C# Socket 异步通讯

客户端Client：

//预定义结构体，用于异步委托之间的传递。用户根据自己需要定制即可public class StateObject{// Client socket.public Socket workSocket = null;// Size of receive buffer.public const int BufferSize = 256;// Receive buffer.public byte[] buffer = new byte[BufferSize];// Received data string.public StringBuilder sb = new StringBuilder();}//正文：public class AsynchronousClient{// The port number for the remote device.private const int port = 11000;// ManualResetEvent instances signal completion.private static ManualResetEvent connectDone = new ManualResetEvent(false);private static ManualResetEvent sendDone = new ManualResetEvent(false);private static ManualResetEvent receiveDone = new ManualResetEvent(false);// The response from the remote device.private static String response = String.Empty;private static void StartClient(){// Connect to a remote device.try{// Establish the remote endpoint for the socket.// The name of the remote device is \"host.contoso.com\".IPHostEntry ipHostInfo = Dns.Resolve(\"host.contoso.com\");IPAddress ipAddress = ipHostInfo.AddressList[0];IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);// Create a TCP/IP socket.Socket client = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);// Connect to the remote endpoint.client.BeginConnect(remoteEP,new AsyncCallback(ConnectCallback), client);connectDone.WaitOne();// Send test data to the remote device.Send(client, \"This is a test<EOF>\");sendDone.WaitOne();// Receive the response from the remote device.Receive(client);receiveDone.WaitOne();// Write the response to the console.Console.WriteLine(\"Response received : {0}\", response);// Release the socket.client.Shutdown(SocketShutdown.Both);client.Close();}catch (Exception e){Console.WriteLine(e.ToString());}}private static void ConnectCallback(IAsyncResult ar){try{// Retrieve the socket from the state object.Socket client = (Socket)ar.AsyncState;// Complete the connection.client.EndConnect(ar);Console.WriteLine(\"Socket connected to {0}\",client.RemoteEndPoint.ToString());// Signal that the connection has been made.connectDone.Set();}catch (Exception e){Console.WriteLine(e.ToString());}}private static void Receive(Socket client){try{// Create the state object.StateObject state = new StateObject();state.workSocket = client;// Begin receiving the data from the remote device.client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,new AsyncCallback(ReceiveCallback), state);}catch (Exception e){Console.WriteLine(e.ToString());}}private static void ReceiveCallback(IAsyncResult ar){try{// Retrieve the state object and the client socket// from the asynchronous state object.StateObject state = (StateObject)ar.AsyncState;Socket client = state.workSocket;// Read data from the remote device.int bytesRead = client.EndReceive(ar);if (bytesRead > 0){// There might be more data, so store the data received so far.state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));// Get the rest of the data.client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,new AsyncCallback(ReceiveCallback), state);}else{// All the data has arrived; put it in response.if (state.sb.Length > 1){response = state.sb.ToString();}// Signal that all bytes have been received.receiveDone.Set();}}catch (Exception e){Console.WriteLine(e.ToString());}}private static void Send(Socket client, String data){// Convert the string data to byte data using ASCII encoding.byte[] byteData = Encoding.ASCII.GetBytes(data);// Begin sending the data to the remote device.client.BeginSend(byteData, 0, byteData.Length, 0,new AsyncCallback(SendCallback), client);}private static void SendCallback(IAsyncResult ar){try{// Retrieve the socket from the state object.Socket client = (Socket)ar.AsyncState;// Complete sending the data to the remote device.int bytesSent = client.EndSend(ar);Console.WriteLine(\"Sent {0} bytes to server.\", bytesSent);// Signal that all bytes have been sent.sendDone.Set();}catch (Exception e){Console.WriteLine(e.ToString());}}public static int Main(String[] args){StartClient();return 0;}}

服务器端Server：

// State object for reading client data asynchronouslypublic class AsynchronousSocketListener{// Thread signal.public static ManualResetEvent allDone = new ManualResetEvent(false);public AsynchronousSocketListener(){}public static void StartListening(){// Data buffer for incoming data.byte[] bytes = new Byte[1024];// Establish the local endpoint for the socket.// The DNS name of the computer// running the listener is \"host.contoso.com\".//IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());IPHostEntry ipHostInfo = Dns.Resolve(\"127.0.0.1\");IPAddress ipAddress = ipHostInfo.AddressList[0];IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);// Create a TCP/IP socket.Socket listener = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);// Bind the socket to the local endpoint and listen for incoming connections.try{listener.Bind(localEndPoint);listener.Listen(100);while (true){// Set the event to nonsignaled state.allDone.Reset();// Start an asynchronous socket to listen for connections.Console.WriteLine(\"Waiting for a connection...\");listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);// Wait until a connection is made before continuing.allDone.WaitOne();}}catch (Exception e){Console.WriteLine(e.ToString());}Console.WriteLine(\"\\nPress ENTER to continue...\");Console.Read();}public static void AcceptCallback(IAsyncResult ar){// Signal the main thread to continue.allDone.Set();// Get the socket that handles the client request.Socket listener = (Socket)ar.AsyncState;Socket handler = listener.EndAccept(ar);// Create the state object.StateObject state = new StateObject();state.workSocket = handler;handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,newAsyncCallback(ReadCallback), state);}public static void ReadCallback(IAsyncResult ar){String content = String.Empty;// Retrieve the state object and the handler socket// from the asynchronous state object.StateObject state = (StateObject)ar.AsyncState;Socket handler = state.workSocket;// Read data from the client socket.int bytesRead = handler.EndReceive(ar);if (bytesRead > 0){// There    might be more data, so store the data received so far.state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));// Check for end-of-file tag. If it is not there, read// more data.content = state.sb.ToString();if (content.IndexOf(\"<EOF>\") > -1){// All the data has been read from the// client. Display it on the console.Console.WriteLine(\"Read {0} bytes from socket. \\n Data : {1}\",content.Length, content);// Echo the data back to the client.Send(handler, \"Server return :\" + content);}else{// Not all data received. Get more.handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,new AsyncCallback(ReadCallback), state);}}}private static void Send(Socket handler, String data){// Convert the string data to byte data using ASCII encoding.byte[] byteData = Encoding.ASCII.GetBytes(data);// Begin sending the data to the remote device.handler.BeginSend(byteData, 0, byteData.Length, 0,new AsyncCallback(SendCallback), handler);}private static void SendCallback(IAsyncResult ar){try{// Retrieve the socket from the state object.Socket handler = (Socket)ar.AsyncState;// Complete sending the data to the remote device.int bytesSent = handler.EndSend(ar);Console.WriteLine(\"Sent {0} bytes to client.\", bytesSent);handler.Shutdown(SocketShutdown.Both);handler.Close();}catch (Exception e){Console.WriteLine(e.ToString());}}public static int Main(String[] args){StartListening();return 0;}}

文章转自：C# Socket编程 同步以及异步通信