I'll describe the simplest situation of the problem.
I have a simple Web User Control which only contains a: <div id="bla"
runat="server" /.
I dynamically add it to a page, by performing:
SomeCtl ctl = new SomeCtl();
this.Controls.A dd(ctl);
and of course apply a <% @ Register %tag in order to make SomeCtl known to
the page (is there some more elegant way?).
I override OnPreRender of the control, in order to write some stuff to the
DIV according to some property of the control, but I can't (within the
event code) access the DIV. It is equal to null.
The issue happens of course only when my user control (SomeCtl) is added
dynamically to the page, and not when I place the user control directly
within the page at design time.
Thanks in advance for your help,
Ofer 15  1890 
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:eD******** ******@TK2MSFTN GP04.phx.gbl...
The issue happens of course only when my user control (SomeCtl) is added
dynamically to the page, and not when I place the user control directly
within the page at design time.
In which method are you adding the control...?
If you're doing it in Page_Load, try doing it in Page_Init instead...
The host of that user control is a control itself (in this case, a
"regular", design-mode placed one).
I can't put it in Page_Init of the host control, because the code must
access properties of the control which are not available in its Page_Load
event yet...
"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:ek******** ******@TK2MSFTN GP04.phx.gbl...
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:eD******** ******@TK2MSFTN GP04.phx.gbl...
The issue happens of course only when my user control (SomeCtl) is added
dynamically to the page, and not when I place the user control directly
within the page at design time.
In which method are you adding the control...?
If you're doing it in Page_Load, try doing it in Page_Init instead...
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:ek******** ******@TK2MSFTN GP04.phx.gbl...
The host of that user control is a control itself (in this case, a
"regular", design-mode placed one).
OK.
I can't put it in Page_Init of the host control, because the code must
access properties of the control which are not available in its Page_Load
event yet...
In which case, you might find that you need to rethink your logic here a
bit, as I'm pretty sure the problem is that the dynamic creation of the
control is occurring too late in the overall page cycle...
I've seen this many times with dynamically created controls... Create them
in Page_Load, they sometimes work... Create them in Page_Init or
Page_PreInit, they always work...
I can't see a way to change it...
As for the host control (design-time) - as I said, I can't run the
Controls.Add() at its Page_Init event (or any sooner event of course)
because the host control won't be able to access its properties. So it must
run at Page_Load, and in that case - runtime created control's child
controls are always null.
"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:ek******** ******@TK2MSFTN GP04.phx.gbl...
The host of that user control is a control itself (in this case, a
"regular", design-mode placed one).
OK.
I can't put it in Page_Init of the host control, because the code must
access properties of the control which are not available in its
Page_Load
event yet...
In which case, you might find that you need to rethink your logic here a
bit, as I'm pretty sure the problem is that the dynamic creation of the
control is occurring too late in the overall page cycle...
I've seen this many times with dynamically created controls... Create them
in Page_Load, they sometimes work... Create them in Page_Init or
Page_PreInit, they always work...
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:e5******** ******@TK2MSFTN GP04.phx.gbl...
I can't see a way to change it...
As for the host control (design-time) - as I said, I can't run the
Controls.Add() at its Page_Init event (or any sooner event of course)
because the host control won't be able to access its properties. So it
must
run at Page_Load, and in that case - runtime created control's child
controls are always null.
As I said, I think you'll have to redesign this piece of functionality
because I don't believe what you're trying to do is possible the way you
have architected it...
I need some more technical answer, specifically why child controls are not
available when the parent is created at run-time.
I'll resubmit the question in a new thread, maybe someone can pinpoint the
issue exactly...
Thanks!
"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:e5******** ******@TK2MSFTN GP04.phx.gbl...
I can't see a way to change it...
As for the host control (design-time) - as I said, I can't run the
Controls.Add() at its Page_Init event (or any sooner event of course)
because the host control won't be able to access its properties. So it
must
run at Page_Load, and in that case - runtime created control's child
controls are always null.
As I said, I think you'll have to redesign this piece of functionality
because I don't believe what you're trying to do is possible the way you
have architected it...
Hi Ofer,
I'm not sure if I've fully understood your question, so please feel free to
correct me:
1) You have a web user control which need to load another copy of itself
into its control hierarchy. I think you must have some logic to prevent the
control from recursively loading infinitely, would you please show the
logic here?
2) Normally we use LoadControl to dynamically load a web user control
instead of using "new":
#Overview of user controls vs. custom controls http://support.microsoft.com/kb/893667
Sincerely,
Walter Wang (wa****@online. microsoft.com, remove 'online.')
Microsoft Online Community Support
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"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
>I need some more technical answer, specifically why child controls are not
available when the parent is created at run-time.
It's to do with the page creation process...
As I've mentioned (a couple of times now), if dynamic controls are created
in Page_Load they mostly don't work properly because they are created too
late to be wired up correctly etc.
However, if they are created in Page_Init or Page_PreInit, then they pretty
much always work...
I appreciate that you find this annoying because of the way you've designed
things, but there's not much I can do about that...
Posting the same question again won't get you a different answer...
Page_Init or anything similar doens't do the work - I checked.
About redesign, I can't think of a simpler model, so it would be a problem.
All that I have, and need, is a regular user control created at design time,
which in turn creates other user controls at runtime. In that case, as I
said, the runtime-generated control doesn't have children (simple HTML
elements), and it seems to me like a bug in the product itself...
"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:Oc******** ******@TK2MSFTN GP05.phx.gbl...
"Ofer Zelig" <of**@newsgroup s.nospamwrote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
I need some more technical answer, specifically why child controls are
not
available when the parent is created at run-time.
It's to do with the page creation process...
As I've mentioned (a couple of times now), if dynamic controls are created
in Page_Load they mostly don't work properly because they are created too
late to be wired up correctly etc.
However, if they are created in Page_Init or Page_PreInit, then they
pretty
much always work...
I appreciate that you find this annoying because of the way you've
designed
things, but there's not much I can do about that...
Posting the same question again won't get you a different answer...
This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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I'll describe the simplest situation of the problem.
I have a simple Web User Control which only contains a: <div id="bla"
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I dynamically add it to a page, by performing:
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and of course apply a <% @ Register %tag in order to make SomeCtl known to
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