Retrieving contained Controls during postback using LoadPostData

[Nathan Sokalski]

I am writing a Control that inherits from
System.Web.UI.WebControls.CompositeControl. Like many Controls, my Control
renders more than just one inner Control. When a postback occurs, I need to
get the data posted by these inner Controls (by using the postCollection
argument). However, the postDataKey argument gives the key for the id of the
outer Control. When I need to access the value posted by one of the inner
Controls, I have found that I need to enter the id as a literal String for
the key, but this seems a little too simple for me, with all the Controls
that could get created. Is there some property or method that I should be
using to determine the key? Thanks.

 

[Teemu Keiski]

Hi,

Control's UniqueID property is usually used as key in form post collection.

 

[Nathan Sokalski]

That's what I thought, and what I have used in a previous Control of mine,
but when I try to do that here I am recieving an error that the Control does
not exist. When I did a debug session I found that the value of the Control
was Nothing. Therefore, I cannot get to the UniqueID. Any idea what could be
causing this? Thanks.

 

[Teemu Keiski]

Does your control create child controls in CreateChildControls?. That way
you ensure controls are there when you access the Controls collection.

 

[Teemu Keiski]

Note: if you access Control instance directly, call EnsureChildControls
before that

 

[Nathan Sokalski]

Thank you for your help, I should probably be slapping myself in the head
for my mistake: I created the Controls in CreateChildControls, but forgot
the Me.Controls.Add() method! Thanks again for your help.