C#中使用UDP通信

UDP通信是无连接通信，客户端在发送数据前无需与服务器端建立连接，即使服务器端不在线也可以发送，但是不能保证服务器端可以收到数据。

服务器端代码：

 

static void Main(string[] args)
        {
            UdpClient client = null;
            string receiveString = null;
            byte[] receiveData = null;
            //实例化一个远程端点，IP和端口可以随意指定，等调用client.Receive(ref remotePoint)时会将该端点改成真正发送端端点
            IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0);

            while (true)
            {
                client = new UdpClient(11000);
                receiveData = client.Receive(ref remotePoint);//接收数据
                receiveString = Encoding.Default.GetString(receiveData);
                Console.WriteLine(receiveString);
                client.Close();//关闭连接
            }
        }

 客户端代码：

 

static void Main(string[] args)
        {
            string sendString = null;//要发送的字符串
            byte[] sendData = null;//要发送的字节数组
            UdpClient client = null;

            IPAddress remoteIP = IPAddress.Parse("127.0.0.1");
            int remotePort = 11000;
            IPEndPoint remotePoint = new IPEndPoint(remoteIP, remotePort);//实例化一个远程端点

            while (true)
            {
                sendString = Console.ReadLine();
                sendData = Encoding.Default.GetBytes(sendString);

                client = new UdpClient();
                client.Send(sendData, sendData.Length, remotePoint);//将数据发送到远程端点
                client.Close();//关闭连接
            }
        }