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UDPServer/Frm_Server.cs

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+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.Windows.Forms;
+
+namespace UDPServer
+{
+    public partial class Frm_Server : Form
+    {
+        UdpClient client;
+        IPEndPoint endpoint;
+        Dictionary<string, IPEndPoint> userinfo = new Dictionary<string, IPEndPoint>();
+        public Frm_Server()
+        {
+            InitializeComponent();
+        }
+
+        private void Frm_Server_Load(object sender, EventArgs e)
+        {
+            client = new UdpClient(new IPEndPoint(IPAddress.Any, 25433));
+            endpoint = new IPEndPoint(IPAddress.Any, 0);
+            //启动客户端监听
+            Thread t = new Thread(new ThreadStart(ClientThread));
+            t.Start();
+
+        }
+
+
+        private void button_Click(object sender, EventArgs e)
+        {
+
+            foreach (var item in userinfo)
+            {
+                byte[] buf = Encoding.Default.GetBytes("用户: " + item.Key + " 消息: " + msg.Text);
+                client.Send(buf, buf.Length, item.Value);
+            }
+        }
+
+        private void ClientThread()
+        {
+            try
+            {
+                Console.WriteLine("服务器开始监听...");
+                while (true)
+                {
+                    byte[] buf = client.Receive(ref endpoint);
+                    string msg = Encoding.Default.GetString(buf);
+                    string[] info = msg.Split(' ');
+                    if (info.Length == 3)
+                    {
+                        string user = info[0];
+                        string ip = info[1];
+                        int port = int.Parse(info[2]);
+                        IPEndPoint addr = new IPEndPoint(IPAddress.Parse(ip), port);
+                        if (userinfo.ContainsKey(user))
+                            userinfo.Remove(user);
+                        userinfo.Add(user, addr);
+                        Console.WriteLine("用户: " + user + " 登录服务器 IP: " + ip + " 端口: " + port);
+                    }
+                }
+            }
+            catch (Exception)
+            {
+                client.Close();
+            }
+
+        }
+    }
+}