Donet网络编程备课笔记

一 System.Net和System.Net.Socket命名空间介绍
二 WebRequest、WebResponse、WebProxy、HttpWebRequest、HttpWebResponse类介绍
三 举例（见MSDN同步HttpWebRequest示例）
四 TcpClient介绍以及举例(见例2)
五 TcpListener介绍以及举例(见例子3)
六 UdpClient介绍以及举例(见例子4)
七 Socket介绍以及举例(见MSDN同步套接字示例)
八 代码部分：
////////////////
例（2）WinForm程序
////////////////
private void button1_Click(object sender, System.EventArgs e)
{
 string server="teachera";
 TcpClient tcpclient=new TcpClient();
 //连接
 tcpclient.Connect("teachera",80);
 NetworkStream ns=tcpclient.GetStream();
 StreamReader sr=new StreamReader(ns,Encoding.Default);
 StreamWriter sw=new StreamWriter(ns);
 //发送数据
 string s = "GET / HTTP/1.1\r\nHost: " + server +
  "\r\nConnection: Close\r\n\r\n";
 sw.Write(s);
 sw.Flush();
 //接收数据
 textBox1.Text=sr.ReadToEnd();
 tcpclient.Close();
}
////////////////
例（3）客户端 WinForm程序
////////////////
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Net.Sockets;
using System.IO;
using System.Text;

namespace TcpClientTest
{
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.TextBox txtServer;
  private System.Windows.Forms.Button btnConnect;
  private System.Windows.Forms.TextBox txtPort2;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.Button btnSend2;
  private System.Windows.Forms.TextBox txtSend2;
  private System.Windows.Forms.Label label4;
  private System.Windows.Forms.TextBox txtReceive2;
  private System.Windows.Forms.Button btnReceive2;
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   InitializeComponent();
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.btnConnect = new System.Windows.Forms.Button();
   this.txtPort2 = new System.Windows.Forms.TextBox();
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.txtServer = new System.Windows.Forms.TextBox();
   this.label3 = new System.Windows.Forms.Label();
   this.txtSend2 = new System.Windows.Forms.TextBox();
   this.btnSend2 = new System.Windows.Forms.Button();
   this.label4 = new System.Windows.Forms.Label();
   this.txtReceive2 = new System.Windows.Forms.TextBox();
   this.btnReceive2 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // btnConnect
   //
   this.btnConnect.Location = new System.Drawing.Point(480, 8);
   this.btnConnect.Name = "btnConnect";
   this.btnConnect.Size = new System.Drawing.Size(72, 24);
   this.btnConnect.TabIndex = 5;
   this.btnConnect.Text = "连接";
   this.btnConnect.Click += new System.EventHandler(this.btnConnect_Click);
   //
   // txtPort2
   //
   this.txtPort2.Location = new System.Drawing.Point(360, 8);
   this.txtPort2.Name = "txtPort2";
   this.txtPort2.Size = new System.Drawing.Size(112, 21);
   this.txtPort2.TabIndex = 4;
   this.txtPort2.Text = "1000";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(280, 8);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(72, 24);
   this.label1.TabIndex = 3;
   this.label1.Text = "端口号";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(8, 8);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(72, 16);
   this.label2.TabIndex = 6;
   this.label2.Text = "机器名";
   //
   // txtServer
   //
   this.txtServer.Location = new System.Drawing.Point(96, 8);
   this.txtServer.Name = "txtServer";
   this.txtServer.Size = new System.Drawing.Size(176, 21);
   this.txtServer.TabIndex = 7;
   this.txtServer.Text = "teachera";
   //
   // label3
   //
   this.label3.Location = new System.Drawing.Point(8, 40);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(80, 24);
   this.label3.TabIndex = 8;
   this.label3.Text = "待发送数据";
   //
   // txtSend2
   //
   this.txtSend2.Location = new System.Drawing.Point(96, 40);
   this.txtSend2.Name = "txtSend2";
   this.txtSend2.Size = new System.Drawing.Size(376, 21);
   this.txtSend2.TabIndex = 9;
   this.txtSend2.Text = "Hello, I am Client!";
   //
   // btnSend2
   //
   this.btnSend2.Location = new System.Drawing.Point(480, 40);
   this.btnSend2.Name = "btnSend2";
   this.btnSend2.Size = new System.Drawing.Size(72, 24);
   this.btnSend2.TabIndex = 10;
   this.btnSend2.Text = "发送";
   this.btnSend2.Click += new System.EventHandler(this.btnSend2_Click);
   //
   // label4
   //
   this.label4.Location = new System.Drawing.Point(8, 72);
   this.label4.Name = "label4";
   this.label4.Size = new System.Drawing.Size(80, 24);
   this.label4.TabIndex = 11;
   this.label4.Text = "接收到数据";
   //
   // txtReceive2
   //
   this.txtReceive2.Location = new System.Drawing.Point(96, 72);
   this.txtReceive2.Name = "txtReceive2";
   this.txtReceive2.Size = new System.Drawing.Size(376, 21);
   this.txtReceive2.TabIndex = 12;
   this.txtReceive2.Text = "";
   //
   // btnReceive2
   //
   this.btnReceive2.Location = new System.Drawing.Point(480, 72);
   this.btnReceive2.Name = "btnReceive2";
   this.btnReceive2.Size = new System.Drawing.Size(72, 24);
   this.btnReceive2.TabIndex = 13;
   this.btnReceive2.Text = "接收";
   this.btnReceive2.Click += new System.EventHandler(this.btnReceive2_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(568, 381);
   this.Controls.Add(this.btnReceive2);
   this.Controls.Add(this.txtReceive2);
   this.Controls.Add(this.label4);
   this.Controls.Add(this.btnSend2);
   this.Controls.Add(this.txtSend2);
   this.Controls.Add(this.label3);
   this.Controls.Add(this.txtServer);
   this.Controls.Add(this.label2);
   this.Controls.Add(this.btnConnect);
   this.Controls.Add(this.txtPort2);
   this.Controls.Add(this.label1);
   this.Name = "Form1";
   this.Text = "客户端 ";
   this.ResumeLayout(false);

  }
  #endregion
  TcpClient tcpclient;
  NetworkStream ns;
  StreamReader sr;
  StreamWriter sw;
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  //连接
  private void btnConnect_Click(object sender, System.EventArgs e)
  {
   tcpclient=new TcpClient();
   tcpclient.Connect(txtServer.Text,int.Parse(txtPort2.Text));
   ns=tcpclient.GetStream();
   sr=new StreamReader(ns);
   sw=new StreamWriter(ns);
  }

  //客户端发送数据
  private void btnSend2_Click(object sender, System.EventArgs e)
  {
   sw.WriteLine(txtSend2.Text);
   sw.Flush();
  }

  //客户端接收
  private void btnReceive2_Click(object sender, System.EventArgs e)
  {
   txtReceive2.Text=sr.ReadLine();
  }
 }
}
////////////////
例（3）服务器端,WinForm程序
////////////////
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net.Sockets;
using System.IO;
using System.Text;
using System.Net;

namespace TcpServerTest
{
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.TextBox txtPort1;
  private System.Windows.Forms.Button btnListen;
  private System.Windows.Forms.Button btnAccecp;
  private System.Windows.Forms.Button btnReceive1;
  private System.Windows.Forms.TextBox txtReceive1;
  private System.Windows.Forms.Label label4;
  private System.Windows.Forms.Button btnSend1;
  private System.Windows.Forms.TextBox txtSend1;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.ListBox listBox1;
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.label1 = new System.Windows.Forms.Label();
   this.txtPort1 = new System.Windows.Forms.TextBox();
   this.btnListen = new System.Windows.Forms.Button();
   this.btnAccecp = new System.Windows.Forms.Button();
   this.btnReceive1 = new System.Windows.Forms.Button();
   this.txtReceive1 = new System.Windows.Forms.TextBox();
   this.label4 = new System.Windows.Forms.Label();
   this.btnSend1 = new System.Windows.Forms.Button();
   this.txtSend1 = new System.Windows.Forms.TextBox();
   this.label3 = new System.Windows.Forms.Label();
   this.listBox1 = new System.Windows.Forms.ListBox();
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(16, 8);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(72, 24);
   this.label1.TabIndex = 0;
   this.label1.Text = "端口号";
   //
   // txtPort1
   //
   this.txtPort1.Location = new System.Drawing.Point(96, 8);
   this.txtPort1.Name = "txtPort1";
   this.txtPort1.Size = new System.Drawing.Size(112, 21);
   this.txtPort1.TabIndex = 1;
   this.txtPort1.Text = "1000";
   //
   // btnListen
   //
   this.btnListen.Location = new System.Drawing.Point(224, 8);
   this.btnListen.Name = "btnListen";
   this.btnListen.Size = new System.Drawing.Size(72, 24);
   this.btnListen.TabIndex = 2;
   this.btnListen.Text = "侦听";
   this.btnListen.Click += new System.EventHandler(this.btnListen_Click);
   //
   // btnAccecp
   //
   this.btnAccecp.Location = new System.Drawing.Point(312, 8);
   this.btnAccecp.Name = "btnAccecp";
   this.btnAccecp.Size = new System.Drawing.Size(64, 24);
   this.btnAccecp.TabIndex = 3;
   this.btnAccecp.Text = "接受连接 ";
   this.btnAccecp.Click += new System.EventHandler(this.btnAccecp_Click);
   //
   // btnReceive1
   //
   this.btnReceive1.Location = new System.Drawing.Point(480, 72);
   this.btnReceive1.Name = "btnReceive1";
   this.btnReceive1.Size = new System.Drawing.Size(72, 24);
   this.btnReceive1.TabIndex = 19;
   this.btnReceive1.Text = "接收";
   this.btnReceive1.Click += new System.EventHandler(this.btnReceive1_Click);
   //
   // txtReceive1
   //
   this.txtReceive1.Location = new System.Drawing.Point(96, 72);
   this.txtReceive1.Name = "txtReceive1";
   this.txtReceive1.Size = new System.Drawing.Size(376, 21);
   this.txtReceive1.TabIndex = 18;
   this.txtReceive1.Text = "";
   //
   // label4
   //
   this.label4.Location = new System.Drawing.Point(8, 72);
   this.label4.Name = "label4";
   this.label4.Size = new System.Drawing.Size(80, 24);
   this.label4.TabIndex = 17;
   this.label4.Text = "接收到数据";
   //
   // btnSend1
   //
   this.btnSend1.Location = new System.Drawing.Point(480, 40);
   this.btnSend1.Name = "btnSend1";
   this.btnSend1.Size = new System.Drawing.Size(72, 24);
   this.btnSend1.TabIndex = 16;
   this.btnSend1.Text = "发送";
   this.btnSend1.Click += new System.EventHandler(this.btnSend1_Click);
   //
   // txtSend1
   //
   this.txtSend1.Location = new System.Drawing.Point(96, 40);
   this.txtSend1.Name = "txtSend1";
   this.txtSend1.Size = new System.Drawing.Size(376, 21);
   this.txtSend1.TabIndex = 15;
   this.txtSend1.Text = "Hello, I am  Server!";
   //
   // label3
   //
   this.label3.Location = new System.Drawing.Point(8, 40);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(80, 24);
   this.label3.TabIndex = 14;
   this.label3.Text = "待发送数据";
   //
   // listBox1
   //
   this.listBox1.ItemHeight = 12;
   this.listBox1.Location = new System.Drawing.Point(24, 120);
   this.listBox1.Name = "listBox1";
   this.listBox1.Size = new System.Drawing.Size(536, 136);
   this.listBox1.TabIndex = 20;
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(608, 273);
   this.Controls.Add(this.listBox1);
   this.Controls.Add(this.btnReceive1);
   this.Controls.Add(this.txtReceive1);
   this.Controls.Add(this.label4);
   this.Controls.Add(this.btnSend1);
   this.Controls.Add(this.txtSend1);
   this.Controls.Add(this.label3);
   this.Controls.Add(this.btnAccecp);
   this.Controls.Add(this.btnListen);
   this.Controls.Add(this.txtPort1);
   this.Controls.Add(this.label1);
   this.Name = "Form1";
   this.Text = "服务器端";
   this.ResumeLayout(false);

  }
  #endregion
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  TcpListener tcplistener;
  Socket socketForClient;
  NetworkStream ns;
  StreamReader sr;
  StreamWriter sw;

  //侦听
  private void btnListen_Click(object sender, System.EventArgs e)
  {
   IPHostEntry hostInfo = Dns.GetHostByName("teachera");
   tcplistener=new TcpListener(hostInfo.AddressList[0],int.Parse(txtPort1.Text));
   tcplistener.Start();
   listBox1.Items.Add("开始侦听。。。");
  }
  //接受连接
  private void btnAccecp_Click(object sender, System.EventArgs e)
  {
   socketForClient=tcplistener.AcceptSocket();
   ns=new NetworkStream(socketForClient);
   sr=new StreamReader(ns);
   sw=new StreamWriter(ns);
   listBox1.Items.Add("已建立连接。。。");
  }
  //服务器接收数据
  private void btnReceive1_Click(object sender, System.EventArgs e)
  {
   string line=sr.ReadLine();
   txtReceive1.Text=line;
   listBox1.Items.Add("接收数据成功。。。");
  }
  //服务器发送数据
  private void btnSend1_Click(object sender, System.EventArgs e)
  {
   sw.WriteLine(txtSend1.Text);
   sw.Flush();
  }
 }
}
////////////////
例（4）客户端,WinForm程序
////////////////
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Net.Sockets;
using System.IO;
using System.Text;

namespace TcpClientTest
{
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.TextBox txtServer;
  private System.Windows.Forms.TextBox txtPort2;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.Button btnSend2;
  private System.Windows.Forms.TextBox txtSend2;
  private System.Windows.Forms.TextBox txtPort;
  private System.ComponentModel.Container components = null;
  public Form1()
  {
   InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.txtServer = new System.Windows.Forms.TextBox();
   this.label3 = new System.Windows.Forms.Label();
   this.txtSend2 = new System.Windows.Forms.TextBox();
   this.btnSend2 = new System.Windows.Forms.Button();
   this.txtPort = new System.Windows.Forms.TextBox();
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(280, 8);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(72, 24);
   this.label1.TabIndex = 3;
   this.label1.Text = "端口号";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(8, 8);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(72, 16);
   this.label2.TabIndex = 6;
   this.label2.Text = "机器名";
   //
   // txtServer
   //
   this.txtServer.Location = new System.Drawing.Point(96, 8);
   this.txtServer.Name = "txtServer";
   this.txtServer.Size = new System.Drawing.Size(176, 21);
   this.txtServer.TabIndex = 7;
   this.txtServer.Text = "teachera";
   //
   // label3
   //
   this.label3.Location = new System.Drawing.Point(8, 40);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(80, 24);
   this.label3.TabIndex = 8;
   this.label3.Text = "待发送数据";
   //
   // txtSend2
   //
   this.txtSend2.Location = new System.Drawing.Point(96, 40);
   this.txtSend2.Name = "txtSend2";
   this.txtSend2.Size = new System.Drawing.Size(376, 21);
   this.txtSend2.TabIndex = 9;
   this.txtSend2.Text = "Hello, I am Client!";
   //
   // btnSend2
   //
   this.btnSend2.Location = new System.Drawing.Point(480, 40);
   this.btnSend2.Name = "btnSend2";
   this.btnSend2.Size = new System.Drawing.Size(72, 24);
   this.btnSend2.TabIndex = 10;
   this.btnSend2.Text = "发送";
   this.btnSend2.Click += new System.EventHandler(this.btnSend2_Click);
   //
   // txtPort
   //
   this.txtPort.Location = new System.Drawing.Point(368, 8);
   this.txtPort.Name = "txtPort";
   this.txtPort.Size = new System.Drawing.Size(72, 21);
   this.txtPort.TabIndex = 11;
   this.txtPort.Text = "1000";
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(568, 381);
   this.Controls.Add(this.txtPort);
   this.Controls.Add(this.btnSend2);
   this.Controls.Add(this.txtSend2);
   this.Controls.Add(this.label3);
   this.Controls.Add(this.txtServer);
   this.Controls.Add(this.label2);
   this.Controls.Add(this.label1);
   this.Name = "Form1";
   this.Text = "客户端 ";
   this.ResumeLayout(false);

  }
  #endregion
  
  UdpClient udpclient;
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  //客户端发送
  private void btnSend2_Click(object sender, System.EventArgs e)
  {
   //转换成字节数组
   string str=txtSend2.Text;
   byte[] sds=Encoding.ASCII.GetBytes(str);

   udpclient=new UdpClient();
   udpclient.Send(sds,sds.Length,txtServer.Text,int.Parse(txtPort.Text));
  }
 }
}
////////////////
例（5）服务器端,WinForm程序
////////////////
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Net.Sockets;
using System.IO;
using System.Text;
using System.Net;

namespace TcpClientTest
{
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.TextBox txtPort2;
  private System.Windows.Forms.Label label4;
  private System.Windows.Forms.TextBox txtReceive2;
  private System.Windows.Forms.Button btnReceive2;
  private System.Windows.Forms.Button btnBind;
  private System.ComponentModel.Container components = null; 
  public Form1()
  {
   InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.btnBind = new System.Windows.Forms.Button();
   this.txtPort2 = new System.Windows.Forms.TextBox();
   this.label1 = new System.Windows.Forms.Label();
   this.label4 = new System.Windows.Forms.Label();
   this.txtReceive2 = new System.Windows.Forms.TextBox();
   this.btnReceive2 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // btnBind
   //
   this.btnBind.Location = new System.Drawing.Point(232, 8);
   this.btnBind.Name = "btnBind";
   this.btnBind.Size = new System.Drawing.Size(72, 24);
   this.btnBind.TabIndex = 5;
   this.btnBind.Text = "绑定";
   this.btnBind.Click += new System.EventHandler(this.btnBind_Click);
   //
   // txtPort2
   //
   this.txtPort2.Location = new System.Drawing.Point(104, 8);
   this.txtPort2.Name = "txtPort2";
   this.txtPort2.Size = new System.Drawing.Size(112, 21);
   this.txtPort2.TabIndex = 4;
   this.txtPort2.Text = "1000";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(8, 8);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(72, 24);
   this.label1.TabIndex = 3;
   this.label1.Text = "端口号";
   //
   // label4
   //
   this.label4.Location = new System.Drawing.Point(8, 48);
   this.label4.Name = "label4";
   this.label4.Size = new System.Drawing.Size(80, 24);
   this.label4.TabIndex = 11;
   this.label4.Text = "接收到数据";
   //
   // txtReceive2
   //
   this.txtReceive2.Location = new System.Drawing.Point(104, 48);
   this.txtReceive2.Name = "txtReceive2";
   this.txtReceive2.Size = new System.Drawing.Size(368, 21);
   this.txtReceive2.TabIndex = 12;
   this.txtReceive2.Text = "";
   //
   // btnReceive2
   //
   this.btnReceive2.Location = new System.Drawing.Point(480, 48);
   this.btnReceive2.Name = "btnReceive2";
   this.btnReceive2.Size = new System.Drawing.Size(72, 24);
   this.btnReceive2.TabIndex = 13;
   this.btnReceive2.Text = "接收";
   this.btnReceive2.Click += new System.EventHandler(this.btnReceive2_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(568, 381);
   this.Controls.Add(this.btnReceive2);
   this.Controls.Add(this.txtReceive2);
   this.Controls.Add(this.label4);
   this.Controls.Add(this.btnBind);
   this.Controls.Add(this.txtPort2);
   this.Controls.Add(this.label1);
   this.Name = "Form1";
   this.Text = "服务器端 ";
   this.ResumeLayout(false);

  }
  #endregion 
  UdpClient udpserver;
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  //绑定
  private void btnBind_Click(object sender, System.EventArgs e)
  {
   udpserver=new UdpClient(int.Parse(txtPort2.Text));
  }

  //服务器接收
  private void btnReceive2_Click(object sender, System.EventArgs e)
  {
   IPEndPoint remote=new IPEndPoint(IPAddress.Any,0);
   byte[] revs=udpserver.Receive(ref remote);
   txtReceive2.Text=Encoding.ASCII.GetString(revs);
  }
 }
}