INamingContainer has change my controls event order.....

[Alex Stevens]

Hi All,

I have built a composite user web control and I've NOT implemented
INamingContainer.
It does implement IPostBackDataHandler to retrieve information entered into
the controls when the host page is submitted.

In the controls LoadPostData event, I retrieve the information entered and
act upon.
The information entered affects the way the control is rendered, so in the
controls CreateChildControls event, I build the objects as they should be
based, on the information the user entered and submitted.

Once I put the control onto a web form it worked fine in isolation, but once
I added other controls to the host page it fell over with the error:
"Multiple controls with the same ID '_ctl1' were found. FindControl requires
that controls have unique IDs."

Fair enough, so I go to my control and Implement INamingContainer so that it
prefixes all the controls within my user control with the main controls
name.
However, this effected another change. The LoadPostData event is now
executed after the CreateChildControls event. This means that I can't render
the control based on what was retrieved in the LoadPostData event????

This seems like a fairly sensible thing to do, so why when implementing
INamingContainer do the control base events change order???
How do I render the controls objects based on information retrieved in the
LoadPostData event????

Thanks

Alex

[Victor Garcia Aprea [MVP]]

Hi Alex,

When you need to re-create children controls because of the value of a
posted field, some event ocurrence, or anything else, then you can simply do
so by setting the ChildControlsCreate property to false. This will flags the
children as not created so next time ASP.NET needs to handle children
control will notice them and recreate them, and this recreation will happen
now with any updated value you would have set before.

--
Victor Garcia Aprea
Microsoft MVP | ASP.NET
Looking for insights on ASP.NET? Read my blog:
[url]http://clariusconsulting.net/vga[/url]
My profile: [url]http://aspnet2.com/mvp.ashx?vga[/url]


"Alex Stevens" <alexstevens_nospam_@blueyonder_nospam_.co.uk> wrote in
message news:dMbdd.84374$ay5.66108@fe1.news.blueyonder.co. uk...

> Hi All,
>
> I have built a composite user web control and I've NOT implemented
> INamingContainer.
> It does implement IPostBackDataHandler to retrieve information entered
> into
> the controls when the host page is submitted.
>
> In the controls LoadPostData event, I retrieve the information entered and
> act upon.
> The information entered affects the way the control is rendered, so in the
> controls CreateChildControls event, I build the objects as they should be
> based, on the information the user entered and submitted.
>
> Once I put the control onto a web form it worked fine in isolation, but
> once
> I added other controls to the host page it fell over with the error:
> "Multiple controls with the same ID '_ctl1' were found. FindControl
> requires
> that controls have unique IDs."
>
> Fair enough, so I go to my control and Implement INamingContainer so that
> it
> prefixes all the controls within my user control with the main controls
> name.
> However, this effected another change. The LoadPostData event is now
> executed after the CreateChildControls event. This means that I can't
> render
> the control based on what was retrieved in the LoadPostData event????
>
> This seems like a fairly sensible thing to do, so why when implementing
> INamingContainer do the control base events change order???
> How do I render the controls objects based on information retrieved in the
> LoadPostData event????
>
> Thanks
>
> Alex
>
>

[Kasabaarde Sumta]

I have a similar situation as Alex did, but when I tried setting
ChildControlsCreated=false, two instances of the object were rendered in the
browser. A before and an after. Where should this call be made?

"Victor Garcia Aprea [MVP]" wrote:

> Hi Alex,
>
> When you need to re-create children controls because of the value of a
> posted field, some event ocurrence, or anything else, then you can simply do
> so by setting the ChildControlsCreate property to false. This will flags the
> children as not created so next time ASP.NET needs to handle children
> control will notice them and recreate them, and this recreation will happen
> now with any updated value you would have set before.
>
> --
> Victor Garcia Aprea
> Microsoft MVP | ASP.NET
> Looking for insights on ASP.NET? Read my blog:
> [url]http://clariusconsulting.net/vga[/url]
> My profile: [url]http://aspnet2.com/mvp.ashx?vga[/url]
>
>
> "Alex Stevens" <alexstevens_nospam_@blueyonder_nospam_.co.uk> wrote in
> message news:dMbdd.84374$ay5.66108@fe1.news.blueyonder.co. uk...

> > Hi All,
> >
> > I have built a composite user web control and I've NOT implemented
> > INamingContainer.
> > It does implement IPostBackDataHandler to retrieve information entered
> > into
> > the controls when the host page is submitted.
> >
> > In the controls LoadPostData event, I retrieve the information entered and
> > act upon.
> > The information entered affects the way the control is rendered, so in the
> > controls CreateChildControls event, I build the objects as they should be
> > based, on the information the user entered and submitted.
> >
> > Once I put the control onto a web form it worked fine in isolation, but
> > once
> > I added other controls to the host page it fell over with the error:
> > "Multiple controls with the same ID '_ctl1' were found. FindControl
> > requires
> > that controls have unique IDs."
> >
> > Fair enough, so I go to my control and Implement INamingContainer so that
> > it
> > prefixes all the controls within my user control with the main controls
> > name.
> > However, this effected another change. The LoadPostData event is now
> > executed after the CreateChildControls event. This means that I can't
> > render
> > the control based on what was retrieved in the LoadPostData event????
> >
> > This seems like a fairly sensible thing to do, so why when implementing
> > INamingContainer do the control base events change order???
> > How do I render the controls objects based on information retrieved in the
> > LoadPostData event????
> >
> > Thanks
> >
> > Alex
> >
> >

>
>
>