C#簡單組播例子

轉自http://www.cnblogs.com/yansheng/archive/2011/11/15/2249287.html，如有侵權聯繫刪除

使用組播有一個很大的好處，消息往只管往裏面丟，接受端開個線程，不斷地接收就可以了。

發送端：
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("224.0.0.1"), 3000);
EndPoint ep = (EndPoint)iep;
byte[] b = Encoding.ASCII.GetBytes("just a test!");
s.SendTo(b, ep);
s.Close();

接收端：
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint iep = new IPEndPoint(IPAddress.Any, 3000);
EndPoint ep=(EndPoint)iep;
s.Bind(iep);
s.SetSocketOption(SocketOptionLevel.IP,SocketOptionName.AddMembership,new MulticastOption(IPAddress.Parse("224.0.0.1")));
byte[]b=new byte[1024];
s.ReceiveFrom(b,ref ep);
string test;
test = System.Text.Encoding.ASCII.GetString(b);
Console.WriteLine(test);
s.Close();
Console.ReadKey();