Socket基础之客户端（基于UDP）-优快云博客

本文展示了如何使用C#实现客户端与服务端通过UDP协议进行通信的过程，包括设置服务端终结点、创建与服务端连接的套接字、发送和接收消息，并能实时接收并响应服务端发回的信息。

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Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName());

//设置服务端终结点
IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8001);

//创建与服务端连接的套接字，指定网络类型，数据连接类型和网络协议
Socket ConnSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            string welcome = "Client Message:Hello!!!";
            byte[] data = new byte[1024];
            data = Encoding.ASCII.GetBytes(welcome);

            //给服务端发送测试消息
            ConnSocket.SendTo(data, data.Length, SocketFlags.None, ipe);
            IPEndPoint server = new IPEndPoint(IPAddress.Any, 0);
            //服务端终结点
            EndPoint Remote = (EndPoint)server;

            data = new byte[1024];
            //对于不存在的IP地址，加入此行代码后，可以在指定时间内解除阻塞模式限制
            //server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 100);
            int recv = ConnSocket.ReceiveFrom(data, ref Remote);
            //打印从服务端发回的信息
            Console.WriteLine("Message received from {0}: ", Remote.ToString());
            Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
            while (true) //可以实时给服务端发送消息
            {
                string input = Console.ReadLine();
                if (input == "exit") //中断连接
                {
                    ConnSocket.SendTo(Encoding.ASCII.GetBytes(input), Remote);
                    data = new byte[1024];
                    recv = ConnSocket.ReceiveFrom(data, ref Remote);
                    Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                    break;
                }
                else
                {
                    ConnSocket.SendTo(Encoding.ASCII.GetBytes("Client Message:" + input), Remote);
                    data = new byte[1024];
                    recv = ConnSocket.ReceiveFrom(data, ref Remote);
                    Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
                }
            }
            Console.WriteLine("Stopping Client.");
            ConnSocket.Close();