__doPostback在客户端控件中的作用

前台代码如下：

  

   <%
   @ Page Language
   =
   "
   C#
   "
    AutoEventWireup
   =
   "
   true
   "
    CodeFile
   =
   "
   Default.aspx.cs
   "
    Inherits
   =
   "
   _Default
   "
    
   %>
   


   <!
   DOCTYPE html PUBLIC 
   "
   -//W3C//DTD XHTML 1.0 Transitional//EN
   "
    
   "
   http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
   "
   >
   


   <
   html xmlns
   =
   "
   http://www.w3.org/1999/xhtml
   "
   >
   

   <
   head runat
   =
   "
   server
   "
   >
   
 
   <
   title
   ></
   title
   >
   

   </
   head
   >
   

   <
   body
   >
   
 
   <
   form id
   =
   "
   form1
   "
    runat
   =
   "
   server
   "
   >
   
 
   <
   div
   >
   
 
   <
   asp:LinkButton ID
   =
   "
   LinkButton1
   "
    runat
   =
   "
   server
   "
   ></
   asp:LinkButton
   >
   
 
   <
   input type
   =
   "
   button
   "
    id
   =
   "
   thisTestBtn
   "
    value
   =
   "
   客户端控件
   "
    onclick
   =
   "
   javascript:__doPostBack('thisTestBtn','这就是按钮的内容！')
   "
    
   />
   
 
   </
   div
   >
   
 
   </
   form
   >
   

   </
   body
   >
   

   </
   html
   >
  

后台代码如下：

  

   using
    System;

   using
    System.Collections.Generic;

   using
    System.Linq;

   using
    System.Web;

   using
    System.Web.UI;

   using
    System.Web.UI.WebControls;


   public
    
   partial
    
   class
    _Default : System.Web.UI.Page 
{
 
   protected
    
   void
    Page_Load(
   object
    sender, EventArgs e)
 {
 
   if
    (IsPostBack)
 {
 
   string
    targetID 
   =
    Request.Params[
   "
   __EVENTTARGET
   "
   ];
 
   string
    args 
   =
    Request.Params[
   "
   __EVENTARGUMENT
   "
   ];
 Response.Write(
   "
   客户端按钮的ID为：
   "
   +
   targetID
   +
   "
   <br/>
   "
   );
 Response.Write(
   "
   客户端按钮回传的值为：
   "
   +
   args);
 }
 }
}
  

得到的结果为：

客户端按钮的ID为：thisTestBtn
客户端按钮回传的值为：这就是按钮的内容！