c#异步Socket Tcp服务器实现
使用的是TcpListener来实现的异步服务器
代码
服务器核心代码 AsyncServer.cs
/// <summary> /// 异步SOCKET 服务器 /// </summary> public class AsyncServer : IDisposable { #region Fields /// <summary> /// 服务器程序允许的最大客户端连接数 /// </summary> private int _maxClient; /// <summary> /// 当前的连接的客户端数 /// </summary> private int _clientCount; /// <summary> /// 服务器使用的异步socket /// </summary> private Socket _serverSock; /// <summary> /// 客户端会话列表 /// </summary> private List<Session> _clients; private bool disposed = false; #endregion #region Properties /// <summary> /// 服务器是否正在运行 /// </summary> public bool IsRunning { get; private set; } /// <summary> /// 监听的IP地址 /// </summary> public IPAddress Address { get; private set; } /// <summary> /// 监听的端口 /// </summary> public int Port { get; private set; } /// <summary> /// 通信使用的编码 /// </summary> public Encoding Encoding { get; set; } #endregion #region Ctors /// <summary> /// 异步Socket TCP服务器 /// </summary> /// <param name="listenPort">监听的端口</param> public AsyncServer(int listenPort) : this(IPAddress.Any, listenPort,1024) { } /// <summary> /// 异步Socket TCP服务器 /// </summary> /// <param name="localEP">监听的终结点</param> public AsyncServer(IPEndPoint localEP) : this(localEP.Address, localEP.Port,1024) { } /// <summary> /// 异步Socket TCP服务器 /// </summary> /// <param name="localIPAddress">监听的IP地址</param> /// <param name="listenPort">监听的端口</param> /// <param name="maxClient">最大客户端数量</param> public AsyncServer(IPAddress localIPAddress, int listenPort,int maxClient) { this.Address = localIPAddress; this.Port = listenPort; this.Encoding = Encoding.Default; _maxClient = maxClient; _clients = new List<Session>(); _serverSock = new Socket(localIPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp); } #endregion #region Server /// <summary> /// 启动服务器 /// </summary> /// <returns>异步TCP服务器</returns> public AsyncServer Start() { if (!IsRunning) { IsRunning = true; _serverSock.Bind(new IPEndPoint(this.Address, this.Port)); _serverSock.Listen(1024); _serverSock.BeginAccept(new AsyncCallback(HandleAcceptConnected), _serverSock); } return this; } /// <summary> /// 启动服务器 /// </summary> /// <param name="backlog"> /// 服务器所允许的挂起连接序列的最大长度 /// </param> /// <returns>异步TCP服务器</returns> public AsyncServer Start(int backlog) { if (!IsRunning) { IsRunning = true; _serverSock.Bind(new IPEndPoint(this.Address, this.Port)); _serverSock.Listen(backlog); _serverSock.BeginAccept(new AsyncCallback(HandleAcceptConnected), _serverSock); } return this; } /// <summary> /// 停止服务器 /// </summary> /// <returns>异步TCP服务器</returns> public AsyncServer Stop() { if (IsRunning) { IsRunning = false; _serverSock.Close(); //TODO 关闭对所有客户端的连接 } return this; } #endregion #region Receive /// <summary> /// 处理客户端连接 /// </summary> /// <param name="ar"></param> private void HandleAcceptConnected(IAsyncResult ar) { if (IsRunning) { Socket server = (Socket)ar.AsyncState; Socket client = server.EndAccept(ar); //检查是否达到最大的允许的客户端数目 if (_clientCount == _maxClient) { //TODO 触发事件 RaiseServerException(null); } else { Session session = new Session(client); lock (_clients) { _clients.Add(session); _clientCount++; RaiseClientConnected(session); //触发客户端连接事件 } session.RecvDataBuffer = new byte[client.ReceiveBufferSize]; //开始接受来自该客户端的数据 client.BeginReceive(session.RecvDataBuffer, 0, session.RecvDataBuffer.Length, SocketFlags.None, new AsyncCallback(HandleDataReceived), session); } //接受下一个请求 server.BeginAccept(new AsyncCallback(HandleAcceptConnected), ar.AsyncState); } } /// <summary> /// 处理客户端数据 /// </summary> /// <param name="ar"></param> private void HandleDataReceived(IAsyncResult ar) { if (IsRunning) { Session session = (Session)ar.AsyncState; Socket client = session.ClientSocket; try { //如果两次开始了异步的接收,所以当客户端退出的时候 //会两次执行EndReceive int recv = client.EndReceive(ar); if (recv == 0) { //TODO 触发事件 (关闭客户端) CloseSession(session); RaiseNetError(session); return; } //TODO 处理已经读取的数据 ps:数据在session的RecvDataBuffer中 RaiseDataReceived(session); //TODO 触发数据接收事件 } catch (SocketException ex) { //TODO 异常处理 RaiseNetError(session); } finally { //继续接收来自来客户端的数据 client.BeginReceive(session.RecvDataBuffer, 0, session.RecvDataBuffer.Length, SocketFlags.None, new AsyncCallback(HandleDataReceived), session); } } } #endregion #region Send /// <summary> /// 发送数据 /// </summary> /// <param name="session">接收数据的客户端会话</param> /// <param name="data">数据报文</param> public void Send(Session session, byte[] data) { Send(session.ClientSocket,data); } /// <summary> /// 异步发送数据至指定的客户端 /// </summary> /// <param name="client">客户端</param> /// <param name="data">报文</param> public void Send(Socket client, byte[] data) { if (!IsRunning) throw new InvalidProgramException("This TCP Scoket server has not been started."); if (client == null) throw new ArgumentNullException("client"); if (data == null) throw new ArgumentNullException("data"); client.BeginSend(data, 0, data.Length, SocketFlags.None, new AsyncCallback(SendDataEnd), client); } /// <summary> /// 发送数据完成处理函数 /// </summary> /// <param name="ar">目标客户端Socket</param> private void SendDataEnd(IAsyncResult ar) { ((Socket)ar.AsyncState).EndSend(ar); } #endregion #region Events /// <summary> /// 接收到数据事件 /// </summary> public event EventHandler<EventArgs> DataReceived; private void RaiseDataReceived(Session session) { if (DataReceived != null) { DataReceived(this, new AsyncEventArgs(session)); } } /// <summary> /// 与客户端的连接已建立事件 /// </summary> public event EventHandler<AsyncEventArgs> ClientConnected; /// <summary> /// 与客户端的连接已断开事件 /// </summary> public event EventHandler<AsyncEventArgs> ClientDisconnected; /// <summary> /// 触发客户端连接事件 /// </summary> /// <param name="session"></param> private void RaiseClientConnected(Session session) { if (ClientConnected != null) { ClientConnected(this, new AsyncEventArgs(session)); } } /// <summary> /// 触发客户端连接断开事件 /// </summary> /// <param name="client"></param> private void RaiseClientDisconnected(Socket client) { if (ClientDisconnected != null) { ClientDisconnected(this, new AsyncEventArgs("连接断开")); } } /// <summary> /// 网络错误事件 /// </summary> public event EventHandler<AsyncEventArgs> NetError; /// <summary> /// 触发网络错误事件 /// </summary> /// <param name="client"></param> private void RaiseNetError(Session session) { if (NetError != null) { NetError(this, new AsyncEventArgs(session)); } } /// <summary> /// 异常事件 /// </summary> public event EventHandler<AsyncEventArgs> ServerException; /// <summary> /// 触发异常事件 /// </summary> /// <param name="client"></param> private void RaiseServerException(Session session) { if (ServerException != null) { ServerException(this, new AsyncEventArgs(session)); } } #endregion #region Close /// <summary> /// 关闭一个与客户端之间的会话 /// </summary> /// <param name="closeClient">需要关闭的客户端会话对象</param> public void CloseSession(Session session) { if (session != null) { session.Datagram = null; session.RecvDataBuffer = null; _clients.Remove(session); _clientCount--; //TODO 触发关闭事件 session.Close(); } } /// <summary> /// 关闭所有的客户端会话,与所有的客户端连接会断开 /// </summary> public void CloseAllClient() { foreach (Session client in _clients) { CloseSession(client); } _clientCount = 0; _clients.Clear(); } /// <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 RaiseServerException(null); } } disposed = true; } } #endregion } 其中使用了一个Session类，来封装对客户端的连接
Session,cs
/// <summary> /// 客户端与服务器之间的会话类 /// </summary> public class Session { #region 字段 /// <summary> /// 接收数据缓冲区 /// </summary> private byte[] _recvBuffer; /// <summary> /// 客户端发送到服务器的报文 /// 注意:在有些情况下报文可能只是报文的片断而不完整 /// </summary> private string _datagram; /// <summary> /// 客户端的Socket /// </summary> private Socket _clientSock; #endregion #region 属性 /// <summary> /// 接收数据缓冲区 /// </summary> public byte[] RecvDataBuffer { get { return _recvBuffer; } set { _recvBuffer = value; } } /// <summary> /// 存取会话的报文 /// </summary> public string Datagram { get { return _datagram; } set { _datagram = value; } } /// <summary> /// 获得与客户端会话关联的Socket对象 /// </summary> public Socket ClientSocket { get { return _clientSock; } } #endregion /// <summary> /// 构造函数 /// </summary> /// <param name="cliSock">会话使用的Socket连接</param> public Session(Socket cliSock) { _clientSock = cliSock; } /// <summary> /// 关闭会话 /// </summary> public void Close() { //关闭数据的接受和发送 _clientSock.Shutdown(SocketShutdown.Both); //清理资源 _clientSock.Close(); } } 事件类
class AsyncEventArgs : EventArgs { /// <summary> /// 提示信息 /// </summary> public string _msg; public Session _sessions; /// <summary> /// 是否已经处理过了 /// </summary> public bool IsHandled { get; set; } public AsyncEventArgs(string msg) { this._msg = msg; IsHandled = false; } public AsyncEventArgs(Session session) { this._sessions = session; IsHandled = false; } public AsyncEventArgs(string msg, Session session) { this._msg = msg; this._sessions = session; IsHandled = false; } } 来自：http://blog.csdn.net/zhujunxxxxx/article/details/43574655