本文实例讲述了C#基于UDP进行异步通信的方法。分享给大家供大家参考。具体如下：
服务器端：
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncServer
{
public class UdpState
{
public UdpClient udpClient;
public IPEndPoint ipEndPoint;
public const int BufferSize = 1024;
public byte[] buffer = new byte[BufferSize];
public int counter = 0;
}
public class AsyncUdpSever
{
private IPEndPoint ipEndPoint = null;
private IPEndPoint remoteEP = null;
private UdpClient udpReceive = null;
private UdpClient udpSend = null;
private const int listenPort = 1100;
private const int remotePort = 1101;
UdpState udpReceiveState = null;
UdpState udpSendState = null;
private ManualResetEvent sendDone = new ManualResetEvent(false);
private ManualResetEvent receiveDone = new ManualResetEvent(false);
public AsyncUdpSever()
{
ipEndPoint = new IPEndPoint(IPAddress.Any, listenPort);
remoteEP = new IPEndPoint(Dns.GetHostAddresses(Dns.GetHostName())[0], remotePort);
udpReceive = new UdpClient(ipEndPoint);
udpSend = new UdpClient();
udpReceiveState = new UdpState();
udpReceiveState.udpClient = udpReceive;
udpReceiveState.ipEndPoint = ipEndPoint;
udpSendState = new UdpState();
udpSendState.udpClient = udpSend;
udpSendState.ipEndPoint = remoteEP;
}
public void ReceiveMsg()
{
Console.WriteLine("listening for messages");
while(true)
{
lock (this)
{
IAsyncResult iar = udpReceive.BeginReceive(new AsyncCallback(ReceiveCallback), udpReceiveState);
receiveDone.WaitOne();
Thread.Sleep(100);
}
}
}
private void ReceiveCallback(IAsyncResult iar)
{
UdpState udpReceiveState = iar.AsyncState as UdpState;
if (iar.IsCompleted)
{
Byte[] receiveBytes = udpReceiveState.udpClient.EndReceive(iar, ref udpReceiveState.ipEndPoint);
string receiveString = Encoding.ASCII.GetString(receiveBytes);
Console.WriteLine("Received: {0}", receiveString);
//Thread.Sleep(100);
receiveDone.Set();
SendMsg();
}
}
private void SendMsg()
{
udpSend.Connect(udpSendState.ipEndPoint);
udpSendState.udpClient = udpSend;
udpSendState.counter ++;
string message = string.Format("第{0}个UDP请求处理完成！",udpSendState.counter);
Byte[] sendBytes = Encoding.Unicode.GetBytes(message);
udpSend.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), udpSendState);
sendDone.WaitOne();
}
private void SendCallback(IAsyncResult iar)
{
UdpState udpState = iar.AsyncState as UdpState;
Console.WriteLine("第{0}个请求处理完毕！", udpState.counter);
Console.WriteLine("number of bytes sent: {0}", udpState.udpClient.EndSend(iar));
sendDone.Set();
}
public static void Main()
{
AsyncUdpSever aus = new AsyncUdpSever();
Thread t = new Thread(new ThreadStart(aus.ReceiveMsg));
t.Start();
Console.Read();
}
}
}
客户端：
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncClient
{
public class UdpState
{
public UdpClient udpClient = null;
public IPEndPoint ipEndPoint = null;
public const int BufferSize = 1024;
public byte[] buffer = new byte[BufferSize];
public int counter = 0;
}
public class AsyncUdpClient
{
public static bool messageSent = false;
// Receive a message and write it to the console.
private const int listenPort = 1101;
private const int remotePort = 1100;
private IPEndPoint localEP = null;
private IPEndPoint remoteEP = null;
private UdpClient udpReceive = null;
private UdpClient udpSend = null;
private UdpState udpSendState = null;
private UdpState udpReceiveState = null;
private int counter = 0;
private ManualResetEvent sendDone = new ManualResetEvent(false);
private ManualResetEvent receiveDone = new ManualResetEvent(false);
private Socket receiveSocket;
private Socket sendSocket;
public AsyncUdpClient()
{
localEP = new IPEndPoint(IPAddress.Any, listenPort);
remoteEP = new IPEndPoint(Dns.GetHostAddresses(Dns.GetHostName())[0],remotePort);
udpReceive = new UdpClient(localEP);
udpSend = new UdpClient();
udpSendState = new UdpState();
udpSendState.ipEndPoint = remoteEP;
udpSendState.udpClient = udpSend;
udpReceiveState = new UdpState();
udpReceiveState.ipEndPoint = remoteEP;
udpReceiveState.udpClient = udpReceive;
receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
receiveSocket.Bind(localEP);
sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sendSocket.Bind(remoteEP);
}
public void SendMsg()
{
udpSend.Connect(remoteEP);
//Thread t = new Thread(new ThreadStart(ReceiveMessages));
//t.Start();
Byte[] sendBytes;
string message;
while (true)
{
message = "Client" + (counter++).ToString();
lock (this)
{
sendBytes = Encoding.ASCII.GetBytes(message);
udpSendState.counter = counter;
udpSend.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), udpSendState);
sendDone.WaitOne();
Thread.Sleep(200);
ReceiveMessages();
}
}
}
public void SendCallback(IAsyncResult iar)
{
UdpState udpState = iar.AsyncState as UdpState;
if (iar.IsCompleted)
{
Console.WriteLine("第{0}个发送完毕！", udpState.counter);
Console.WriteLine("number of bytes sent: {0}", udpState.udpClient.EndSend(iar));
//if (udpState.counter == 10)
//{
// udpState.udpClient.Close();
//}
sendDone.Set();
}
}
public void ReceiveMessages()
{
lock (this)
{
udpReceive.BeginReceive(new AsyncCallback(ReceiveCallback), udpReceiveState);
receiveDone.WaitOne();
Thread.Sleep(100);
}
}
public void ReceiveCallback(IAsyncResult iar)
{
UdpState udpState = iar.AsyncState as UdpState;
if (iar.IsCompleted)
{
Byte[] receiveBytes = udpState.udpClient.EndReceive(iar, ref udpReceiveState.ipEndPoint);
string receiveString = Encoding.Unicode.GetString(receiveBytes);
Console.WriteLine("Received: {0}", receiveString);
receiveDone.Set();
}
}
public static void Main()
{
AsyncUdpClient auc = new AsyncUdpClient();
auc.SendMsg();
Console.Read();
}
}
}
希望本文所述对大家的C#程序设计有所帮助。
