing value|<xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%28%600%2CSystem.Func%7B%600%2C%601%7D%2CSystem.Func%7B%600%2C%601%2C%601%7D%29><br /><br /> -or-<br /><br /> <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%28%600%2C%601%2CSystem.Func%7B%600%2C%601%2C%601%7D%29>|<xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%28%600%2CSystem.Func%7B%600%2C%601%7D%2CSystem.Func%7B%600%2C%601%2C%601%7D%29> accepts the key and two delegates. It uses the first delegate if the key doesn't exist in the dictionary; it accepts the key and returns the value that should be added for the key. It uses the second delegate if the key does exist; it accepts the key and its current value, and it returns the new value that should be set for the key.<br /><br /> <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%28%600%2C%601%2CSystem.Func%7B%600%2C%601%2C%601%7D%29> accepts the key, a value to add, and the update delegate. This is the same as the previous overload, except that it doesn't use a delegate to add a key.|
|Get the value for a key in the dictionary, adding the value to the dictionary and returning it if the key doesn't exist|<xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%28%600%2C%601%29><br /><br /> -or-<br /><br /> <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%28%600%2CSystem.Func%7B%600%2C%601%7D%29>|These overloads provide lazy initialization for a key/value pair in the dictionary, adding the value only if it's not there.<br /><br /> <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%28%600%2C%601%29> takes the value to be added if the key doesn't exist.<br /><br /> <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%28%600%2CSystem.Func%7B%600%2C%601%7D%29> takes a delegate that will generate the value if the key doesn't exist.|

 All these operations are atomic and are thread-safe with regards to all other operations on the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class. The only exceptions are the methods that accept a delegate, that is, <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> and <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A>. For modifications and write operations to the dictionary, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) However, delegates for these methods are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, the code executed by these delegates is not subject to the atomicity of the operation.



## Examples
 The following example shows how to construct a <xref:System.Collections.Concurrent.ConcurrentDictionary%602> object.

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrent.concurrentdictionary/vb/concdictionary.vb" id="Snippet1":::

 ]]></format>
    </remarks>
    <threadsafe>All public and protected members of <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> are thread-safe and may be used concurrently from multiple threads. However, members accessed through one of the interfaces the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> implements, including extension methods, are not guaranteed to be thread safe and may need to be synchronized by the caller.</threadsafe>
    <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
    <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <summary>Initializes a new instance of the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> class.</summary>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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## Remarks
 The default concurrency level is equal to the number of CPUs. The higher the concurrency level is, the more concurrent write operations can take place without interference and blocking. Higher concurrency level values also cause operations that require all locks (for example, table resizing, `ToArray` and `Count`) to become more expensive. The default capacity (DEFAULT_CAPACITY), which represents the initial number of buckets, is a trade-off between the size of a very small dictionary and the number of resizes when constructing a large dictionary. Also, the capacity should not be divisible by a small prime number. The default capacity is 31.

 ]]></format>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <param name="concurrencyLevel">The estimated number of threads that will update the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> concurrently, or in .NET 8+ only, -1 to indicate the default concurrency level.</param>
        <param name="collection">The <see cref="T:System.Collections.Generic.IEnumerable`1" /> whose elements are copied to the new <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</param>
        <param name="comparer">The <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> implementation to use when comparing keys.</param>
        <summary>Initializes a new instance of the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> class that contains elements copied from the specified <see cref="T:System.Collections.IEnumerable" />, and uses the specified <see cref="T:System.Collections.Generic.IEqualityComparer`1" />.</summary>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="collection" /> or <paramref name="comparer" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="concurrencyLevel" /> is less than 1.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="collection" /> contains one or more duplicate keys.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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          <Attributes>
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        <param name="concurrencyLevel">The estimated number of threads that will update the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> concurrently, or in .NET 8+ only, -1 to indicate the default concurrency level.</param>
        <param name="capacity">The initial number of elements that the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> can contain.</param>
        <param name="comparer">The <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> implementation to use when comparing keys.</param>
        <summary>Initializes a new instance of the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> class that is empty, has the specified concurrency level, has the specified initial capacity, and uses the specified <see cref="T:System.Collections.Generic.IEqualityComparer`1" />.</summary>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="comparer" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="concurrencyLevel" /> or <paramref name="capacity" /> is less than 1.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <summary>Adds a key/value pair to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key does not already exist, or updates a key/value pair in the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key already exists.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Examples
 The following example shows how to call the <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> method:

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.cs" id="Snippet3":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.fs" id="Snippet3":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrent.concurrentdictionary/vb/concdictionary.vb" id="Snippet3":::

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <Parameter Name="updateValueFactory" Type="System.Func&lt;TKey,TValue,TValue&gt;" />
      </Parameters>
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        <param name="key">The key to be added or whose value should be updated.</param>
        <param name="addValueFactory">The function used to generate a value for an absent key.</param>
        <param name="updateValueFactory">The function used to generate a new value for an existing key based on the key's existing value.</param>
        <summary>Uses the specified functions to add a key/value pair to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key does not already exist, or to update a key/value pair in the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key already exists.</summary>
        <returns>The new value for the key. This will be either be the result of <paramref name="addValueFactory" /> (if the key was absent) or the result of <paramref name="updateValueFactory" /> (if the key was present).</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If you call <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> simultaneously on different threads, `addValueFactory` may be called multiple times, but its key/value pair might not be added to the dictionary for every call.

 For modifications and write operations to the dictionary, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> uses fine-grained locking to ensure thread safety (read operations on the dictionary are performed in a lock-free manner). The `addValueFactory` and `updateValueFactory` delegates may be executed multiple times to verify the value was added or updated as expected. However, they are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> is not atomic with regards to all other operations on the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" />, <paramref name="addValueFactory" />, or <paramref name="updateValueFactory" /> is <see langword="null" />.</exception>
        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <param name="key">The key to be added or whose value should be updated.</param>
        <param name="addValue">The value to be added for an absent key.</param>
        <param name="updateValueFactory">The function used to generate a new value for an existing key based on the key's existing value.</param>
        <summary>Adds a key/value pair to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key does not already exist, or updates a key/value pair in the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> by using the specified function if the key already exists.</summary>
        <returns>The new value for the key. This will be either be <paramref name="addValue" /> (if the key was absent) or the result of <paramref name="updateValueFactory" /> (if the key was present).</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Examples
 The following code example shows how to initialize an <xref:System.Collections.Concurrent.ConcurrentDictionary%602> and how to use the AddOrUpdate method to add an additional item to the collection, and update the existing items.

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/AddOrUpdate/program.cs" id="Snippet1":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/AddOrUpdate/program.fs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrentcoladdupdate/vb/module1.vb" id="Snippet1":::

## Remarks
 For modifications and write operations to the dictionary, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) The `addValueFactory` and `updateValueFactory` delegates may be executed multiple times to verify the value was added or updated as expected. However, they are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> is not atomic with regards to all other operations on the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> or <paramref name="updateValueFactory" /> is <see langword="null" />.</exception>
        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <Parameter Name="addValueFactory" Type="System.Func&lt;TKey,TArg,TValue&gt;" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-4.7.2;netframework-4.8;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0;net-10.0" />
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        <typeparam name="TArg">The type of an argument to pass into <paramref name="addValueFactory" /> and <paramref name="updateValueFactory" />.</typeparam>
        <param name="key">The key to be added or whose value should be updated.</param>
        <param name="addValueFactory">The function used to generate a value for an absent key.</param>
        <param name="updateValueFactory">The function used to generate a new value for an existing key based on the key's existing value.</param>
        <param name="factoryArgument">An argument to pass into <paramref name="addValueFactory" /> and <paramref name="updateValueFactory" />.</param>
        <summary>Uses the specified functions and argument to add a key/value pair to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key does not already exist, or to update a key/value pair in the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> if the key already exists.</summary>
        <returns>The new value for the key. This will be either be the result of <paramref name="addValueFactory" /> (if the key was absent) or the result of <paramref name="updateValueFactory" /> (if the key was present).</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 If you call <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> simultaneously on different threads, `addValueFactory` may be called multiple times, but its key/value pair might not be added to the dictionary for every call.

 For modifications and write operations to the dictionary, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) The `addValueFactory` and `updateValueFactory` delegates may be executed multiple times to verify the value was added or updated as expected. However, they are called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> is not atomic with regards to all other operations on the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class.

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" />, <paramref name="addValueFactory" />, or <paramref name="updateValueFactory" /> is a null reference (Nothing in Visual Basic).</exception>
        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
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        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

<xref:System.Collections.Concurrent.ConcurrentDictionary`2> requires an equality implementation to determine
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            generic interface by using a constructor that accepts a comparer parameter;
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          ]]></format>
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        <remarks>To be added.</remarks>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property has snapshot semantics and represents the number of items in the <xref:System.Collections.Concurrent.ConcurrentDictionary%602?displayProperty=nameWithType> at the moment when the property was accessed.

 ]]></format>
        </remarks>
        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The enumerator returned from the dictionary is safe to use concurrently with reads and writes to the dictionary, however it does not represent a moment-in-time snapshot of the dictionary. The contents exposed through the enumerator may contain modifications made to the dictionary after <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetEnumerator%2A> was called.

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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      <Docs>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Examples
 The following example shows how to call the <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> method:

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.cs" id="Snippet3":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.fs" id="Snippet3":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrent.concurrentdictionary/vb/concdictionary.vb" id="Snippet3":::

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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          <format type="text/markdown"><![CDATA[

## Remarks
 For modifications and write operations to the dictionary, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) However, the `valueFactory` delegate is called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> is not atomic with regards to all other operations on the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class.

 Since a key/value can be inserted by another thread while `valueFactory` is generating a value, you cannot trust that just because `valueFactory` executed, its produced value will be inserted into the dictionary and returned. If you call <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> simultaneously on different threads, `valueFactory` may be called multiple times, but only one key/value pair will be added to the dictionary.

 The return value depends on the presence of the key in the dictionary and whether a key/value is inserted by another thread after <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> is called but before `valueFactory` generates a value:

 | Scenario | Return value |
 | -------- | ------------ |
 | The key is already in the dictionary. | The existing value is returned. |
 | The key is not in the dictionary. `valueFactory` generates a value. On rechecking for the key, no key is found. | The key/value is inserted into the dictionary, and the value is returned. |
 | The key is not in the dictionary. `valueFactory` generates a value. While `valueFactory` is generating the value, a different thread inserts a value for the key. After `valueFactory` executes and upon rechecking for the key, the key inserted by the other thread is found. | The value inserted by the other thread is returned. |

 ]]></format>
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        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <param name="key">The key of the element to add.</param>
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        <param name="factoryArgument">An argument value to pass into <paramref name="valueFactory" />.</param>
        <summary>Adds a key/value pair to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> by using the specified function and an argument if the key does not already exist, or returns the existing value if the key exists.</summary>
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        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 For modifications and write operations to the dictionary, <xref:System.Collections.Concurrent.ConcurrentDictionary%602> uses fine-grained locking to ensure thread safety. (Read operations on the dictionary are performed in a lock-free manner.) However, the `valueFactory` delegate is called outside the locks to avoid the problems that can arise from executing unknown code under a lock. Therefore, <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> is not atomic with regards to all other operations on the <xref:System.Collections.Concurrent.ConcurrentDictionary%602> class.

 Since a key/value can be inserted by another thread while `valueFactory` is generating a value, you cannot trust that just because `valueFactory` executed, its produced value will be inserted into the dictionary and returned. If you call <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> simultaneously on different threads, `valueFactory` may be called multiple times, but only one key/value pair will be added to the dictionary.

 The return value depends on the presence of the key in the dictionary and whether a key/value is inserted by another thread after <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetOrAdd%2A> is called but before `valueFactory` generates a value:

 | Scenario | Return value |
 | -------- | ------------ |
 | The key is already in the dictionary. | The existing value is returned. |
 | The key is not in the dictionary. `valueFactory` generates a value. On rechecking for the key, no key is found. | The key/value is inserted into the dictionary, and the value is returned. |
 | The key is not in the dictionary. `valueFactory` generates a value. While `valueFactory` is generating the value, a different thread inserts a value for the key. After `valueFactory` executes and upon rechecking for the key, the key inserted by the other thread is found. | The value inserted by the other thread is returned. |

 ]]></format>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
        <exception cref="T:System.ArgumentNullException">The <see cref="P:System.Collections.Generic.KeyValuePair`2.Key" /> of <paramref name="keyValuePair" /> is <see langword="null" />.</exception>
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        <exception cref="T:System.ArgumentException">An element with the same key already exists in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</exception>
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        <Parameter Name="keyValuePair" Type="System.Collections.Generic.KeyValuePair&lt;TKey,TValue&gt;" />
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        <param name="keyValuePair">The key to locate in the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
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          <see langword="true" /> if the <see cref="T:System.Collections.Generic.ICollection`1" /> contains an element with the specified key; otherwise, <see langword="false" />.</returns>
        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <Parameter Name="array" Type="System.Collections.Generic.KeyValuePair&lt;TKey,TValue&gt;[]" />
        <Parameter Name="index" Type="System.Int32" />
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        <summary>Copies the elements of the <see cref="T:System.Collections.ICollection" /> to an array, starting at the specified array index.</summary>
        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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          <paramref name="array" /> is <see langword="null" />.</exception>
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          <paramref name="index" /> is equal to or greater than the length of the <paramref name="array" />.

-or-

The number of elements in the source <see cref="T:System.Collections.ICollection" /> is greater than the available space from <paramref name="index" /> to the end of the destination <paramref name="array" />.</exception>
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        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
        <exception cref="T:System.ArgumentNullException">The <see cref="P:System.Collections.Generic.KeyValuePair`2.Key" /> property of <paramref name="keyValuePair" /> is <see langword="null" />.</exception>
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        <remarks>To be added.</remarks>
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        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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      <MemberSignature Language="VB.NET" Value="Function Remove (key As TKey) As Boolean Implements IDictionary(Of TKey, TValue).Remove" />
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        <InterfaceMember>M:System.Collections.Generic.IDictionary`2.Remove(`0)</InterfaceMember>
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        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is <see langword="null" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
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    </Member>
    <Member MemberName="System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Keys">
      <MemberSignature Language="C#" Value="System.Collections.Generic.IEnumerable&lt;TKey&gt; System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Keys { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.Generic.IEnumerable`1&lt;!TKey&gt; System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Keys" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#Generic#IReadOnlyDictionary&lt;TKey,TValue&gt;#Keys" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property Keys As IEnumerable(Of TKey) Implements IReadOnlyDictionary(Of TKey, TValue).Keys" />
      <MemberSignature Language="F#" Value="member this.System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Keys : seq&lt;'Key&gt;" Usage="System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Keys" />
      <MemberSignature Language="C++ CLI" Value="property System::Collections::Generic::IEnumerable&lt;TKey&gt; ^ System::Collections::Generic::IReadOnlyDictionary&lt;TKey,TValue&gt;::Keys { System::Collections::Generic::IEnumerable&lt;TKey&gt; ^ get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.Generic.IReadOnlyDictionary`2.Keys</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.Generic.IEnumerable&lt;TKey&gt;</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a collection containing the keys in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</summary>
        <value>A collection containing the keys in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</value>
        <remarks>To be added.</remarks>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Values">
      <MemberSignature Language="C#" Value="System.Collections.Generic.IEnumerable&lt;TValue&gt; System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Values { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.Generic.IEnumerable`1&lt;!TValue&gt; System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Values" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#Generic#IReadOnlyDictionary&lt;TKey,TValue&gt;#Values" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property Values As IEnumerable(Of TValue) Implements IReadOnlyDictionary(Of TKey, TValue).Values" />
      <MemberSignature Language="F#" Value="member this.System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Values : seq&lt;'Value&gt;" Usage="System.Collections.Generic.IReadOnlyDictionary&lt;TKey,TValue&gt;.Values" />
      <MemberSignature Language="C++ CLI" Value="property System::Collections::Generic::IEnumerable&lt;TValue&gt; ^ System::Collections::Generic::IReadOnlyDictionary&lt;TKey,TValue&gt;::Values { System::Collections::Generic::IEnumerable&lt;TValue&gt; ^ get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.Generic.IReadOnlyDictionary`2.Values</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.Generic.IEnumerable&lt;TValue&gt;</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a collection that contains the values in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</summary>
        <value>A collection that contains the values in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</value>
        <remarks>To be added.</remarks>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.ICollection.CopyTo">
      <MemberSignature Language="C#" Value="void ICollection.CopyTo (Array array, int index);" />
      <MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance void System.Collections.ICollection.CopyTo(class System.Array array, int32 index) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#ICollection#CopyTo(System.Array,System.Int32)" />
      <MemberSignature Language="VB.NET" Value="Sub CopyTo (array As Array, index As Integer) Implements ICollection.CopyTo" />
      <MemberSignature Language="F#" Value="abstract member System.Collections.ICollection.CopyTo : Array * int -&gt; unit&#xA;override this.System.Collections.ICollection.CopyTo : Array * int -&gt; unit" Usage="concurrentDictionary.System.Collections.ICollection.CopyTo (array, index)" />
      <MemberSignature Language="C++ CLI" Value=" virtual void System.Collections.ICollection.CopyTo(Array ^ array, int index) = System::Collections::ICollection::CopyTo;" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.ICollection.CopyTo(System.Array,System.Int32)</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="array" Type="System.Array" />
        <Parameter Name="index" Type="System.Int32" />
      </Parameters>
      <Docs>
        <param name="array">The one-dimensional array that is the destination of the elements copied from the <see cref="T:System.Collections.ICollection" />. The array must have zero-based indexing.</param>
        <param name="index">The zero-based index in <paramref name="array" /> at which copying begins.</param>
        <summary>Copies the elements of the <see cref="T:System.Collections.ICollection" /> to an array, starting at the specified array index.</summary>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="array" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentOutOfRangeException">
          <paramref name="index" /> is less than 0.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="index" /> is equal to or greater than the length of the <paramref name="array" />.

 -or-

 The number of elements in the source <see cref="T:System.Collections.ICollection" /> is greater than the available space from <paramref name="index" /> to the end of the destination <paramref name="array" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.ICollection.IsSynchronized">
      <MemberSignature Language="C#" Value="bool System.Collections.ICollection.IsSynchronized { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool System.Collections.ICollection.IsSynchronized" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#ICollection#IsSynchronized" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property IsSynchronized As Boolean Implements ICollection.IsSynchronized" />
      <MemberSignature Language="F#" Value="member this.System.Collections.ICollection.IsSynchronized : bool" Usage="System.Collections.ICollection.IsSynchronized" />
      <MemberSignature Language="C++ CLI" Value="property bool System::Collections::ICollection::IsSynchronized { bool get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.ICollection.IsSynchronized</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a value that indicates whether access to the <see cref="T:System.Collections.ICollection" /> is synchronized with the SyncRoot.</summary>
        <value>
          <see langword="true" /> if access to the <see cref="T:System.Collections.ICollection" /> is synchronized (thread safe); otherwise, <see langword="false" />. For <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> this property always returns <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.ICollection> interface.

          ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.ICollection.SyncRoot">
      <MemberSignature Language="C#" Value="object System.Collections.ICollection.SyncRoot { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance object System.Collections.ICollection.SyncRoot" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#ICollection#SyncRoot" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property SyncRoot As Object Implements ICollection.SyncRoot" />
      <MemberSignature Language="F#" Value="member this.System.Collections.ICollection.SyncRoot : obj" Usage="System.Collections.ICollection.SyncRoot" />
      <MemberSignature Language="C++ CLI" Value="property System::Object ^ System::Collections::ICollection::SyncRoot { System::Object ^ get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.ICollection.SyncRoot</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Object</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets an object that can be used to synchronize access to the <see cref="T:System.Collections.ICollection" />. This property is not supported.</summary>
        <value>Always returns null.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.ICollection> interface.

          ]]></format>
        </remarks>
        <exception cref="T:System.NotSupportedException">This property is not supported.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.Add">
      <MemberSignature Language="C#" Value="void IDictionary.Add (object key, object value);" />
      <MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance void System.Collections.IDictionary.Add(object key, object value) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#Add(System.Object,System.Object)" />
      <MemberSignature Language="VB.NET" Value="Sub Add (key As Object, value As Object) Implements IDictionary.Add" />
      <MemberSignature Language="F#" Value="abstract member System.Collections.IDictionary.Add : obj * obj -&gt; unit&#xA;override this.System.Collections.IDictionary.Add : obj * obj -&gt; unit" Usage="concurrentDictionary.System.Collections.IDictionary.Add (key, value)" />
      <MemberSignature Language="C++ CLI" Value=" virtual void System.Collections.IDictionary.Add(System::Object ^ key, System::Object ^ value) = System::Collections::IDictionary::Add;" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.IDictionary.Add(System.Object,System.Object)</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="System.Object" />
        <Parameter Name="value" Type="System.Object" />
      </Parameters>
      <Docs>
        <param name="key">The object to use as the key.</param>
        <param name="value">The object to use as the value.</param>
        <summary>Adds the specified key and value to the dictionary.</summary>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">
          <paramref name="key" /> is of a type that is not assignable to the key type  of the <see cref="T:System.Collections.Generic.Dictionary`2" />.

 -or-

 <paramref name="value" /> is of a type that is not assignable to the type of values in the <see cref="T:System.Collections.Generic.Dictionary`2" />.

 -or-

 A value with the same key already exists in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</exception>
        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.Contains">
      <MemberSignature Language="C#" Value="bool IDictionary.Contains (object key);" />
      <MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance bool System.Collections.IDictionary.Contains(object key) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#Contains(System.Object)" />
      <MemberSignature Language="VB.NET" Value="Function Contains (key As Object) As Boolean Implements IDictionary.Contains" />
      <MemberSignature Language="F#" Value="abstract member System.Collections.IDictionary.Contains : obj -&gt; bool&#xA;override this.System.Collections.IDictionary.Contains : obj -&gt; bool" Usage="concurrentDictionary.System.Collections.IDictionary.Contains key" />
      <MemberSignature Language="C++ CLI" Value=" virtual bool System.Collections.IDictionary.Contains(System::Object ^ key) = System::Collections::IDictionary::Contains;" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.IDictionary.Contains(System.Object)</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="System.Object" />
      </Parameters>
      <Docs>
        <param name="key">The key to locate in the <see cref="T:System.Collections.Generic.IDictionary`2" />.</param>
        <summary>Gets a value that indicates the <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an element with the specified key.</summary>
        <returns>
          <see langword="true" /> if the <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an element with the specified key; otherwise, <see langword="false" />.</returns>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is <see langword="null" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.GetEnumerator">
      <MemberSignature Language="C#" Value="System.Collections.IDictionaryEnumerator IDictionary.GetEnumerator ();" />
      <MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance class System.Collections.IDictionaryEnumerator System.Collections.IDictionary.GetEnumerator() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#GetEnumerator" />
      <MemberSignature Language="VB.NET" Value="Function GetEnumerator () As IDictionaryEnumerator Implements IDictionary.GetEnumerator" />
      <MemberSignature Language="F#" Value="abstract member System.Collections.IDictionary.GetEnumerator : unit -&gt; System.Collections.IDictionaryEnumerator&#xA;override this.System.Collections.IDictionary.GetEnumerator : unit -&gt; System.Collections.IDictionaryEnumerator" Usage="concurrentDictionary.System.Collections.IDictionary.GetEnumerator " />
      <MemberSignature Language="C++ CLI" Value=" virtual System::Collections::IDictionaryEnumerator ^ System.Collections.IDictionary.GetEnumerator() = System::Collections::IDictionary::GetEnumerator;" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.IDictionary.GetEnumerator</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.IDictionaryEnumerator</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Provides a <see cref="T:System.Collections.IDictionaryEnumerator" /> for the <see cref="T:System.Collections.Generic.IDictionary`2" />.</summary>
        <returns>A <see cref="T:System.Collections.IDictionaryEnumerator" /> for the <see cref="T:System.Collections.Generic.IDictionary`2" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.IDictionary> interface.

          ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.IsFixedSize">
      <MemberSignature Language="C#" Value="bool System.Collections.IDictionary.IsFixedSize { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool System.Collections.IDictionary.IsFixedSize" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#IsFixedSize" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property IsFixedSize As Boolean Implements IDictionary.IsFixedSize" />
      <MemberSignature Language="F#" Value="member this.System.Collections.IDictionary.IsFixedSize : bool" Usage="System.Collections.IDictionary.IsFixedSize" />
      <MemberSignature Language="C++ CLI" Value="property bool System::Collections::IDictionary::IsFixedSize { bool get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.IDictionary.IsFixedSize</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a value that indicates whether the <see cref="T:System.Collections.Generic.IDictionary`2" /> has a fixed size.</summary>
        <value>
          <see langword="true" /> if the <see cref="T:System.Collections.Generic.IDictionary`2" /> has a fixed size; otherwise, <see langword="false" />. For <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />, this property always returns <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.IDictionary> interface.

          ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.IsReadOnly">
      <MemberSignature Language="C#" Value="bool System.Collections.IDictionary.IsReadOnly { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance bool System.Collections.IDictionary.IsReadOnly" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#IsReadOnly" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property IsReadOnly As Boolean Implements IDictionary.IsReadOnly" />
      <MemberSignature Language="F#" Value="member this.System.Collections.IDictionary.IsReadOnly : bool" Usage="System.Collections.IDictionary.IsReadOnly" />
      <MemberSignature Language="C++ CLI" Value="property bool System::Collections::IDictionary::IsReadOnly { bool get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.IDictionary.IsReadOnly</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a value that indicates whether the <see cref="T:System.Collections.Generic.IDictionary`2" /> is read-only.</summary>
        <value>
          <see langword="true" /> if the <see cref="T:System.Collections.Generic.IDictionary`2" /> is read-only; otherwise, <see langword="false" />. For <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />, this property always returns <see langword="false" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.IDictionary> interface.

          ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.Item">
      <MemberSignature Language="C#" Value="object System.Collections.IDictionary.Item[object key] { get; set; }" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1" />
      <MemberSignature Language="ILAsm" Value=".property instance object System.Collections.IDictionary.Item(object)" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#Item(System.Object)" />
      <MemberSignature Language="VB.NET" Value=" Property Item(key As Object) As Object Implements IDictionary.Item" />
      <MemberSignature Language="F#" Value="member this.System.Collections.IDictionary.Item(obj) : obj with get, set" Usage="System.Collections.IDictionary.Item" />
      <MemberSignature Language="C++ CLI" Value="property System::Object ^ System::Collections::IDictionary::Item[System::Object ^] { System::Object ^ get(System::Object ^ key); void set(System::Object ^ key, System::Object ^ value); };" />
      <MemberSignature Language="C#" Value="object? System.Collections.IDictionary.Item[object key] { get; set; }" FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.IDictionary.Item(System.Object)</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <Attributes>
        <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
          <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(2)&gt;]</AttributeName>
        </Attribute>
      </Attributes>
      <ReturnValue>
        <ReturnType>System.Object</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="System.Object" />
      </Parameters>
      <Docs>
        <param name="key">The key of the value to get or set.</param>
        <summary>Gets or sets the value associated with the specified key.</summary>
        <value>The value associated with the specified key, or  <see langword="null" /> if <paramref name="key" /> is not in the dictionary or <paramref name="key" /> is of a type that is not assignable to the key type of the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</value>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is  <see langword="null" />.</exception>
        <exception cref="T:System.ArgumentException">A value is being assigned, and <paramref name="key" /> is of a type that is not assignable to the key type or the value type of the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.Keys">
      <MemberSignature Language="C#" Value="System.Collections.ICollection System.Collections.IDictionary.Keys { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.ICollection System.Collections.IDictionary.Keys" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#Keys" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property Keys As ICollection Implements IDictionary.Keys" />
      <MemberSignature Language="F#" Value="member this.System.Collections.IDictionary.Keys : System.Collections.ICollection" Usage="System.Collections.IDictionary.Keys" />
      <MemberSignature Language="C++ CLI" Value="property System::Collections::ICollection ^ System::Collections::IDictionary::Keys { System::Collections::ICollection ^ get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.IDictionary.Keys</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.ICollection</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets an <see cref="T:System.Collections.ICollection" /> that contains the keys of the  <see cref="T:System.Collections.Generic.IDictionary`2" />.</summary>
        <value>An interface that contains the keys of the <see cref="T:System.Collections.Generic.IDictionary`2" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.IDictionary> interface.

          ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.Remove">
      <MemberSignature Language="C#" Value="void IDictionary.Remove (object key);" />
      <MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance void System.Collections.IDictionary.Remove(object key) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#Remove(System.Object)" />
      <MemberSignature Language="VB.NET" Value="Sub Remove (key As Object) Implements IDictionary.Remove" />
      <MemberSignature Language="F#" Value="abstract member System.Collections.IDictionary.Remove : obj -&gt; unit&#xA;override this.System.Collections.IDictionary.Remove : obj -&gt; unit" Usage="concurrentDictionary.System.Collections.IDictionary.Remove key" />
      <MemberSignature Language="C++ CLI" Value=" virtual void System.Collections.IDictionary.Remove(System::Object ^ key) = System::Collections::IDictionary::Remove;" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.IDictionary.Remove(System.Object)</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="System.Object" />
      </Parameters>
      <Docs>
        <param name="key">The key of the element to remove.</param>
        <summary>Removes the element with the specified key from the <see cref="T:System.Collections.IDictionary" />.</summary>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is <see langword="null" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IDictionary.Values">
      <MemberSignature Language="C#" Value="System.Collections.ICollection System.Collections.IDictionary.Values { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.ICollection System.Collections.IDictionary.Values" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IDictionary#Values" />
      <MemberSignature Language="VB.NET" Value=" ReadOnly Property Values As ICollection Implements IDictionary.Values" />
      <MemberSignature Language="F#" Value="member this.System.Collections.IDictionary.Values : System.Collections.ICollection" Usage="System.Collections.IDictionary.Values" />
      <MemberSignature Language="C++ CLI" Value="property System::Collections::ICollection ^ System::Collections::IDictionary::Values { System::Collections::ICollection ^ get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.IDictionary.Values</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.ICollection</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets an <see cref="T:System.Collections.ICollection" /> that contains the values in the <see cref="T:System.Collections.IDictionary" />.</summary>
        <value>An interface that contains the values in the <see cref="T:System.Collections.IDictionary" />.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This member is an explicit interface member implementation. It can be used only when the <xref:System.Collections.Concurrent.ConcurrentDictionary`2> instance is cast to an <xref:System.Collections.IDictionary> interface.

          ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="System.Collections.IEnumerable.GetEnumerator">
      <MemberSignature Language="C#" Value="System.Collections.IEnumerator IEnumerable.GetEnumerator ();" />
      <MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance class System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.System#Collections#IEnumerable#GetEnumerator" />
      <MemberSignature Language="VB.NET" Value="Function GetEnumerator () As IEnumerator Implements IEnumerable.GetEnumerator" />
      <MemberSignature Language="F#" Value="abstract member System.Collections.IEnumerable.GetEnumerator : unit -&gt; System.Collections.IEnumerator&#xA;override this.System.Collections.IEnumerable.GetEnumerator : unit -&gt; System.Collections.IEnumerator" Usage="concurrentDictionary.System.Collections.IEnumerable.GetEnumerator " />
      <MemberSignature Language="C++ CLI" Value=" virtual System::Collections::IEnumerator ^ System.Collections.IEnumerable.GetEnumerator() = System::Collections::IEnumerable::GetEnumerator;" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.IEnumerable.GetEnumerator</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.IEnumerator</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Returns an enumerator that iterates through the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</summary>
        <returns>An enumerator for the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 The enumerator returned from the dictionary is safe to use concurrently with reads and writes to the dictionary, however it does not represent a moment-in-time snapshot of the dictionary. The contents exposed through the enumerator may contain modifications made to the dictionary after <xref:System.Collections.Concurrent.ConcurrentDictionary%602.GetEnumerator%2A> was called.

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="ToArray">
      <MemberSignature Language="C#" Value="public System.Collections.Generic.KeyValuePair&lt;TKey,TValue&gt;[] ToArray ();" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig instance valuetype System.Collections.Generic.KeyValuePair`2&lt;!TKey, !TValue&gt;[] ToArray() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.ToArray" />
      <MemberSignature Language="VB.NET" Value="Public Function ToArray () As KeyValuePair(Of TKey, TValue)()" />
      <MemberSignature Language="F#" Value="member this.ToArray : unit -&gt; System.Collections.Generic.KeyValuePair&lt;'Key, 'Value&gt;[]" Usage="concurrentDictionary.ToArray " />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; cli::array &lt;System::Collections::Generic::KeyValuePair&lt;TKey, TValue&gt;&gt; ^ ToArray();" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.Generic.KeyValuePair&lt;TKey,TValue&gt;[]</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Copies the key and value pairs stored in the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> to a new array.</summary>
        <returns>A new array containing a snapshot of key and value pairs copied from the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</returns>
        <remarks>To be added.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="TryAdd">
      <MemberSignature Language="C#" Value="public bool TryAdd (TKey key, TValue value);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool TryAdd(!TKey key, !TValue value) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.TryAdd(`0,`1)" />
      <MemberSignature Language="VB.NET" Value="Public Function TryAdd (key As TKey, value As TValue) As Boolean" />
      <MemberSignature Language="F#" Value="member this.TryAdd : 'Key * 'Value -&gt; bool" Usage="concurrentDictionary.TryAdd (key, value)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; bool TryAdd(TKey key, TValue value);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="TKey" />
        <Parameter Name="value" Type="TValue" />
      </Parameters>
      <Docs>
        <param name="key">The key of the element to add.</param>
        <param name="value">The value of the element to add. The value can be  <see langword="null" /> for reference types.</param>
        <summary>Attempts to add the specified key and value to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</summary>
        <returns>
          <see langword="true" /> if the key/value pair was added to the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> successfully; <see langword="false" /> if the key already exists.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method returns `false` if the key already exists. Use the <xref:System.Collections.Concurrent.ConcurrentDictionary%602.TryUpdate%2A> or <xref:System.Collections.Concurrent.ConcurrentDictionary%602.AddOrUpdate%2A> method to update the value in case a key already exists.



## Examples
 The following example shows how to call the <xref:System.Collections.Concurrent.ConcurrentDictionary%602.TryAdd%2A?displayProperty=nameWithType> method:

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.cs" id="Snippet2":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.fs" id="Snippet2":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrent.concurrentdictionary/vb/concdictionary.vb" id="Snippet2":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is  <see langword="null" />.</exception>
        <exception cref="T:System.OverflowException">The dictionary contains too many elements.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="TryGetAlternateLookup&lt;TAlternateKey&gt;">
      <MemberSignature Language="C#" Value="public bool TryGetAlternateLookup&lt;TAlternateKey&gt; (out System.Collections.Concurrent.ConcurrentDictionary&lt;TKey,TValue&gt;.AlternateLookup&lt;TAlternateKey&gt; lookup) where TAlternateKey : allows ref struct;" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool TryGetAlternateLookup&lt;TAlternateKey&gt;([out] valuetype System.Collections.Concurrent.ConcurrentDictionary`2/AlternateLookup`1&lt;!TKey, !TValue, !!TAlternateKey&gt;&amp; lookup) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.TryGetAlternateLookup``1(System.Collections.Concurrent.ConcurrentDictionary`2.AlternateLookup{`0,`1,``0}@)" />
      <MemberSignature Language="VB.NET" Value="Public Function TryGetAlternateLookup(Of TAlternateKey) (ByRef lookup As ConcurrentDictionary(Of TKey, TValue).AlternateLookup(Of TAlternateKey)) As Boolean" />
      <MemberSignature Language="F#" Value="member this.TryGetAlternateLookup : AlternateLookup -&gt; bool" Usage="concurrentDictionary.TryGetAlternateLookup lookup" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA;generic &lt;typename TAlternateKey&gt;&#xA; bool TryGetAlternateLookup([Runtime::InteropServices::Out] System::Collections::Concurrent::ConcurrentDictionary&lt;TKey, TValue&gt;::AlternateLookup&lt;TAlternateKey&gt; % lookup);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <TypeParameters>
        <TypeParameter Name="TAlternateKey">
          <Constraints>
            <ParameterAttribute>AllowByRefLike</ParameterAttribute>
          </Constraints>
        </TypeParameter>
      </TypeParameters>
      <Parameters>
        <Parameter Name="lookup" Type="System.Collections.Concurrent.ConcurrentDictionary&lt;TKey,TValue&gt;+AlternateLookup&lt;TAlternateKey&gt;" RefType="out" Index="0" FrameworkAlternate="net-9.0;net-10.0">
          <Attributes>
            <Attribute>
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(new System.Byte[] { 0, 0, 0, 1 })]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(new System.Byte[] { 0, 0, 0, 1 })&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <typeparam name="TAlternateKey">The alternate type of a key for performing lookups.</typeparam>
        <param name="lookup">The created lookup instance when the method returns <see langword="true" />, or a default instance that should not be used if the method returns <see langword="false" />.</param>
        <summary>
          Gets an instance of a type that may be used to perform operations on a <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />
          using a <typeparamref name="TAlternateKey" /> as a key instead of a <typeparamref name="TKey" />.
        </summary>
        <returns>
          <see langword="true" /> if a lookup could be created; otherwise, <see langword="false" />.</returns>
        <remarks>
          This instance must be using a comparer that implements <see cref="T:System.Collections.Generic.IAlternateEqualityComparer`2" /> with
          <typeparamref name="TAlternateKey" /> and <typeparamref name="TKey" />. If it doesn't, the method will return <see langword="false" />.
        </remarks>
      </Docs>
    </Member>
    <Member MemberName="TryGetValue">
      <MemberSignature Language="C#" Value="public bool TryGetValue (TKey key, out TValue value);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance bool TryGetValue(!TKey key, [out] !TValue&amp; value) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.TryGetValue(`0,`1@)" />
      <MemberSignature Language="VB.NET" Value="Public Function TryGetValue (key As TKey, ByRef value As TValue) As Boolean" />
      <MemberSignature Language="F#" Value="abstract member TryGetValue : 'Key * 'Value -&gt; bool&#xA;override this.TryGetValue : 'Key * 'Value -&gt; bool" Usage="concurrentDictionary.TryGetValue (key, value)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual bool TryGetValue(TKey key, [Runtime::InteropServices::Out] TValue % value);" />
      <MemberType>Method</MemberType>
      <Implements>
        <InterfaceMember>M:System.Collections.Generic.IDictionary`2.TryGetValue(`0,`1@)</InterfaceMember>
        <InterfaceMember FrameworkAlternate="dotnet-uwp-10.0;net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-1.3;netstandard-1.4;netstandard-1.6;netstandard-2.0;netstandard-2.1">M:System.Collections.Generic.IReadOnlyDictionary`2.TryGetValue(`0,`1@)</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
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        <AssemblyVersion>4.0.0.0</AssemblyVersion>
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      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
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      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="TKey" />
        <Parameter Name="value" Type="TValue" RefType="out">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1">
              <AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.MaybeNullWhen(false)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Diagnostics.CodeAnalysis.MaybeNullWhen(false)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="key">The key of the value to get.</param>
        <param name="value">When this method returns, contains the object from the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" /> that has the specified key, or the default value of the type if the operation failed.</param>
        <summary>Attempts to get the value associated with the specified key from the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</summary>
        <returns>
          <see langword="true" /> if the key was found in the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />; otherwise, <see langword="false" />.</returns>
        <remarks>To be added.</remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is  <see langword="null" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="TryRemove">
      <MemberSignature Language="C#" Value="public bool TryRemove (System.Collections.Generic.KeyValuePair&lt;TKey,TValue&gt; item);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool TryRemove(valuetype System.Collections.Generic.KeyValuePair`2&lt;!TKey, !TValue&gt; item) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.TryRemove(System.Collections.Generic.KeyValuePair{`0,`1})" />
      <MemberSignature Language="VB.NET" Value="Public Function TryRemove (item As KeyValuePair(Of TKey, TValue)) As Boolean" />
      <MemberSignature Language="F#" Value="member this.TryRemove : System.Collections.Generic.KeyValuePair&lt;'Key, 'Value&gt; -&gt; bool" Usage="concurrentDictionary.TryRemove item" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; bool TryRemove(System::Collections::Generic::KeyValuePair&lt;TKey, TValue&gt; item);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="item" Type="System.Collections.Generic.KeyValuePair&lt;TKey,TValue&gt;" Index="0" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;net-10.0">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-8.0;net-9.0">
              <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(new System.Byte[] { 0, 1, 1 })]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(new System.Byte[] { 0, 1, 1 })&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="item">The <see cref="T:System.Collections.Generic.KeyValuePair`2" /> representing the key and value to remove.</param>
        <summary>Removes a key and value from the dictionary.</summary>
        <returns>
          <see langword="true" /> if the key and value represented by <paramref name="item" /> are successfully found and removed; otherwise, <see langword="false" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

Both the specifed key and value must match the entry in the dictionary for it to be removed.

The key is compared using the dictionary's comparer (or the default comparer for `TKey` if no comparer was provided to the dictionary when it was constructed). The value is compared using the default comparer for `TValue`.

          ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">The <see cref="P:System.Collections.Generic.KeyValuePair`2.Key" /> property of <paramref name="item" /> is <see langword="null" />.</exception>
      </Docs>
    </Member>
    <Member MemberName="TryRemove">
      <MemberSignature Language="C#" Value="public bool TryRemove (TKey key, out TValue value);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool TryRemove(!TKey key, [out] !TValue&amp; value) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.TryRemove(`0,`1@)" />
      <MemberSignature Language="VB.NET" Value="Public Function TryRemove (key As TKey, ByRef value As TValue) As Boolean" />
      <MemberSignature Language="F#" Value="member this.TryRemove : 'Key * 'Value -&gt; bool" Usage="concurrentDictionary.TryRemove (key, value)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; bool TryRemove(TKey key, [Runtime::InteropServices::Out] TValue % value);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
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        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
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      <Parameters>
        <Parameter Name="key" Type="TKey" />
        <Parameter Name="value" Type="TValue" RefType="out">
          <Attributes>
            <Attribute FrameworkAlternate="net-10.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1">
              <AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.MaybeNullWhen(false)]</AttributeName>
              <AttributeName Language="F#">[&lt;System.Diagnostics.CodeAnalysis.MaybeNullWhen(false)&gt;]</AttributeName>
            </Attribute>
          </Attributes>
        </Parameter>
      </Parameters>
      <Docs>
        <param name="key">The key of the element to remove and return.</param>
        <param name="value">When this method returns, contains the object removed from the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />, or the default value of  the <see langword="TValue" /> type if <paramref name="key" /> does not exist.</param>
        <summary>Attempts to remove and return the value that has the specified key from the <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</summary>
        <returns>
          <see langword="true" /> if the object was removed successfully; otherwise, <see langword="false" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Examples
 The following example shows how to call the <xref:System.Collections.Concurrent.ConcurrentDictionary%602.TryRemove%2A?displayProperty=nameWithType> method:

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.cs" id="Snippet2":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.fs" id="Snippet2":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrent.concurrentdictionary/vb/concdictionary.vb" id="Snippet2":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is  <see langword="null" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="TryUpdate">
      <MemberSignature Language="C#" Value="public bool TryUpdate (TKey key, TValue newValue, TValue comparisonValue);" />
      <MemberSignature Language="ILAsm" Value=".method public hidebysig instance bool TryUpdate(!TKey key, !TValue newValue, !TValue comparisonValue) cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Collections.Concurrent.ConcurrentDictionary`2.TryUpdate(`0,`1,`1)" />
      <MemberSignature Language="VB.NET" Value="Public Function TryUpdate (key As TKey, newValue As TValue, comparisonValue As TValue) As Boolean" />
      <MemberSignature Language="F#" Value="member this.TryUpdate : 'Key * 'Value * 'Value -&gt; bool" Usage="concurrentDictionary.TryUpdate (key, newValue, comparisonValue)" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; bool TryUpdate(TKey key, TValue newValue, TValue comparisonValue);" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
        <AssemblyVersion>4.0.15.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Boolean</ReturnType>
      </ReturnValue>
      <Parameters>
        <Parameter Name="key" Type="TKey" />
        <Parameter Name="newValue" Type="TValue" />
        <Parameter Name="comparisonValue" Type="TValue" />
      </Parameters>
      <Docs>
        <param name="key">The key of the value that is compared with <paramref name="comparisonValue" /> and possibly replaced.</param>
        <param name="newValue">The value that replaces the value of the element that has the specified <paramref name="key" /> if the comparison results in equality.</param>
        <param name="comparisonValue">The value that is compared with the value of the element that has the specified <paramref name="key" />.</param>
        <summary>Updates the value associated with <paramref name="key" /> to <paramref name="newValue" /> if the existing value with <paramref name="key" /> is equal to <paramref name="comparisonValue" />.</summary>
        <returns>
          <see langword="true" /> if the value with <paramref name="key" /> was equal to <paramref name="comparisonValue" /> and was replaced with <paramref name="newValue" />; otherwise, <see langword="false" />.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Examples
 The following example shows how to call the <xref:System.Collections.Concurrent.ConcurrentDictionary%602.TryUpdate%2A> method:

 :::code language="csharp" source="~/snippets/csharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.cs" id="Snippet2":::
 :::code language="fsharp" source="~/snippets/fsharp/System.Collections.Concurrent/ConcurrentDictionaryTKey,TValue/Overview/concdictionary.fs" id="Snippet2":::
 :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.collections.concurrent.concurrentdictionary/vb/concdictionary.vb" id="Snippet2":::

 ]]></format>
        </remarks>
        <exception cref="T:System.ArgumentNullException">
          <paramref name="key" /> is <see langword="null" />.</exception>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
    <Member MemberName="Values">
      <MemberSignature Language="C#" Value="public System.Collections.Generic.ICollection&lt;TValue&gt; Values { get; }" />
      <MemberSignature Language="ILAsm" Value=".property instance class System.Collections.Generic.ICollection`1&lt;!TValue&gt; Values" />
      <MemberSignature Language="DocId" Value="P:System.Collections.Concurrent.ConcurrentDictionary`2.Values" />
      <MemberSignature Language="VB.NET" Value="Public ReadOnly Property Values As ICollection(Of TValue)" />
      <MemberSignature Language="F#" Value="member this.Values : System.Collections.Generic.ICollection&lt;'Value&gt;" Usage="System.Collections.Concurrent.ConcurrentDictionary&lt;'Key, 'Value&gt;.Values" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; property System::Collections::Generic::ICollection&lt;TValue&gt; ^ Values { System::Collections::Generic::ICollection&lt;TValue&gt; ^ get(); };" />
      <MemberType>Property</MemberType>
      <Implements>
        <InterfaceMember>P:System.Collections.Generic.IDictionary`2.Values</InterfaceMember>
      </Implements>
      <AssemblyInfo>
        <AssemblyName>System.Collections.Concurrent</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.0.10.0</AssemblyVersion>
        <AssemblyVersion>4.0.14.0</AssemblyVersion>
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        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Collections.Generic.ICollection&lt;TValue&gt;</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets a collection that contains the values in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</summary>
        <value>A collection that contains the values in the <see cref="T:System.Collections.Generic.Dictionary`2" />.</value>
        <remarks>The property returns a copy of all the values. It's not kept in sync with <see cref="T:System.Collections.Concurrent.ConcurrentDictionary`2" />.</remarks>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
        <related type="Article" href="/dotnet/standard/collections/thread-safe/how-to-add-and-remove-items">How to: Add and Remove Items from a ConcurrentDictionary</related>
      </Docs>
    </Member>
  </Members>
</Type>