Add ReadAllAsync polyfill for .NET Standard 2.0

Introduced ReadAllAsync extension for ChannelReader<T> as a polyfill for netstandard2.0, enabling async enumeration of channel data. Updated package version to 9.3.0 to reflect this addition.

Author: electricessence

Open.ChannelExtensions/Extensions.Read.cs

@@ -1074,4 +1074,25 @@ public static async ValueTask<List<T>> ToListAsync<T>(this ChannelReader<T> read
 		await ReadAll(reader, list.Add).ConfigureAwait(false);
 		return list;
 	}
+
+#if NETSTANDARD2_0
+	/// <summary>
+	/// Creates an <see cref="IAsyncEnumerable{T}"/> that enables reading all of the data from the channel.
+	/// </summary>
+	/// <remarks>Polyfill for netstandard2.0 where the built-in instance method is not available.</remarks>
+	public static async IAsyncEnumerable<T> ReadAllAsync<T>(
+		this ChannelReader<T> reader,
+		[EnumeratorCancellation] CancellationToken cancellationToken = default)
+	{
+		if (reader is null) throw new ArgumentNullException(nameof(reader));
+
+		while (await reader.WaitToReadAsync(cancellationToken).ConfigureAwait(false))
+		{
+			while (reader.TryRead(out T? item))
+			{
+				yield return item;
+			}
+		}
+	}
+#endif
 }

Open.ChannelExtensions/Open.ChannelExtensions.csproj

@@ -22,7 +22,7 @@
 		<RepositoryType>git</RepositoryType>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
-		<Version>9.2.0</Version>
+		<Version>9.3.0</Version>
 		<PackageReleaseNotes>Lowered .NET Standard 2.0/2.1 dependency versions to 6.0.0 to reduce minimum requirements for consumers.</PackageReleaseNotes>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>
 		<PublishRepositoryUrl>true</PublishRepositoryUrl>