C# 类似QQ通讯

using  System; 
using  System.Collections.Generic; 
using  System.Text; 
using  System.Net; 
using  System.IO; 
using  System.Net.Sockets; 
using  System.Threading; 

namespace  MyQQSer 
{ 
    class Serv 
    { 
        private TcpListener listenr; 
        private Thread thread; 
        private bool isClose = false;    //结束程序是退出循环 
        private Socket[] sock = new Socket[50]; 

        public Serv() 
        { 
            Listener(); 
        } 

        ~Serv() 
        { 
            isClose = true; 
            for (int i = 0; i < sock.Length; i++) 
            { 
                if (sock[i] != null) 
                    sock[i].Close(); 
                listenr.Stop(); 
            } 
        } 

        /**//// <summary> 
        /// 开始监听端口 
        /// </summary> 
        public void Listener() 
        { 
            if (listenr == null) 
                listenr = new TcpListener(IPAddress.Parse("127.0.0.1"), 5000); 
            listenr.Start(); 
            if (thread == null) 
                thread = new Thread(new ThreadStart(ReciverMessage)); 
            thread.IsBackground = true; 
            thread.Start(); 
        } 

        /**//// <summary> 
        /// 接收数据 
        /// </summary> 
        private void ReciverMessage() 
        { 
            int count; //可用套结字索引 
            count = GetCount(); 
            bool loop = true; 
            if (count == -1) 
                loop = false; 
            if (loop) 
            { 
                while (true) 
                { 
                    // 判断是否退出循环 
                    if (isClose) 
                        break;                    
                    sock[count] = listenr.AcceptSocket(); 
                    Thread t = new Thread(new ThreadStart(ReciverMessage)); 
                    t.IsBackground = true; 
                    t.Start(); 
                    // 接受客户端数据 
                    while (true) 
                    { 
                        byte[] buffs = new byte[100]; 
                        if (sock[count].Connected) 
                        { 
                            try 
                            { 
                                sock[count].Receive(buffs); 
                                string message = Encoding.Default.GetString(buffs); 
                                Console.WriteLine(message); 
                                SendToAll(buffs); 
                            } 
                            catch (Exception ex) 
                            { 

                            } 
                        } 
                    } 
                } 
            } 
            Thread.CurrentThread.Abort(); 
        } 

        // 得到可用套结字索引 
        private int GetCount() 
        { 
            for (int i = 0; i < sock.Length; i++) 
                if (sock[i] == null) 
                    return i; 
            return -1; 
        } 

        // 发送消息给所有人 
        private void SendToAll(byte[] buff) 
        { 
            for (int i = 0; i < sock.Length; i++) 
            { 
                if (sock[i] != null) 
                { 
                    if (sock[i].Connected) 
                    { 
                        sock[i].Send(buff); 
                    } 
                } 
            } 
        } 
    } 
}  

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

namespace  TestClient 
{ 
    public partial class Form1 : Form 
    { 
        private TcpClient client; 
        private Thread t; 
        private Socket sock; 
        private bool close = false; 

        public Form1() 
        { 
            InitializeComponent(); 
        } 

        // 连接 
        private void btnConnect_Click(object sender, EventArgs e) 
        { 
            if(client == null) 
                client = new TcpClient(new IPEndPoint(IPAddress.Parse("127.0.0.1"), int.Parse(txtLoalPort.Text))); 

            if (t == null) 
                t = new Thread(new ThreadStart(ReciverMessage)); 
            t.IsBackground = true; 
            t.Start(); 
            btnSend.Enabled = true; 
            btnConnect.Enabled = false; 
        } 
        
        // 接收消息 
        private void ReciverMessage() 
        { 
            client.Connect(IPAddress.Parse(txtSerIP.Text), int.Parse(txtSerPort.Text)); 
            while (true) 
            { 
                if (close) 
                    break; 
                    //NetworkStream nws = client.GetStream(); 
                    //StreamReader sr = new StreamReader(nws); 
                    //string message = sr.ReadToEnd(); 
                    //sr.Close(); 
                    if(sock == null) 
                            sock = client.Client; 
                    byte[] buff = new byte[100]; 
                    sock.Receive(buff); 
                    string message = Encoding.Default.GetString(buff); 
                    this.lstMessage.Items.Add(message);                
            } 
            Thread.CurrentThread.Abort(); 
        } 

        // 发送消息 
        private void btnSend_Click(object sender, EventArgs e) 
        { 
            string message = this.txtInput.Text; 
            byte[] buff = Encoding.Default.GetBytes(message); 
            sock.Send(buff); 
            txtInput.Text = ""; 
        } 

        private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
        { 
            close = true; 
            sock.Close(); 
        } 
    } 
}