页面后退时如何运行Page_Load [英] How to run Page_Load when page backs

问题描述

你好，

我在Page_Load(object sender，EventArgs e)中有一个生成一些动态html代码的方法.
将页面导航到另一个页面后，当我单击IE的后退按钮时，将没有生成的html.问题是Page_Load不再运行.

我该如何解决这个问题.

Hello,

I have a method in Page_Load(object sender, EventArgs e) that generates some dynamic html codes.
After navigating the page to another page, When I click the back button of my IE, I wont have my generated html. The problem is Page_Load doesn''t run again.

How can I solve this problem.

protected void Page_Load(object sender, EventArgs e)
{
    CreateHTMLControls();
}

推荐答案

将此代码放在Page_Load事件中:

Hi,

Place this code in Page_Load event:

Response.CacheControl = "no-cache";
Response.AddHeader("Pragma", "no-cache");
Response.Expires = -1;

问候
Joachim

Regards
Joachim

执行页面的原因并不影响页面周期，在执行页面时始终会触发Load事件.

因此，如果Page_Load有时不运行，那是因为页面已缓存并且不在服务器上执行.可以将页面缓存在浏览器中，途中某处的路由器中，或者使用服务器端页面缓存在服务器上缓存

尝试禁用输出缓存，看看问题是否仍然出现:

The reason for the page executing doesn''t affect the page cycle, the Load event always fires when the page is executed.

So, if the Page_Load doesn''t run sometimes, it is because the page is cached and doesnt execute on the server. The page can be cached in the browser, in a router somewhere along the way, or on the server using server side page caching

Try disabling output cache and see if the problem still occurs:

<system.web>   
  <caching>     
   <outputCache enableOutputCache="false"/>
  </caching> 
<system.web>

作为替代方案，在Page_Load方法中添加以下代码以保留后退操作的内容.

As an alternative, add the below code in Page_Load method to retain the content on back operation.

if (this.Master.Page.Header != null && Session["RELOAD"] == null) 
{ 
 System.Web.UI.HtmlControls.HtmlHead hh = this.Master.Page.Header; 
 System.Web.UI.HtmlControls.HtmlMeta hm = new System.Web.UI.HtmlControls.HtmlMeta(); 
 hm.Attributes.Add("http-equiv", "Refresh"); 
 hm.Attributes.Add("content", "3"); 
 hh.Controls.Add(hm); 
}

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