C# UDP组播客户端【UDPClient】

方式一
UdpClient udp = new UdpClient(5566);//要通过其进行通信的本地端口号。  5566是源端口
            udp.JoinMulticastGroup(IPAddress.Parse("224.0.0.4"));//将 UdpClient 添加到多播组;IPAddress.Parse将IP地址字符串转换为IPAddress 实例
            IPEndPoint multicast = new IPEndPoint(IPAddress.Parse("224.0.0.4"), 7788); //将网络终结点表示为 IP 地址和端口号  7788是目的端口

            Thread thread = new Thread(() =>
            {
                while (true)
                {
                    try
                    {
                            //定义一个字节数组，用来存放发送到远程主机的信息
                            Byte[] sendBytes = Encoding.Default.GetBytes("(" + DateTime.Now.ToLongTimeString() + ")节目预报：八点有大型晚会，请收听");
                            Console.WriteLine("(" + DateTime.Now.ToLongTimeString() + ")节目预报：八点有大型晚会，请收听");
                            //调用UdpClient对象的Send方法将UDP数据报发送到远程主机
                            udp.Send(sendBytes, sendBytes.Length, multicast);//将UDP数据报发送到位于指定远程终结点的主机
                    }
                    catch (Exception ex)
                    {
                            //Console.WriteLine(ex.Message);
                    }
                    Thread.Sleep(2000);
                }
            });
            thread.Start();//启动线程

方式二
 try
            {
                UdpClient client = new UdpClient(5566);
                IPEndPoint multicastEndpoint = new IPEndPoint(IPAddress.Parse("234.5.6.7"), 11000);
                IPEndPoint multicastEndpoint2 = new IPEndPoint(IPAddress.Parse("234.5.6.9"), 11001);

                string message = "Hello, Multicast World!";
                byte[] data = Encoding.UTF8.GetBytes(message);
                string message2 = "Hello, Multicast World22!";
                byte[] data2 = Encoding.UTF8.GetBytes(message2);

                client.JoinMulticastGroup(IPAddress.Parse("234.5.6.8"));
                client.Send(data, data.Length, multicastEndpoint);
                client.Send(data2, data2.Length, multicastEndpoint2);




                client.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }