最典型的应用,就是在异步调用时进行回调,看看MSDN上的例子吧。
using System; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading;
// State object for reading client data asynchronously public class StateObject { // Client socket. public Socket workSocket = null; // Size of receive buffer. public const int BufferSize = 1024; // Receive buffer. public byte[] buffer = new byte[BufferSize]; // Received data string. public StringBuilder sb = new StringBuilder(); }
public class AsynchronousSocketListener { // Thread signal. public static ManualResetEvent allDone = new ManualResetEvent(false);
public AsynchronousSocketListener() { }
public static void StartListening() { // Data buffer for ing data. byte[] bytes = new Byte[1024];
// Establish the local endpoint for the socket. // The DNS name of puter // running the listener is "". IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName()); 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 ing 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..."); ept( new AsyncCallback(eptCallback), listener );
// Wait until a connection is made before continuing. allDone.WaitOne(); }
} catch (Exception e) { Console.WriteLine(e.ToString()); }
Console.WriteLine(" Press ENTER to continue..."); Console.Read(); }
public static void eptCallback(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 = ept(ar);
// Create the state object. StateObject state = new StateObject(); state.workSocket = handler; handler.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(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. Data : {1}", content.Length, content ); // Echo the data back to the client. Send(handler, 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; } }
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