C# 简单实现udp

服务端:

UdpClient udpClient = new UdpClient(7777);//端口

IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);

 while (true)

 {

                Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);

                string returnData = Encoding.ASCII.GetString(receiveBytes);

                udpClient.Connect(RemoteIpEndPoint.Address.ToString(), Convert.ToInt32(RemoteIpEndPoint.Port));

                Byte[] sendBytes = Encoding.ASCII.GetBytes("hello World! i am a server");

                udpClient.Send(sendBytes, sendBytes.Length);

                // udpClient.Close();  

                             }

 

客户端:

UdpClient udpClient = new UdpClient(8888);
            string ip = Dns.GetHostName().ToString();
            udpClient.Connect(IPAddress.Parse("127.0.0.1"), 7777);
            // Sends a message to the host to which you have connected.
            Byte[] sendBytes = Encoding.ASCII.GetBytes("hello world! i am a client");
            udpClient.Send(sendBytes, sendBytes.Length);
            //IPEndPoint object will allow us to read datagrams sent from any source.
            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
            // Blocks until a message returns on this socket from a remote host.
            Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
            string returnData = Encoding.ASCII.GetString(receiveBytes);
            udpClient.Close();