TCP網路通訊的簡單例子

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Runtime.Remoting.Messaging;
namespace WindowsApplication8
{
 /// <summary>
 /// Form1 的摘要說明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.TextBox textBox1;
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.Button button3;
  /// <summary>
  /// 必需的設計器變數。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Windows 表單設計器支援所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 調用後添加任何建構函式代碼
   //
  }

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

  #region Windows 表單設計器產生的程式碼
  /// <summary>
  /// 設計器支援所需的方法 - 不要使用代碼編輯器修改
  /// 此方法的內容。
  /// </summary>
  private void InitializeComponent()
  {
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.button1 = new System.Windows.Forms.Button();
   this.button3 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // textBox1
   //
   this.textBox1.Dock = System.Windows.Forms.DockStyle.Top;
   this.textBox1.Location = new System.Drawing.Point(0, 0);
   this.textBox1.Multiline = true;
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(464, 184);
   this.textBox1.TabIndex = 0;
   this.textBox1.Text = "textBox1";
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(0, 192);
   this.button1.Name = "button1";
   this.button1.TabIndex = 1;
   this.button1.Text = "監 聽";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // button3
   //
   this.button3.Location = new System.Drawing.Point(88, 192);
   this.button3.Name = "button3";
   this.button3.TabIndex = 4;
   this.button3.Text = "關 閉";
   this.button3.Click += new System.EventHandler(this.button3_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(464, 222);
   this.Controls.Add(this.button3);
   this.Controls.Add(this.button1);
   this.Controls.Add(this.textBox1);
   this.Name = "Form1";
   this.Text = "Form1";
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 應用程式的主進入點。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }
  private StreamReader sr;
  private Socket s;
  delegate string myRead();
  private void button1_Click(object sender, System.EventArgs e)
  {
   TcpListener tl = new TcpListener(7878);
   tl.Start();
   s = tl.AcceptSocket();
   NetworkStream ns = new NetworkStream(s);
   sr = new StreamReader(ns);
   myRead m = new myRead(sr.ReadLine);
   AsyncCallback a = new AsyncCallback(myCallBack);
   m.BeginInvoke(a,null);
  }
  void myCallBack(IAsyncResult ar)
  {
   AsyncResult arr = ar as AsyncResult;
   myRead m = arr.AsyncDelegate as myRead;
   this.textBox1.Text += (s.RemoteEndPoint as IPEndPoint).Address.ToString() + ":" + m.EndInvoke(ar)+"/r/n";
   m.BeginInvoke(new AsyncCallback(this.myCallBack),null);
  }
  private void button3_Click(object sender, System.EventArgs e)
  {
   sr.Close();
   s.Close();
  }
 }
}