Add IsConnected & KeepAlive extension method.

Author: seayxu

README.md

@@ -34,13 +34,13 @@ static void Main()
     {
         //get client data
         string message = server.Encoding.GetString(data, 0, data.Length);
-        Console.WriteLine($"server received data from {sender.RemoteEndPoint}£º{message}");
+        Console.WriteLine($"server received data from {sender.RemoteEndPoint}: {message}");
 
         //message = "server repley " + message;
         message = random.Next(100000000, 999999999).ToString();
         sender.Send(message);
 
-        Console.WriteLine($"server send data to {sender.RemoteEndPoint}£º{message}");
+        Console.WriteLine($"server send data to {sender.RemoteEndPoint}: {message}");
     };
 
     server.Listen();

build/version.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup Condition="'$(AssemblyName)'=='GodSharp.Socket'">
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>1.0.2-preview1</Version>
+    <Version>1.0.2-preview2</Version>
   </PropertyGroup>
 </Project>

src/GodSharp.Socket/Base/Sender.cs

@@ -6,6 +6,9 @@
 
 namespace GodSharp.Sockets
 {
+    /// <summary>
+    /// Socket sender.
+    /// </summary>
     public class Sender
     {
         private Listener listener;
@@ -38,7 +41,7 @@ public class Sender
         /// <summary>
         /// Initializes a new instance of the <see cref="Sender"/> class.
         /// </summary>
-        /// <param name="socket">The socket.</param>
+        /// <param name="listener">The <paramref name="listener"/>.</param>
         /// <param name="encoding">The encoding.</param>
         internal Sender(Listener listener,Encoding encoding)
         {

src/GodSharp.Socket/Base/SocketBase.cs

@@ -5,8 +5,14 @@
 
 namespace GodSharp.Sockets
 {
+    /// <summary>
+    /// Socket base class.
+    /// </summary>
     public abstract class SocketBase
     {
+        /// <summary>
+        /// The socket
+        /// </summary>
         protected internal Socket socket = null;
 
         /// <summary>

src/GodSharp.Socket/Extension/SocketClient.Extension.cs

@@ -0,0 +1,56 @@
+using GodSharp.Sockets.Internal.Extension;
+using System;
+using System.Net.Sockets;
+
+namespace GodSharp.Sockets
+{
+    /// <summary>
+    /// Extension class.
+    /// </summary>
+    public static class Extensions
+    {
+        /// <summary>
+        /// Determines whether this instance is connected.
+        /// </summary>
+        /// <param name="client">The client.</param>
+        /// <returns>
+        ///   <c>true</c> if the specified client is connected; otherwise, <c>false</c>.
+        /// </returns>
+        public static bool IsConnected(this SocketBase client)
+        {
+            return client.socket.IsConnected();
+        }
+
+        /// <summary>
+        /// Set <see cref="SocketClient"/> keep-alive option.
+        /// </summary>
+        /// <param name="client">The socket client.</param>
+        /// <param name="on">if set to <c>true</c> [on].</param>
+        /// <param name="time">The time.</param>
+        /// <param name="interval">The interval.</param>
+        /// <returns>return <see cref="bool"/> value of KeepAlive value.</returns>
+        public static bool KeepAlive(this SocketBase client, bool on = true, uint time = 5000, uint interval = 5000)
+        {
+            try
+            {
+                byte[] inOptionValues = new byte[12];
+
+                uint off = (uint)(on ? 1 : 0);
+
+                BitConverter.GetBytes(off).CopyTo(inOptionValues, 0);
+                BitConverter.GetBytes(interval).CopyTo(inOptionValues, 4);
+                BitConverter.GetBytes(interval).CopyTo(inOptionValues, 8);
+
+                client.socket.IOControl(IOControlCode.KeepAliveValues, inOptionValues, null);
+
+                object obj = client.socket.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive);
+
+                return Convert.ToInt32(obj) == 1;
+            }
+            catch (Exception ex)
+            {
+                throw ex;
+            }
+        }
+    }
+}

src/GodSharp.Socket/GodSharp.Socket.csproj

@@ -39,6 +39,15 @@
   <PropertyGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
     <DefineConstants>NETSTANDARD2_0;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
+  <ItemGroup>
+    <Compile Remove="Object\**" />
+    <EmbeddedResource Remove="Object\**" />
+    <None Remove="Object\**" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Remove="Base\SenderCollection.cs" />
+    <Compile Remove="Internal\Listener\ListenerCollection.cs" />
+  </ItemGroup>
 
   <Import Project="..\..\build\version.props" />
 </Project>

src/GodSharp.Socket/Internal/Extension/SocketExtension.cs

@@ -9,6 +9,7 @@ internal static class SocketExtension
         /// <summary>
         /// Sends data to a connected <see cref="Socket"/>.
         /// </summary>
+        /// <param name="socket">The socket.</param>
         /// <param name="data">An string of type <see cref="string" /> that contains the data to be sent.</param>
         /// <param name="encoding">The <see cref="Encoding"/> for data.</param>
         /// <returns>The number of bytes sent to the <see cref="Socket"/>.</returns>
@@ -21,6 +22,7 @@ public static int Send(this Socket socket, string data, Encoding encoding)
         /// <summary>
         /// Sends data to a connected <see cref="Socket" /> using the specified <see cref="SocketFlags" />.
         /// </summary>
+        /// <param name="socket">The socket.</param>
         /// <param name="data">An string of type <see cref="string" /> that contains the data to be sent.</param>
         /// <param name="socketFlags">A bitwise combination of the <see cref="SocketFlags" /> values.</param>
         /// <param name="encoding">The <see cref="Encoding"/> for data.</param>
@@ -30,10 +32,11 @@ public static int Send(this Socket socket, string data, SocketFlags socketFlags,
             byte[] buffers = encoding.GetBytes(data);
             return socket.Send(buffers, socketFlags);
         }
-        
+
         /// <summary>
         ///  Sends the specified number of bytes of data to a connected <see cref="Socket" />, starting at the specified offset, and using the specified <see cref="SocketFlags" />.
         /// </summary>
+        /// <param name="socket">The socket.</param>
         /// <param name="data">An string of type <see cref="string" /> that contains the data to be sent.</param>
         /// <param name="socketFlags">A bitwise combination of the <see cref="SocketFlags" /> values.</param>
         /// <param name="socketError">A <see cref="SocketError" /> object that stores the socket error.</param>

src/GodSharp.Socket/Internal/Listener/Listener.cs

@@ -71,10 +71,9 @@ internal class Listener
         /// <summary>
         /// Initializes a new instance of the <see cref="Listener"/> class.
         /// </summary>
+        /// <param name="_base">The base.</param>
         /// <param name="socket">The socket.</param>
-        /// <param name="onData">The on data.</param>
-        /// <param name="onException">The on exception.</param>
-        /// <param name="onClosed">The on closed.</param>
+        /// <param name="type">The type.</param>
         internal Listener(SocketBase _base,Socket socket, ListenerType type)
         {
             parent = _base;

src/GodSharp.Socket/Internal/Util/Utils.cs

@@ -5,6 +5,9 @@
 
 namespace GodSharp.Sockets.Internal.Util
 {
+    /// <summary>
+    /// Socket utils.
+    /// </summary>
     public class Utils
     {
         /// <summary>
@@ -47,6 +50,11 @@ internal static Exception ValidateHost(string host)
             }
         }
 
+        /// <summary>
+        /// MD5s the specified string.
+        /// </summary>
+        /// <param name="str">The string.</param>
+        /// <returns></returns>
         internal static byte[] Md5(string str)
         {
             if (string.IsNullOrEmpty(str) || str.Trim() == "")

src/GodSharp.Socket/Object/KeepAliveOptions.cs

@@ -1,5 +1,8 @@
 namespace GodSharp.Sockets
 {
+    /// <summary>
+    /// 
+    /// </summary>
     public class KeepAliveOptions
     {
         /// <summary>