what does RegisterRequire sPostBack REALLY do??

[Sam]

According to "Developing Microsoft ASP.NET Server Controls and
Components", a control can get the LoadPostData event by using
RegisterRequire sPostBack, even if its UniqueID does not match that of
the Forms collection.

In the code below, I've tried doing this on a Page instead of a
regular control. However, it doesn't work. The LoadPostData is never
fired, even on postback. Does anyone have any idea why? How could I
make it work for a Page without having to put its UniqueID in the
Forms collection?

As an aside, the Page.ID remained null, even as late as OnPreRender
(that's why I assigned it in OnInit). Does anyone have any ideas
about this as well?

Thanks!!!

-Sam

public class Test : System.Web.UI.P age, IPostBackDataHa ndler
{
protected Button test;

override protected void OnInit(EventArg s e)
{
this.ID = "page";
test.Text = "Click Me!";
test.Click += new EventHandler(Te st_Click);
base.OnInit(e);
}

protected override void OnPreRender(Eve ntArgs e)
{
Page.RegisterRe quiresPostBack( this);
base.OnPreRende r (e);
}

public void RaisePostDataCh angedEvent()
{
}

public bool LoadPostData(st ring postDataKey,
System.Collecti ons.Specialized .NameValueColle ction postCollection)
{
return false;
}

private void Test_Click(obje ct sender, EventArgs e)
{
test.Text = "Clicked!";
}
}

[Teemu Keiski]

It doesn't work for Page, because it is Page itself controlling the postback
data loading for controls. It never tries to to call
IPostBackDataHa ndler.LoadPostD ata for itself.

RegisterRequire sPostBack adds the UniqueId of the control to the list of
controls that require postback data handling. At postback it tries to locate
the controls matching this list and call their IPostBackDataHa ndler
implementation (however, it searches from Page's child controls, therefore
Page itself cannot be found).

--
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist
http://blogs.aspadvice.com/joteke

"Sam" <sa*******@yaho o.com> wrote in message
news:1a******** *************** ***@posting.goo gle.com...

According to "Developing Microsoft ASP.NET Server Controls and
Components", a control can get the LoadPostData event by using
RegisterRequire sPostBack, even if its UniqueID does not match that of
the Forms collection.

In the code below, I've tried doing this on a Page instead of a
regular control. However, it doesn't work. The LoadPostData is never
fired, even on postback. Does anyone have any idea why? How could I
make it work for a Page without having to put its UniqueID in the
Forms collection?

As an aside, the Page.ID remained null, even as late as OnPreRender
(that's why I assigned it in OnInit). Does anyone have any ideas
about this as well?

Thanks!!!

-Sam

public class Test : System.Web.UI.P age, IPostBackDataHa ndler
{
protected Button test;

override protected void OnInit(EventArg s e)
{
this.ID = "page";
test.Text = "Click Me!";
test.Click += new EventHandler(Te st_Click);
base.OnInit(e);
}

protected override void OnPreRender(Eve ntArgs e)
{
Page.RegisterRe quiresPostBack( this);
base.OnPreRende r (e);
}

public void RaisePostDataCh angedEvent()
{
}

public bool LoadPostData(st ring postDataKey,
System.Collecti ons.Specialized .NameValueColle ction postCollection)
{
return false;
}

private void Test_Click(obje ct sender, EventArgs e)
{
test.Text = "Clicked!";
}
}