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.Threading; 
using System.Net.Sockets; 
using System.Net; 
using System.IO; 
 
namespace TCP 
{ 
  public partial class TcpListenerTest : Form 
  { 
    public TcpListenerTest() 
    { 
      InitializeComponent(); 
    } 
    //聲明 
    private IPAddress localAddress;// IP地址 IPAddress類 在命名空間 using System.Net下 
    private const int port = 58080;//端口 
    private TcpListener tcpListener;//監(jiān)聽套接字 TcpLestener與TcpClient類 在命名空間 using System.Net.Sockets下 
    private TcpClient tcpClient;//服務(wù)端與客戶端建立連接 
    private NetworkStream newworkStream;//利用NetworkStream對象與遠(yuǎn)程主機(jī)發(fā)送數(shù)據(jù)或接收數(shù)據(jù)\ 
    private BinaryReader binaryReader;//讀取 BinaryReader與BinaryWriter類在命名空間using System.IO下 
    private BinaryWriter binaryWrite;//寫入 
    private void Form1_Load(object sender, EventArgs e) 
    { 
      IPAddress[] listenerIp = Dns.GetHostAddresses("www.baidu.com");//返回主機(jī)指定的IP地址 
      localAddress = listenerIp[0]; //初始化IP地址為本地地址 
      tcpListener = new TcpListener(localAddress,port);//創(chuàng)建TcpListener對象 
      tcpListener.Start();//開始監(jiān)聽 
 
      Thread thread = new Thread(AcceptClientConnect);//啟動(dòng)一個(gè)線程接收請求 
      thread.Start();//啟動(dòng)線程 
    } 
    //發(fā)起請求 
    private void AcceptClientConnect() 
    {  
      while(true) 
      { 
        try 
        { 
          tcpClient = tcpListener.AcceptTcpClient();//從端口接收一個(gè)連接，并賦予它TcpClient對象 
          if (tcpClient != null) 
          { 
            newworkStream = tcpClient.GetStream(); 
            binaryReader = new BinaryReader(newworkStream); 
            binaryWrite = new BinaryWriter(newworkStream); 
          } 
 
        } 
        catch 
        { 
          break; 
        } 
      } 
    } 
  } 
} 

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.Sockets; 
using System.Net; 
using System.IO; 
 
namespace TCP 
{ 
  public partial class TcpClientTest : Form 
  { 
    public TcpClientTest() 
    { 
      InitializeComponent(); 
    } 
    private TcpClient tcpClient;//聲明 
    private IPAddress iAdress;//IP地址 
    private const int port=58080; //端口  
    private NetworkStream networkStream;//網(wǎng)絡(luò)流 
    private BinaryReader binayRead;//讀取 
    private BinaryWriter binayWrite;//寫入 
    private void TcpClient_Load(object sender, EventArgs e) 
    { 
      IPAddress[] ipAddress = Dns.GetHostAddresses("www.baidu.com");//返回主機(jī)指定的IP地址 
      iAdress = ipAddress[0]; //初始化IP地址為本地地址 
      IPEndPoint ipoint = new IPEndPoint(iAdress,port);//將網(wǎng)絡(luò)端點(diǎn)表示為IP和端口號 
      tcpClient = new TcpClient(ipoint);//實(shí)例化TcpClient類 
      //最方便 TcpClient tcpClient=new TcpClient("www.baidu.com",port); 
 
      if (tcpClient != null) 
      { 
        networkStream = tcpClient.GetStream();//得到網(wǎng)絡(luò)流 
        binayRead = new BinaryReader(networkStream); 
        binayWrite = new BinaryWriter(networkStream); 
      } 
    } 
 
    private void ReMessage() 
    { 
      while (true) 
      { 
        try 
        { 
          string rcMsg = binayRead.ReadString();//從網(wǎng)絡(luò)流中讀取數(shù)據(jù) 
          if (rcMsg != null) 
          { 
            MessageBox.Show(rcMsg); 
          } 
          else 
          { 
            break; 
          } 
        } 
        catch 
        { 
  
        } 
      } 
    } 
  } 
}