C#实现UDP组播

[csharp]

    using System;  
    using System.Collections.Generic;  
    using System.Linq;  
    using System.Text;  
    using System.Net;  
    using System.Net.Sockets;  
    using System.Threading;  
      
    namespace Test  
    {  
        class Program  
        {  
            static void Main(string[] args)  
            {  
                UdpClient client = new UdpClient(5566);  
                client.JoinMulticastGroup(IPAddress.Parse("234.5.6.7"));  
                IPEndPoint multicast = new IPEndPoint(IPAddress.Parse("234.5.6.7"), 7788);  
                byte[] buf = Encoding.Default.GetBytes("Hello from multicast");  
                Thread t = new Thread(new ThreadStart(RecvThread));  
                t.IsBackground = true;  
                t.Start();  
                while (true)  
                {  
                    client.Send(buf, buf.Length, multicast);  
                    Thread.Sleep(1000);  
                }  
            }  
      
            static void RecvThread()  
            {  
                UdpClient client = new UdpClient(7788);  
                client.JoinMulticastGroup(IPAddress.Parse("234.5.6.7"));  
                IPEndPoint multicast = new IPEndPoint(IPAddress.Parse("234.5.6.7"), 5566);  
                while (true)  
                {  
                    byte[] buf = client.Receive(ref multicast);  
                    string msg = Encoding.Default.GetString(buf);  
                    Console.WriteLine(msg);  
                }  
            }  
        }  
    }  

 

组播地址为 224.0.0.0 ~ 239.255.255.255，其中 224.0.0.0~224.255.255.255 不建议在用户程序中使用，因为它们一般都有特殊用途。