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   源码介绍

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改一下端口号就能互发消息

using System;

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Threading.Tasks;







namespace C1

{

    class Program

    {

        static void Main(string[] args)

        {

            IPAddress ip = null;

            IPAddress[] ips = Dns.GetHostAddresses("");

            foreach (var v in ips)

            {

                if (v.AddressFamily == AddressFamily.InterNetwork)

                {

                    ip = v;

                    break;

               }

            }

            IPEndPoint iep = new IPEndPoint(ip, 8001);

            string Addrstr = "224.0.0.6";

           IPAddress muticastAddress = IPAddress.Parse(Addrstr);

            Console.WriteLine("在端口{0}监听，加入的多播组为{1}", iep.Port, muticastAddress);

            UdpClient client = new UdpClient(iep);

            client.JoinMulticastGroup(muticastAddress);

            IPEndPoint remoteEp = null;

            var t1 = Task.Run(() =>

            {

                while (true)

                {

                    var result = client.Receive(ref remoteEp);

                    Console.WriteLine("来自{0}：{1}", remoteEp, Encoding.Unicode.GetString(result));

               }

            }

            );

            var t2 = Task.Run(() =>

            {

                string str = Console.ReadLine();

                byte[] bytes = Encoding.Unicode.GetBytes(str);

                client.Send(bytes, bytes.Length, Addrstr, 8001);

                client.Send(bytes, bytes.Length, Addrstr, 8002);

                client.Send(bytes, bytes.Length, Addrstr, 8003);

            });

            t1.Wait();

            t2.Wait();

        }

    }

}