C#高性能Socket服務器IOCP實現

引言
我一直在探尋一個高性能的Socket客戶端代碼。之前，我使用Socket類寫了一些基於傳統異步編程模型的代碼（BeginSend、BeginReceive，等等）也看過不少博客的知識，在linux中有poll和epoll來實現，在windows下面
微軟MSDN中也提供了SocketAsyncEventArgs這個類來實現IOCP 地址:https://msdn.microsoft.com/zh-cn/library/system.net.sockets.socketasynceventargs.aspx
NET Framework中的APM也稱爲Begin/End模式。這是由於會調用Begin方法來啓動異步操做，而後返回一個IAsyncResult 對象。能夠選擇將一個代理做爲參數提供給Begin方法，異步操做完成時會調用該方法。或者，一個線程能夠等待 IAsyncResult.AsyncWaitHandle。當回調被調用或發出等待信號時，就會調用End方法來獲取異步操做的結果。這種模式很靈活，使用相對簡單，在 .NET Framework 中很是常見。
可是，您必須注意，若是進行大量異步套接字操做，是要付出代價的。針對每次操做，都必須建立一個IAsyncResult對象，並且該對象不能被重複使用。因爲大量使用對象分配和垃圾收集，這會影響性能。爲了解決這個問題，新版本提供了另外一個使用套接字上執行異步I/O的方法模式。這種新模式並不要求爲每一個套接字操做分配操做上下文對象。

代碼下載：http://download.csdn.net/detail/zhujunxxxxx/8431289 這裏的代碼優化了的
目標
在上面微軟提供的例子我以爲不是很完整，沒有具體一個流程，只是受到客戶端消息後發送相同內容給客戶端，初學者不容易看懂流程，由於我花了一天的時間來實現一個功能齊全的IOCP服務器，

效果以下

 

代碼

首先是ICOPServer.cs 這個類是IOCP服務器的核心類，目前這個類是網絡上比較全的代碼，MSDN上面的例子都沒有個人全

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace ServerTest
{
    /// <summary>
    /// IOCP SOCKET服務器
    /// </summary>
    public class IOCPServer : IDisposable
    {
        const int opsToPreAlloc = 2;
        #region Fields
        /// <summary>
        /// 服務器程序容許的最大客戶端鏈接數
        /// </summary>
        private int _maxClient;

        /// <summary>
        /// 監聽Socket，用於接受客戶端的鏈接請求
        /// </summary>
        private Socket _serverSock;

        /// <summary>
        /// 當前的鏈接的客戶端數
        /// </summary>
        private int _clientCount;

        /// <summary>
        /// 用於每一個I/O Socket操做的緩衝區大小
        /// </summary>
        private int _bufferSize = 1024;

        /// <summary>
        /// 信號量
        /// </summary>
        Semaphore _maxAcceptedClients;

        /// <summary>
        /// 緩衝區管理
        /// </summary>
        BufferManager _bufferManager;

        /// <summary>
        /// 對象池
        /// </summary>
        SocketAsyncEventArgsPool _objectPool;

        private bool disposed = false;

        #endregion

        #region Properties

        /// <summary>
        /// 服務器是否正在運行
        /// </summary>
        public bool IsRunning { get; private set; }
        /// <summary>
        /// 監聽的IP地址
        /// </summary>
        public IPAddress Address { get; private set; }
        /// <summary>
        /// 監聽的端口
        /// </summary>
        public int Port { get; private set; }
        /// <summary>
        /// 通訊使用的編碼
        /// </summary>
        public Encoding Encoding { get; set; }

        #endregion

        #region Ctors

        /// <summary>
        /// 異步IOCP SOCKET服務器
        /// </summary>
        /// <param name="listenPort">監聽的端口</param>
        /// <param name="maxClient">最大的客戶端數量</param>
        public IOCPServer(int listenPort, int maxClient)
        : this(IPAddress.Any, listenPort, maxClient)
        {
        }

        /// <summary>
        /// 異步Socket TCP服務器
        /// </summary>
        /// <param name="localEP">監聽的終結點</param>
        /// <param name="maxClient">最大客戶端數量</param>
        public IOCPServer(IPEndPoint localEP, int maxClient)
        : this(localEP.Address, localEP.Port, maxClient)
        {
        }

        /// <summary>
        /// 異步Socket TCP服務器
        /// </summary>
        /// <param name="localIPAddress">監聽的IP地址</param>
        /// <param name="listenPort">監聽的端口</param>
        /// <param name="maxClient">最大客戶端數量</param>
        public IOCPServer(IPAddress localIPAddress, int listenPort, int maxClient)
        {
            this.Address = localIPAddress;
            this.Port = listenPort;
            this.Encoding = Encoding.Default;

            _maxClient = maxClient;

            _serverSock = new Socket(localIPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

            _bufferManager = new BufferManager(_bufferSize * _maxClient * opsToPreAlloc, _bufferSize);

            _objectPool = new SocketAsyncEventArgsPool(_maxClient);

            _maxAcceptedClients = new Semaphore(_maxClient, _maxClient);
        }

        #endregion


        #region 初始化

        /// <summary>
        /// 初始化函數
        /// </summary>
        public void Init()
        {
            // Allocates one large byte buffer which all I/O operations use a piece of. This gaurds 
            // against memory fragmentation
            _bufferManager.InitBuffer();

            // preallocate pool of SocketAsyncEventArgs objects
            SocketAsyncEventArgs readWriteEventArg;

            for (int i = 0; i < _maxClient; i++)
            {
                //Pre-allocate a set of reusable SocketAsyncEventArgs
                readWriteEventArg = new SocketAsyncEventArgs();
                readWriteEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(OnIOCompleted);
                readWriteEventArg.UserToken = null;

                // assign a byte buffer from the buffer pool to the SocketAsyncEventArg object
                _bufferManager.SetBuffer(readWriteEventArg);

                // add SocketAsyncEventArg to the pool
                _objectPool.Push(readWriteEventArg);
            }

        }

        #endregion

        #region Start
        /// <summary>
        /// 啓動
        /// </summary>
        public void Start()
        {
            if (!IsRunning)
            {
                Init();
                IsRunning = true;
                IPEndPoint localEndPoint = new IPEndPoint(Address, Port);
                // 建立監聽socket
                _serverSock = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
                //_serverSock.ReceiveBufferSize = _bufferSize;
                //_serverSock.SendBufferSize = _bufferSize;
                if (localEndPoint.AddressFamily == AddressFamily.InterNetworkV6)
                {
                    // 配置監聽socket爲 dual-mode (IPv4 & IPv6) 
                    // 27 is equivalent to IPV6_V6ONLY socket option in the winsock snippet below,
                    _serverSock.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, false);
                    _serverSock.Bind(new IPEndPoint(IPAddress.IPv6Any, localEndPoint.Port));
                }
                else
                {
                    _serverSock.Bind(localEndPoint);
                }
                // 開始監聽
                _serverSock.Listen(this._maxClient);
                // 在監聽Socket上投遞一個接受請求。
                StartAccept(null);
            }
        }
        #endregion

        #region Stop

        /// <summary>
        /// 中止服務
        /// </summary>
        public void Stop()
        {
            if (IsRunning)
            {
                IsRunning = false;
                _serverSock.Close();
                //TODO 關閉對全部客戶端的鏈接

            }
        }

        #endregion


        #region Accept

        /// <summary>
        /// 從客戶端開始接受一個鏈接操做
        /// </summary>
        private void StartAccept(SocketAsyncEventArgs asyniar)
        {
            if (asyniar == null)
            {
                asyniar = new SocketAsyncEventArgs();
                asyniar.Completed += new EventHandler<SocketAsyncEventArgs>(OnAcceptCompleted);
            }
            else
            {
                //socket must be cleared since the context object is being reused
                asyniar.AcceptSocket = null;
            }
            _maxAcceptedClients.WaitOne();
            if (!_serverSock.AcceptAsync(asyniar))
            {
                ProcessAccept(asyniar);
                //若是I/O掛起等待異步則觸發AcceptAsyn_Asyn_Completed事件
                //此時I/O操做同步完成，不會觸發Asyn_Completed事件，因此指定BeginAccept()方法
            }
        }

        /// <summary>
        /// accept 操做完成時回調函數
        /// </summary>
        /// <param name="sender">Object who raised the event.</param>
        /// <param name="e">SocketAsyncEventArg associated with the completed accept operation.</param>
        private void OnAcceptCompleted(object sender, SocketAsyncEventArgs e)
        {
            ProcessAccept(e);
        }

        /// <summary>
        /// 監聽Socket接受處理
        /// </summary>
        /// <param name="e">SocketAsyncEventArg associated with the completed accept operation.</param>
        private void ProcessAccept(SocketAsyncEventArgs e)
        {
            if (e.SocketError == SocketError.Success)
            {
                Socket s = e.AcceptSocket;//和客戶端關聯的socket
                if (s.Connected)
                {
                    try
                    {

                        Interlocked.Increment(ref _clientCount);//原子操做加1
                        SocketAsyncEventArgs asyniar = _objectPool.Pop();
                        asyniar.UserToken = s;

                        Log4Debug(String.Format("客戶 {0} 連入, 共有 {1} 個鏈接。", s.RemoteEndPoint.ToString(), _clientCount));

                        if (!s.ReceiveAsync(asyniar))//投遞接收請求
                        {
                            ProcessReceive(asyniar);
                        }
                    }
                    catch (SocketException ex)
                    {
                        Log4Debug(String.Format("接收客戶 {0} 數據出錯, 異常信息： {1} 。", s.RemoteEndPoint, ex.ToString()));
                        //TODO 異常處理
                    }
                    //投遞下一個接受請求
                    StartAccept(e);
                }
            }
        }

        #endregion

        #region 發送數據

        /// <summary>
        /// 異步的發送數據
        /// </summary>
        /// <param name="e"></param>
        /// <param name="data"></param>
        public void Send(SocketAsyncEventArgs e, byte[] data)
        {
            if (e.SocketError == SocketError.Success)
            {
                Socket s = e.AcceptSocket;//和客戶端關聯的socket
                if (s.Connected)
                {
                    Array.Copy(data, 0, e.Buffer, 0, data.Length);//設置發送數據

                    //e.SetBuffer(data, 0, data.Length); //設置發送數據
                    if (!s.SendAsync(e))//投遞發送請求，這個函數有可能同步發送出去，這時返回false，而且不會引起SocketAsyncEventArgs.Completed事件
                    {
                        // 同步發送時處理髮送完成事件
                        ProcessSend(e);
                    }
                    else
                    {
                        CloseClientSocket(e);
                    }
                }
            }
        }

        /// <summary>
        /// 同步的使用socket發送數據
        /// </summary>
        /// <param name="socket"></param>
        /// <param name="buffer"></param>
        /// <param name="offset"></param>
        /// <param name="size"></param>
        /// <param name="timeout"></param>
        public void Send(Socket socket, byte[] buffer, int offset, int size, int timeout)
        {
            socket.SendTimeout = 0;
            int startTickCount = Environment.TickCount;
            int sent = 0; // how many bytes is already sent
            do
            {
                if (Environment.TickCount > startTickCount + timeout)
                {
                    //throw new Exception("Timeout.");
                }
                try
                {
                    sent += socket.Send(buffer, offset + sent, size - sent, SocketFlags.None);
                }
                catch (SocketException ex)
                {
                    if (ex.SocketErrorCode == SocketError.WouldBlock ||
                    ex.SocketErrorCode == SocketError.IOPending ||
                    ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
                    {
                        // socket buffer is probably full, wait and try again
                        Thread.Sleep(30);
                    }
                    else
                    {
                        throw ex; // any serious error occurr
                    }
                }
            } while (sent < size);
        }


        /// <summary>
        /// 發送完成時處理函數
        /// </summary>
        /// <param name="e">與發送完成操做相關聯的SocketAsyncEventArg對象</param>
        private void ProcessSend(SocketAsyncEventArgs e)
        {
            if (e.SocketError == SocketError.Success)
            {
                Socket s = (Socket)e.UserToken;

                //TODO
            }
            else
            {
                CloseClientSocket(e);
            }
        }

        #endregion

        #region 接收數據


        /// <summary>
        ///接收完成時處理函數
        /// </summary>
        /// <param name="e">與接收完成操做相關聯的SocketAsyncEventArg對象</param>
        private void ProcessReceive(SocketAsyncEventArgs e)
        {
            if (e.SocketError == SocketError.Success)//if (e.BytesTransferred > 0 && e.SocketError == SocketError.Success)
            {
                // 檢查遠程主機是否關閉鏈接
                if (e.BytesTransferred > 0)
                {
                    Socket s = (Socket)e.UserToken;
                    //判斷全部需接收的數據是否已經完成
                    if (s.Available == 0)
                    {
                        //從偵聽者獲取接收到的消息。 
                        //String received = Encoding.ASCII.GetString(e.Buffer, e.Offset, e.BytesTransferred);
                        //echo the data received back to the client
                        //e.SetBuffer(e.Offset, e.BytesTransferred);

                        byte[] data = new byte[e.BytesTransferred];
                        Array.Copy(e.Buffer, e.Offset, data, 0, data.Length);//從e.Buffer塊中複製數據出來，保證它可重用

                        string info = Encoding.Default.GetString(data);
                        Log4Debug(String.Format("收到 {0} 數據爲 {1}", s.RemoteEndPoint.ToString(), info));
                        //TODO 處理數據

                        //增長服務器接收的總字節數。
                    }

                    if (!s.ReceiveAsync(e))//爲接收下一段數據，投遞接收請求，這個函數有可能同步完成，這時返回false，而且不會引起SocketAsyncEventArgs.Completed事件
                    {
                        //同步接收時處理接收完成事件
                        ProcessReceive(e);
                    }
                }
            }
            else
            {
                CloseClientSocket(e);
            }
        }

        #endregion

        #region 回調函數

        /// <summary>
        /// 當Socket上的發送或接收請求被完成時，調用此函數
        /// </summary>
        /// <param name="sender">激發事件的對象</param>
        /// <param name="e">與發送或接收完成操做相關聯的SocketAsyncEventArg對象</param>
        private void OnIOCompleted(object sender, SocketAsyncEventArgs e)
        {
            // Determine which type of operation just completed and call the associated handler.
            switch (e.LastOperation)
            {
                case SocketAsyncOperation.Accept:
                    ProcessAccept(e);
                    break;
                case SocketAsyncOperation.Receive:
                    ProcessReceive(e);
                    break;
                default:
                    throw new ArgumentException("The last operation completed on the socket was not a receive or send");
            }
        }

        #endregion

        #region Close
        /// <summary>
        /// 關閉socket鏈接
        /// </summary>
        /// <param name="e">SocketAsyncEventArg associated with the completed send/receive operation.</param>
        private void CloseClientSocket(SocketAsyncEventArgs e)
        {
            Log4Debug(String.Format("客戶 {0} 斷開鏈接!", ((Socket)e.UserToken).RemoteEndPoint.ToString()));
            Socket s = e.UserToken as Socket;
            CloseClientSocket(s, e);
        }

        /// <summary>
        /// 關閉socket鏈接
        /// </summary>
        /// <param name="s"></param>
        /// <param name="e"></param>
        private void CloseClientSocket(Socket s, SocketAsyncEventArgs e)
        {
            try
            {
                s.Shutdown(SocketShutdown.Send);
            }
            catch (Exception)
            {
                // Throw if client has closed, so it is not necessary to catch.
            }
            finally
            {
                s.Close();
            }
            Interlocked.Decrement(ref _clientCount);
            _maxAcceptedClients.Release();
            _objectPool.Push(e);//SocketAsyncEventArg 對象被釋放，壓入可重用隊列。
        }
        #endregion

        #region Dispose
        /// <summary>
        /// Performs application-defined tasks associated with freeing, 
        /// releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources
        /// </summary>
        /// <param name="disposing"><c>true</c> to release 
        /// both managed and unmanaged resources; <c>false</c> 
        /// to release only unmanaged resources.</param>
        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    try
                    {
                        Stop();
                        if (_serverSock != null)
                        {
                            _serverSock = null;
                        }
                    }
                    catch (SocketException ex)
                    {
                        //TODO 事件
                    }
                }
                disposed = true;
            }
        }
        #endregion

        public void Log4Debug(string msg)
        {
            Console.WriteLine("notice:" + msg);
        }

    }
}

 

BufferManager.cs 這個類是緩存管理類，是採用MSDN上面的例子同樣的 地址: https://msdn.microsoft.com/zh-cn/library/bb517542.aspx

SocketAsyncEventArgsPool.cs 這個類也是來自MSDN的 地址:https://msdn.microsoft.com/zh-cn/library/system.net.sockets.socketasynceventargs.aspx

須要的話本身到MSDN網站上去取，我就不貼出來了

服務器端

static void Main(string[] args)
{

    IOCPServer server = new IOCPServer(8088, 1024);
    server.Start();
    Console.WriteLine("服務器已啓動....");
    System.Console.ReadLine();
}

 

客戶端

客戶端代碼也是很簡單

static void Main(string[] args)
{
    IPAddress remote = IPAddress.Parse("192.168.3.4");
    client c = new client(8088, remote);

    c.connect();
    Console.WriteLine("服務器鏈接成功!");
    while (true)
    {
        Console.Write("send>");
        string msg = Console.ReadLine();
        if (msg == "exit")
            break;
        c.send(msg);
    }
    c.disconnect();
    Console.ReadLine();
}

 

client.cs

public class client
{

    public TcpClient _client;

    public int port;

    public IPAddress remote;

    public client(int port, IPAddress remote)
    {

        this.port = port;
        this.remote = remote;
    }

    public void connect()
    {
        this._client = new TcpClient();
        _client.Connect(remote, port);
    }
    public void disconnect()
    {
        _client.Close();
    }
    public void send(string msg)
    {
        byte[] data = Encoding.Default.GetBytes(msg);
        _client.GetStream().Write(data, 0, data.Length);
    }
}

 

IOCPClient類，使用SocketAsyncEventArgs類創建一個Socket客戶端。雖然MSDN說這個類特別設計給網絡服務器應用，但也沒有限制在客戶端代碼中使用APM。下面給出了IOCPClient類的樣例代碼：

public class IOCPClient
{
    /// <summary>
    /// 鏈接服務器的socket
    /// </summary>
    private Socket _clientSock;

    /// <summary>
    /// 用於服務器執行的互斥同步對象
    /// </summary>
    private static Mutex mutex = new Mutex();
    /// <summary>
    /// Socket鏈接標誌
    /// </summary>
    private Boolean _connected = false;

    private const int ReceiveOperation = 1, SendOperation = 0;

    private static AutoResetEvent[]
    autoSendReceiveEvents = new AutoResetEvent[]
    {
new AutoResetEvent(false),
new AutoResetEvent(false)
    };

    /// <summary>
    /// 服務器監聽端點
    /// </summary>
    private IPEndPoint _remoteEndPoint;

    public IOCPClient(IPEndPoint local, IPEndPoint remote)
    {
        _clientSock = new Socket(local.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
        _remoteEndPoint = remote;
    }

    #region 鏈接服務器

    /// <summary>
    /// 鏈接遠程服務器
    /// </summary>
    public void Connect()
    {
        SocketAsyncEventArgs connectArgs = new SocketAsyncEventArgs();

        connectArgs.UserToken = _clientSock;
        connectArgs.RemoteEndPoint = _remoteEndPoint;
        connectArgs.Completed += new EventHandler<SocketAsyncEventArgs>(OnConnected);
        mutex.WaitOne();
        if (!_clientSock.ConnectAsync(connectArgs))//異步鏈接
        {
            ProcessConnected(connectArgs);
        }

    }
    /// <summary>
    /// 鏈接上的事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void OnConnected(object sender, SocketAsyncEventArgs e)
    {
        mutex.ReleaseMutex();
        //設置Socket已鏈接標誌。 
        _connected = (e.SocketError == SocketError.Success);
    }
    /// <summary>
    /// 處理鏈接服務器
    /// </summary>
    /// <param name="e"></param>
    private void ProcessConnected(SocketAsyncEventArgs e)
    {
        //TODO
    }

    #endregion

    #region 發送消息
    /// <summary>
    /// 向服務器發送消息
    /// </summary>
    /// <param name="data"></param>
    public void Send(byte[] data)
    {
        SocketAsyncEventArgs asyniar = new SocketAsyncEventArgs();
        asyniar.Completed += new EventHandler<SocketAsyncEventArgs>(OnSendComplete);
        asyniar.SetBuffer(data, 0, data.Length);
        asyniar.UserToken = _clientSock;
        asyniar.RemoteEndPoint = _remoteEndPoint;
        autoSendReceiveEvents[SendOperation].WaitOne();
        if (!_clientSock.SendAsync(asyniar))//投遞發送請求，這個函數有可能同步發送出去，這時返回false，而且不會引起SocketAsyncEventArgs.Completed事件
        {
            // 同步發送時處理髮送完成事件
            ProcessSend(asyniar);
        }
    }

    /// <summary>
    /// 發送操做的回調方法
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnSendComplete(object sender, SocketAsyncEventArgs e)
    {
        //發出發送完成信號。 
        autoSendReceiveEvents[SendOperation].Set();
        ProcessSend(e);
    }

    /// <summary>
    /// 發送完成時處理函數
    /// </summary>
    /// <param name="e">與發送完成操做相關聯的SocketAsyncEventArg對象</param>
    private void ProcessSend(SocketAsyncEventArgs e)
    {
        //TODO
    }
    #endregion

    #region 接收消息
    /// <summary>
    /// 開始監聽服務端數據
    /// </summary>
    /// <param name="e"></param>
    public void StartRecive(SocketAsyncEventArgs e)
    {
        //準備接收。 
        Socket s = e.UserToken as Socket;
        byte[] receiveBuffer = new byte[255];
        e.SetBuffer(receiveBuffer, 0, receiveBuffer.Length);
        e.Completed += new EventHandler<SocketAsyncEventArgs>(OnReceiveComplete);
        autoSendReceiveEvents[ReceiveOperation].WaitOne();
        if (!s.ReceiveAsync(e))
        {
            ProcessReceive(e);
        }
    }

    /// <summary>
    /// 接收操做的回調方法
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnReceiveComplete(object sender, SocketAsyncEventArgs e)
    {
        //發出接收完成信號。 
        autoSendReceiveEvents[ReceiveOperation].Set();
        ProcessReceive(e);
    }

    /// <summary>
    ///接收完成時處理函數
    /// </summary>
    /// <param name="e">與接收完成操做相關聯的SocketAsyncEventArg對象</param>
    private void ProcessReceive(SocketAsyncEventArgs e)
    {
        if (e.SocketError == SocketError.Success)
        {
            // 檢查遠程主機是否關閉鏈接
            if (e.BytesTransferred > 0)
            {
                Socket s = (Socket)e.UserToken;
                //判斷全部需接收的數據是否已經完成
                if (s.Available == 0)
                {
                    byte[] data = new byte[e.BytesTransferred];
                    Array.Copy(e.Buffer, e.Offset, data, 0, data.Length);//從e.Buffer塊中複製數據出來，保證它可重用

                    //TODO 處理數據
                }

                if (!s.ReceiveAsync(e))//爲接收下一段數據，投遞接收請求，這個函數有可能同步完成，這時返回false，而且不會引起SocketAsyncEventArgs.Completed事件
                {
                    //同步接收時處理接收完成事件
                    ProcessReceive(e);
                }
            }
        }
    }

    #endregion


    public void Close()
    {
        _clientSock.Disconnect(false);
    }

    /// <summary>
    /// 失敗時關閉Socket，根據SocketError拋出異常。
    /// </summary>
    /// <param name="e"></param>

    private void ProcessError(SocketAsyncEventArgs e)
    {
        Socket s = e.UserToken as Socket;
        if (s.Connected)
        {
            //關閉與客戶端關聯的Socket
            try
            {
                s.Shutdown(SocketShutdown.Both);
            }
            catch (Exception)
            {
                //若是客戶端處理已經關閉，拋出異常 
            }
            finally
            {
                if (s.Connected)
                {
                    s.Close();
                }
            }
        }
        //拋出SocketException 
        throw new SocketException((Int32)e.SocketError);
    }


    /// <summary>
    /// 釋放SocketClient實例
    /// </summary>
    public void Dispose()
    {
        mutex.Close();
        autoSendReceiveEvents[SendOperation].Close();
        autoSendReceiveEvents[ReceiveOperation].Close();
        if (_clientSock.Connected)
        {
            _clientSock.Close();
        }
    }

}

 

原文地址:http://blog.csdn.net/zhujunxxxxx/article/details/43573879

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源碼是Apache License 2.0協議，能夠放心商用。