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__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);
        }
    }
}