C#中怎么利用Socket實現異步通訊

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C# Socket異步通訊客戶端之主程序：

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); 
// 生成一個TCP/IP socket.  
Socket client = new Socket(AddressFamily.InterNetwork,  
SocketType.Stream, ProtocolType.Tcp);  
 
// 與目標終端連接.  
client.BeginConnect(remoteEP,  
new AsyncCallback(ConnectCallback), client);  
//等待，直到連接程序完成。在ConnectCallback中適當位置有connecDone.Set()語句  
connectDone.WaitOne();  
 
// 發送數據到遠程終端.  
Send(client, "This is a test<EOF>");  
sendDone.WaitOne();  
 
// 接收返回數據.  
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異步通訊客戶端之連接部分Callback:

private static void ConnectCallback(IAsyncResult ar)  
{  
 
// 從state對象獲取socket.  
Socket client = (Socket)ar.AsyncState;  
 
// 完成連接.  
client.EndConnect(ar);  
 
Console.WriteLine("Socket connected to {0}",  
client.RemoteEndPoint.ToString());  
 
// 連接已完成，主線程繼續.  
connectDone.Set();
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}

C# Socket異步通訊客戶端之數據接收：

   private static void Receive(Socket client)  
try {{  
 
// 構造容器state.  
StateObject state = new StateObject();  
state.workSocket = client;  
 
// 從遠程目標接收數據.  
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)  
{  
 
// 從輸入參數異步state對象中獲取state和socket對象  
StateObject state = (StateObject)ar.AsyncState;  
Socket client = state.workSocket;  
 
//從遠程設備讀取數據  
int bytesRead = client.EndReceive(ar);  
 
if (bytesRead > 0)  
{  
// 有數據，存儲.  
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));  
 
// 繼續讀取.  
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,  
new AsyncCallback(ReceiveCallback), state);  
}  
else 
{  
// 所有數據讀取完畢.  
if (state.sb.Length > 1)  
{  
response = state.sb.ToString();  
}  
// 所有數據讀取完畢的指示信號.  
receiveDone.Set();  
}  
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}

C# Socket異步通訊客戶端之發送數據：

private static void Send(Socket client, String data)  
{  
// 格式轉換.  
byte[] byteData = Encoding.ASCII.GetBytes(data);  
 
// 開始發送數據到遠程設備.  
client.BeginSend(byteData, 0, byteData.Length, 0,  
new AsyncCallback(SendCallback), client);  
}   
private static void SendCallback(IAsyncResult ar)  
{  
 
// 從state對象中獲取socket  
Socket client = (Socket)ar.AsyncState;  
 
// 完成數據發送.  
int bytesSent = client.EndSend(ar);  
Console.WriteLine("Sent {0} bytes to server.", bytesSent);  
 
// 指示數據已經發送完成，主線程繼續.  
sendDone.Set();  
} 
} catch (Exception e) {
Console.WriteLine(e.ToString());
}

}
public static int Main(String[] args) {
StartClient();
return 0;
}
}

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