Socket 服務器端與客戶端例子（多線程模式）

服務器端：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
namespace MySocketServerCon
{
    public  class Serverlicten
    {
        IPAddress ipadr;
        IPEndPoint ipep;
        Socket serverSocket;
        Socket clientSocket;
        int port = 8888;
        //客戶端線程
        Thread clientThread;
        public void Start()
        {
            ipadr = IPAddress.Parse("127.0.0.1");
            ipep = new IPEndPoint(ipadr, port);
            serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //綁定終結點
            serverSocket.Bind(ipep);
            serverSocket.Listen(10);//排隊10個
            Console.WriteLine("listening 127.0.0.1:8888 ");
            //偵聽
            while (true)
            {
                try
                {
                 
                    clientSocket = serverSocket.Accept();
                    //來一個啓動一個線程
                    ThreadStart ts = new ThreadStart(RecievData);
                    clientThread = new Thread(ts);
                    clientThread.Start();
                  
                }
                catch (Exception ex)
                {
                    Console.WriteLine("listening Error: " + ex.Message);
                }
            }
        }
        void RecievData()
        {

            Socket s = this.clientSocket;

            //根據受到客戶端的套接字發送返回消息
            IPEndPoint clientep = (IPEndPoint)s.RemoteEndPoint;
            //記錄請求IP
            //lstServer.Items.Add("Client：" + clientep.Address + "(" + clientep.Port + ")");
            Console.WriteLine("Client：" + clientep.Address + "(" + clientep.Port + ")");
            //***************************************************************************
            //回發消息
            string welcome = "Welcome to my sever";
            byte[] data = new byte[1024];
            data = Encoding.ASCII.GetBytes(welcome);
            //發給客戶端
            s.Send(data);

            //***************************************************************************
            //在套接字上接收客戶端發送的信息
            bool keepalive = true;
            byte[] buffer = new byte[1024];
            while (keepalive)
            {
                int bufLen = 0;
                try
                {
                    //獲取已經從網絡接收且可供讀取的數據量。
                    bufLen = s.Available;
                    //獲取信息
                    s.Receive(buffer, 0, bufLen, SocketFlags.None);
                    //繼續等
                    if (bufLen == 0)
                        continue;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Receive Error:" + ex.Message);
                   
                    return;
                }

                //記錄收到的信息i
                clientep = (IPEndPoint)s.RemoteEndPoint;
                string clientcommand = System.Text.Encoding.ASCII.GetString(buffer).Substring(0, bufLen);
                //lstServer.Items.Add(clientcommand + "(" + clientep.Address + ":" + clientep.Port + ")");
                 Console.WriteLine(clientcommand + "(" + clientep.Address + ":" + clientep.Port + ")");

                 //回發收到的消息               
                 data = Encoding.ASCII.GetBytes(clientep.Address +" Say:"+clientcommand);
                 //發給客戶端
                 s.Send(data);
            }
        }

    }
}

===========================================

客戶端

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;

namespace MySocketClient
{
    public partial class Form1 : Form
    {
        //代理控件
        delegate void listboxDel(string s);
        listboxDel listboxdel;
        void LoadListBox(string s)
        {
            lstClient.Items.Add(s);
        }

        public Form1()
        {
            InitializeComponent();
            listboxdel = new listboxDel(LoadListBox);
        }
        Socket clientSocket;
        byte[] data = new byte[1024];

       

        private void Form1_Load(object sender, EventArgs e)
        {
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8888);
            clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //將套接字與遠程服務器地址相連
            try
            {
                clientSocket.Connect(ipep);
            }
            catch (SocketException ex)
            {
                MessageBox.Show("connect error: " + ex.Message);
                return;
            }

           

        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                byte[] data = new byte[1024];
                data = Encoding.ASCII.GetBytes(txtClient.Text);
                clientSocket.Send(data, data.Length, SocketFlags.None);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Receive Error:" + ex.Message);
                return;
            }

            //接受信息
            while (true)
            {
                int bufLen = 0;
                try
                {
                  
                    bufLen = clientSocket.Available;//返回內容的大小
                    if (bufLen == 0)
                        break ;

                    clientSocket.Receive(data, 0, bufLen, SocketFlags.None);
                    //if (bufLen == 0)
                    //    continue;

                }
                catch (Exception ex)
                {
                    MessageBox.Show("Receive Error:" + ex.Message);
                    return;
                }
                //加入
                string clientcommand = System.Text.Encoding.ASCII.GetString(data).Substring(0, bufLen);
                //lstClient.Items.Add(clientcommand);
                lstClient.Invoke(listboxdel, clientcommand);
            }
        }
    }
}