C#实现UDP通信

一、UDP服务器

1、关键类： UdpClient、IPEndPoint；

2、实例化一个UdpClient对象；

3、使用IPEndPoint建立与远程对象的连接；

4、开一个异步新任务发送数据；

5、主进程接收数据； 

示例代码：  

        public static void Main()
        {
            UdpClient client = new UdpClient(8889);
            CancellationTokenSource cts = new CancellationTokenSource();
            IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0);
            Task.Factory.StartNew(() =>
            {
                while (!cts.IsCancellationRequested)
                {
                    string? sendMessage = Console.ReadLine();
                    if (sendMessage != null)
                    {
                        byte[] data = Encoding.Default.GetBytes(sendMessage);
                        client.Send(data, remotePoint);
                    }
                }
            }, cts.Token);
            while (true)
            {
                byte[] recvdata = client.Receive(ref remotePoint);
                if (recvdata != null)
                {
                    string recvMessage = Encoding.UTF8.GetString(recvdata);
                    if (recvMessage == "quit")
                    {
                        cts.Cancel();
                        client.Close();
                        return;
                    }
                    StringBuilder sb = new StringBuilder("客户端：");
                    sb.Append(recvMessage);
                    Console.WriteLine(sb);
                }
            }
        }

 

二、UDP客户端

1、关键类： UdpClient、IPEndPoint；

2、实例化一个UdpClient对象；

3、使用IPEndPoint建立与远程服务器的连接；

4、开新任务接收数据；

5、主进程发送数据；

示例代码：

        public static void Main()
        {
            UdpClient client = new UdpClient(8888);
            IPAddress remoteIp = IPAddress.Parse("127.0.0.1");
            int remotePort = 8889;
            IPEndPoint? remoteEndPoint = new IPEndPoint(remoteIp, remotePort);
            CancellationTokenSource cts = new CancellationTokenSource();

            Task.Factory.StartNew(() =>
            {
                while (!cts.IsCancellationRequested)
                {
                    try
                    {
                        byte[] data = client.Receive(ref remoteEndPoint);
                        if (data != null)
                        {
                            StringBuilder sb = new StringBuilder("服务器：");
                            sb.Append(Encoding.UTF8.GetString(data));
                            Console.WriteLine(sb);
                        }
                    }
                    catch (Exception ex) 
                    {
                        Console.WriteLine(ex.ToString());
                        break ;
                    }
                }
            }, cts.Token);

            while (true)
            {
                string? sendMessage = Console.ReadLine();
                if (sendMessage != null)
                {
                    byte[] data = Encoding.Default.GetBytes(sendMessage);
                    client.Send(data, remoteEndPoint);
                    if (sendMessage == "quit")
                    {
                        cts.Cancel();
                        client.Close();
                        return;
                    }
                }
            }
        }

三、最终效果