ASP.NET整个Postback程序处理的过程

我们知道，无论是ASP.NET1.x, 2.0，甚至是以后的版本，ASP.NET最终Render到Client端通过浏览器浏览的都是一样：一个单纯的HTML。Client通过 Submit Form的方式将填入Form的数据提交给Server进行处理。我们现在来看看ASP.NET整个Postback程序处理的过程。

首先我们通过一个Sample来看ASP.NET如何处理一个通过Click一个Button引起的Postback。下面是Web Page的HTML：

 
 
 
  
  
  <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
Inherits="_Default" %> 
  
  
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
  
  
   xmlns="http://www.w3.org/1999/xhtml"> 

  
  
   runat="server"> 

  
  
  </font></strong>Test Page<strong><font> 
  
  
   
  
  
   
  
  
   id="form1" runat="server"> 

  
  
   
  
  
   runat="server" ID="LabelMessage" ForeColor="red">

runat="server" ID="Button1" Text="Button1" OnClick="Button1_Click"
OnCommand="Button_Command" CommandArgument="Button1" />

runat="server" ID="Button2" Text="Button2" OnClick="Button2_Click"
OnCommand="Button_Command" CommandArgument="Button2" UseSubmitBehavior="false" />

runat="server" ID="Button3" Text="Button3" OnClick="Button3_Click"
OnCommand="Button_Command" CommandArgument="Button3" UseSubmitBehavior="false" />

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string message = string.Format("The {0} event of {1} is fired", "Click", "Button1");
this.LabelMessage.Text = message;
}
protected void Button2_Click(object sender, EventArgs e)
{
string message = string.Format("The {0} event of {1} is fired", "Click", "Button2");
this.LabelMessage.Text = message;
}
protected void Button3_Click(object sender, EventArgs e)
{
string message = string.Format("The {0} event of {1} is fired", "Click", "Button3");
this.LabelMessage.Text = message;
}
protected void Button_Command(object sender, CommandEventArgs e)
{
string message = string.Format("The {0} event of {1} is fired",
"Command", e.CommandArgument);
this.LabelMessage.Text += "; " + message;
}
}