UDP基本使用

UdpClient类​​：对Socket的封装，简化了发送/接收数据的操作（推荐新手使用）；

UDP不存在连接

 

完整Demo代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace _018_UDP
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 创建UdpClient并绑定本地端口（8890）
        UdpClient udpServer = new UdpClient(8890);
       // IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0); // 接收任意IP的任意端口数据
        IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8899); 
        private void button1_Click(object sender, EventArgs e)
        {
            // 发送响应（可选）
            string response = "消息已收到";
            byte[] sendData = Encoding.UTF8.GetBytes(response);
            int SendBytesCount=udpServer.Send(sendData, sendData.Length, remoteEndPoint);
            //MessageBox.Show(SendBytesCount.ToString());

            Console.WriteLine("发送数据：" + response);  
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            // 异步接收数据（非阻塞）
            byte[] receivedData = udpServer.Receive(ref remoteEndPoint);
            string message = Encoding.UTF8.GetString(receivedData);
            Console.WriteLine($"接收到来自 {remoteEndPoint} 的消息：{message}");



        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Task.Factory.StartNew(() =>
            {

                while (true)
                {
                    try
                    {
                        // 异步接收数据（非阻塞）
                        byte[] receivedData = udpServer.Receive(ref remoteEndPoint);
                        string message = Encoding.UTF8.GetString(receivedData);
                        Console.WriteLine($"接收到来自 {remoteEndPoint} 的消息：{message}");
                    }
                    catch (Exception ex)
                    {

                        throw;
                    }
                    finally
                    {
                        Thread.Sleep(10);
                    }
                  
                }
            });
        }

        private void button2_Click(object sender, EventArgs e)
        {
            udpServer.Close();
        }
    }
}