C# SOCKET UDP通信实例

转自:http://blog.csdn.net/adamchin/article/details/6295010

服务端：

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;

 namespace UdpServer
 {
     public partial class UdpServer : Form
     {
         //创建一个Thread类
         private Thread thread1;
         //创建一个UdpClient对象，来接收消息
         private UdpClient udpReceive;
         private UdpClient udpSend;

         public UdpServer()
         {
             InitializeComponent();
         }
         private void BtnSend_Click(object sender, EventArgs e)
         {
             //初始化UdpClient
             udpSend = new UdpClient();
             //允许发送和接收广播数据报
             udpSend.EnableBroadcast = true;
             //必须使用组播地址范围内的地址
             IPEndPoint iep = new IPEndPoint(IPAddress.Parse("224.100.0.10"), 8001);
             //将发送内容转换为字节数组
             byte[] bytes = System.Text.Encoding.UTF8.GetBytes(TbxMessage.Text);
             //设置重传次数
             int retry = 0;
             while (true)
             {
                 try
                 {
                     //发送组播信息
                     udpSend.Send(bytes, bytes.Length, iep);
                     break;
                 }
                 catch
                 {
                     if (retry < 3)
                     {
                         retry++; continue;
                     }
                     else
                     {
                         DialogResult result = MessageBox.Show("发送失败！");
                         break;
                     }
                 }
             }
             //清空TbxMesage中的内容
             TbxMessage.Clear();
             //光标还原
             TbxMessage.Focus();
         }
         private void ReceiveMessage()
         {
             //在本机指定的端口接收
             IPEndPoint remoteIpEndIPoint = new IPEndPoint(IPAddress.Any, 8002);
             udpReceive = new UdpClient(remoteIpEndIPoint);
             IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0);
             //接收从远程主机发送过来的信息
             while (true)
             {
                 //ref表示引用类型的 IPPoint实例接收消息
                 byte[] receiveBytes = udpReceive.Receive(ref iep);
                 string returnData = Encoding.UTF8.GetString(receiveBytes);
                 string message = "来自" + iep.ToString() + "的消息";
                 //显示消息 并以message为消息的标题
                 DialogResult result = MessageBox.Show(returnData, message);
             }
         }
         private void UdpServer_Load(object sender, EventArgs e)
         {
             //初始化该线程并指定线程执行时要调用的方法
             thread1 = new Thread(new ThreadStart(ReceiveMessage));
             //启动线程
             thread1.Start();
         }
         private void UdpServer_FormClosing(object sender, FormClosingEventArgs e)
         {
             //关闭UdpClient连接
             udpReceive.Close();
             udpSend.Close();
             //终止线程
             thread1.Abort();
         }

     }
 }

 

客户端：

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;

 namespace myUdpClient
 {
     public partial class myUdpClient : Form
     {
         //创建一个Thread实例
         private Thread thread1;
         //创建一个UdpClient实例
         private UdpClient udpReceive;
         private UdpClient udpSend;
         private byte[] bytes;
         //private DialogResult result;

         public myUdpClient()
         {
             InitializeComponent();
         }
         private void myUdpClient_Load(object sender, EventArgs e)
         {
             thread1 = new Thread(new ThreadStart(ReceiveMessage));
             thread1.Start();
         }
         private void ReceiveMessage()
         {
             //在本机指定的端口接收
             udpReceive = new UdpClient(8001);
             //将套接字加入组播组
             udpReceive.JoinMulticastGroup(IPAddress.Parse("224.100.0.10"), 50);
             //接收从远程主机发送过来的信息
             IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0);
             while (true)
             {
                 //ref表示引用类型的 IPPoint实例接收消息
                 try
                 {
                     bytes = udpReceive.Receive(ref iep);
                 }
                 catch (SocketException e)
                 {
                     DialogResult result = MessageBox.Show("发送失败！");
                 }
                 string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
                 string message = "来自" + iep.ToString() + "的消息";
                 //显示消息 并以message为消息的标题
                 DialogResult res = MessageBox.Show(str, message);
             }
         }
         private void BtnSend_Click(object sender, EventArgs e)
         {
             //初始化UdpClient
             udpSend = new UdpClient();
             //实际使用时应将127.0.0.1改为服务器的远程IP
             IPAddress remoteIPAddress = IPAddress.Parse("127.0.0.1");
             IPEndPoint remoteIPEndPoint = new IPEndPoint(remoteIPAddress, 8002);
             //将发送内容转换为字节数组
             byte[] bytes = System.Text.Encoding.UTF8.GetBytes(TbxMessage.Text);
             //设置重传次数
             int retry = 0;
             while (true)
             {
                 try
                 {
                     udpSend.Send(bytes, bytes.Length, remoteIPEndPoint);
                     break;
                 }
                 catch (SocketException se)
                 {
                     if (retry < 3)
                     {
                         retry++; continue;
                     }
                     else
                     {
                         DialogResult result = MessageBox.Show("发送失败！");
                         break;
                     }
                 }
             }
             //清空TbxMesage中的内容
             TbxMessage.Clear();
             //光标还原
             TbxMessage.Focus();
             //关闭UdpClient
         }

         private void myUdpClient_FormClosing(object sender, FormClosingEventArgs e)
         {
             //关闭连接
             udpReceive.Close();
             udpSend.Close();
             //终止线程
             thread1.Abort();
         }
     }
 }