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(); 
    } 
    //声明 
    private IPAddress localAddress;// IP地址 IPAddress类 在命名空间 using System.Net下 
    private const int port = 58080;//端口 
    private TcpListener tcpListener;//监听套接字 TcpLestener与TcpClient类 在命名空间 using System.Net.Sockets下 
    private TcpClient tcpClient;//服务端与客户端建立连接 
    private NetworkStream newworkStream;//利用NetworkStream对象与远程主机发送数据或接收数据\ 
    private BinaryReader binaryReader;//读取 BinaryReader与BinaryWriter类在命名空间using System.IO下 
    private BinaryWriter binaryWrite;//写入 
    private void Form1_Load(object sender, EventArgs e) 
    { 
      IPAddress[] listenerIp = Dns.GetHostAddresses("www.baidu.com");//返回主机指定的IP地址 
      localAddress = listenerIp[0]; //初始化IP地址为本地地址 
      tcpListener = new TcpListener(localAddress,port);//创建TcpListener对象 
      tcpListener.Start();//开始监听 
 
      Thread thread = new Thread(AcceptClientConnect);//启动一个线程接收请求 
      thread.Start();//启动线程 
    } 
    //发起请求 
    private void AcceptClientConnect() 
    {  
      while(true) 
      { 
        try 
        { 
          tcpClient = tcpListener.AcceptTcpClient();//从端口接收一个连接，并赋予它TcpClient对象 
          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;//声明 
    private IPAddress iAdress;//IP地址 
    private const int port=58080; //端口  
    private NetworkStream networkStream;//网络流 
    private BinaryReader binayRead;//读取 
    private BinaryWriter binayWrite;//写入 
    private void TcpClient_Load(object sender, EventArgs e) 
    { 
      IPAddress[] ipAddress = Dns.GetHostAddresses("www.baidu.com");//返回主机指定的IP地址 
      iAdress = ipAddress[0]; //初始化IP地址为本地地址 
      IPEndPoint ipoint = new IPEndPoint(iAdress,port);//将网络端点表示为IP和端口号 
      tcpClient = new TcpClient(ipoint);//实例化TcpClient类 
      //最方便 TcpClient tcpClient=new TcpClient("www.baidu.com",port); 
 
      if (tcpClient != null) 
      { 
        networkStream = tcpClient.GetStream();//得到网络流 
        binayRead = new BinaryReader(networkStream); 
        binayWrite = new BinaryWriter(networkStream); 
      } 
    } 
 
    private void ReMessage() 
    { 
      while (true) 
      { 
        try 
        { 
          string rcMsg = binayRead.ReadString();//从网络流中读取数据 
          if (rcMsg != null) 
          { 
            MessageBox.Show(rcMsg); 
          } 
          else 
          { 
            break; 
          } 
        } 
        catch 
        { 
  
        } 
      } 
    } 
  } 
}