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asp.net页面的加载顺序

2010-05-18 13:37 211 查看

页面加载顺序如下:

Page.Init

Page.Load

Textbox.TextChanged

Button.Click

Page.PreRender

Page.Unload

在Page.Unload之前,页面就呈现出来了.

page.init只是在页面第一次载入的时候执行,当页面postback后从page.load开始执行.

e.g

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication8._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:Label ID="lbl" runat="server"></asp:Label>
<br />
<asp:Button ID="btn" runat="server" onclick="btn_Click" />
</div>
</form>
</body>
</html>

C#代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication8
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
lbl.Text += "pageload is on.<br />";
else
lbl.Text += "This is not your first.<br />";
}
protected void Page_Init(object sender, EventArgs e)
{
lbl.Text += "pageinit is on.<br />";
}
protected void Page_PreRender(object sender, EventArgs e)
{
lbl.Text += "pageprerender is on.<br />";
}
protected void btn_Click(object sender, EventArgs e)
{
lbl.Text += "button is on.<br />";
}
}
}

执行结果:(点击了button后)

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