在ASP.NET C＃中的页面加载上触发OnUnload代码 [英] OnUnload code firing on pageload in ASP.NET C#

问题描述

我正在使用c＃



在asp.net中准备一个网页我希望在页面加载时执行某些代码，并在页面卸载时执行其他一些代码。我的代码如下：

I am preparing a webpage in asp.net using c#

I want certain code to be executed on page load and some other code to be executed on page unload. My code is as follows:

protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            //code to be executed on page load when user enter the page           
        }
   }

// Other code for execution depending on user requirement 

protected override void OnUnload(EventArgs e)
    {
            base.OnUnload(e);
        
            // code to be executed on user leaves the page    
   }

我的问题是卸载的代码在pageload本身被触发，而我希望只有页面加载代码在页面加载时触发pageunload代码仅在用户离开页面时触发。



请通过告知我在代码中缺少的内容来帮助我



非常感谢帮助

My problem is that the code for unload gets fired on pageload itself whereas I expect only pageload code to fire at page load and pageunload code to fire only when user leaves the page.

Kindly help me by advising what I am missing in the code

Many thanks for help

推荐答案

With AutoEventWireup which is turned on by default on a page you can just add methods prepended with Page_event and have ASP.NET connect to the events for you.

In the case of Unload the method signature is:

protected void Page_Unload(object sender, EventArgs e)

So you need to write:

protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            //code to be executed on page load when user enter the page           
        }
   }
 
// Other code for execution depending on user requirement 

protected void Page_UnLoad(object sender, EventArgs e)
    {
            // code to be executed on user leaves the page    
   }

Actually Page_UnLoad event is rasied when the page is rendered and loaded completely at the end of its page life cycle.It is not just like you have done through form_closing event in windows form application.Instead you can detect browser close event and then call server side event using ajax.As shown like below

<script type="text/javascript">

（ function （）{

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