C#中怎么利用Socket实现异步通讯

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C# Socket异步通讯客户端之主程序：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
// State object for receiving data from remote device.
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();
}
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); 
// 生成一个TCP/IP socket.  
Socket client = new Socket(AddressFamily.InterNetwork,  
SocketType.Stream, ProtocolType.Tcp);  
// 与目标终端连接.  
client.BeginConnect(remoteEP,  
new AsyncCallback(ConnectCallback), client);  
//等待，直到连接程序完成。在ConnectCallback中适当位置有connecDone.Set()语句  
connectDone.WaitOne();  
// 发送数据到远程终端.  
Send(client, "This is a test<EOF>");  
sendDone.WaitOne();  
// 接收返回数据.  
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();  
return 0;  
} 

C# Socket异步通讯客户端之连接部分Callback:

private static void ConnectCallback(IAsyncResult ar)  
{  
// 从state对象获取socket.  
Socket client = (Socket)ar.AsyncState;  
// 完成连接.  
client.EndConnect(ar);  
Console.WriteLine("Socket connected to {0}",  
client.RemoteEndPoint.ToString());  
// 连接已完成，主线程继续.  
connectDone.Set();
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}

C# Socket异步通讯客户端之数据接收：

   private static void Receive(Socket client)  
try {{  
// 构造容器state.  
StateObject state = new StateObject();  
state.workSocket = client;  
// 从远程目标接收数据.  
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)  
{  
// 从输入参数异步state对象中获取state和socket对象  
StateObject state = (StateObject)ar.AsyncState;  
Socket client = state.workSocket;  
//从远程设备读取数据  
int bytesRead = client.EndReceive(ar);  
if (bytesRead > 0)  
{  
// 有数据，存储.  
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));  
// 继续读取.  
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,  
new AsyncCallback(ReceiveCallback), state);  
}  
else 
{  
// 所有数据读取完毕.  
if (state.sb.Length > 1)  
{  
response = state.sb.ToString();  
}  
// 所有数据读取完毕的指示信号.  
receiveDone.Set();  
}  
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}

C# Socket异步通讯客户端之发送数据：

private static void Send(Socket client, String data)  
{  
// 格式转换.  
byte[] byteData = Encoding.ASCII.GetBytes(data);  
// 开始发送数据到远程设备.  
client.BeginSend(byteData, 0, byteData.Length, 0,  
new AsyncCallback(SendCallback), client);  
}   
private static void SendCallback(IAsyncResult ar)  
{  
// 从state对象中获取socket  
Socket client = (Socket)ar.AsyncState;  
// 完成数据发送.  
int bytesSent = client.EndSend(ar);  
Console.WriteLine("Sent {0} bytes to server.", bytesSent);  
// 指示数据已经发送完成，主线程继续.  
sendDone.Set();  
} 
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args) {
StartClient();
return 0;
}
}

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