C#实现UDP组播

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1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Text;  
5. using System.Net;  
6. using System.Net.Sockets;  
7. using System.Threading;  
8.   
9. namespace Test  
10. {  
11.     class Program  
12.     {  
13.         static void Main(string[] args)  
14.         {  
15.             UdpClient client = new UdpClient(5566);  
16.             client.JoinMulticastGroup(IPAddress.Parse("234.5.6.7"));  
17.             IPEndPoint multicast = new IPEndPoint(IPAddress.Parse("234.5.6.7"), 7788);  
18.             byte[] buf = Encoding.Default.GetBytes("Hello from multicast");  
19.             Thread t = new Thread(new ThreadStart(RecvThread));  
20.             t.IsBackground = true;  
21.             t.Start();  
22.             while (true)  
23.             {  
24.                 client.Send(buf, buf.Length, multicast);  
25.                 Thread.Sleep(1000);  
26.             }  
27.         }  
28.   
29.         static void RecvThread()  
30.         {  
31.             UdpClient client = new UdpClient(7788);  
32.             client.JoinMulticastGroup(IPAddress.Parse("234.5.6.7"));  
33.             IPEndPoint multicast = new IPEndPoint(IPAddress.Parse("234.5.6.7"), 5566);  
34.             while (true)  
35.             {  
36.                 byte[] buf = client.Receive(ref multicast);  
37.                 string msg = Encoding.Default.GetString(buf);  
38.                 Console.WriteLine(msg);  
39.             }  
40.         }  
41.     }  
42. }  

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。