why base.onload(e) needed for custom page base class

Question

I have a page base class (.NET4):

public class SitePageBase : System.Web.UI.Page
{
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
    }
}

And derived class

public partial class WebsitePage : SitePageBase
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // some processing
    }
}

I checked the "Page_Load" in derived class only works if the "base.OnLoad(e)" is there on the base class's OnLoad event handler. Otherwise the "Page_Load" in derived class not get fired at all.

Can any one tell me, why this is happening?

P.S. The AutoEventWireup is set to true.

score 1 · Accepted Answer · edited May 23 '17 at 12:04

1

Because you are overriding the behaviour of the base class, and if you don't call base.OnLoad(e) then the base class will not continue it's implementation (in this case to raise the Load event)

In your case, if your not doing anything in OnLoad you can remove the method all together, or as i do remove Page_Load and do your load login in the overridden OnLoad

These are worth a read

edited May 23 '17 at 12:04

Community

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answered Mar 28 '11 at 15:54

Richard Friend

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Thank you for the explanation. I am not really doing anything there. so just removed it from the base class. Thanks again – user680505 Mar 29 '11 at 17:40

score 0 · Answer 2 · answered Sep 28 '17 at 18:12

0

set the AutoEventWireup to false, that solved the problem for me :)

answered Sep 28 '17 at 18:12

Raul

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score 0 · Answer 3 · answered Mar 28 '11 at 15:54

0

Clearly it's the base's OnLoad function that raises the Load event. If you don't call the base's OnLoad function, the Load event doesn't get raised, and your Page_Load event handler never gets invoked.

answered Mar 28 '11 at 15:54

Gabe

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score 0 · Answer 4 · answered Mar 28 '11 at 15:54

0

Because the base implementation of the OnLoad method fires the event that is handled by Page_Load

answered Mar 28 '11 at 15:54

Joe

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score 0 · Answer 5 · answered Mar 28 '11 at 15:54

0

Typically the base version of an On<Event> looks a little bit like this:

protected virtual void OnLoad(EventArgs e)
{
   if(Loaded != null)
      Loaded(this, e);
}

So in other words, the base member is the one that actually fires the event.

answered Mar 28 '11 at 15:54

CodingGorilla

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why base.onload(e) needed for custom page base class

5 Answers5