Control Addition safety handling

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joeycalisay - 03 Jan 2005 05:49 GMT

I was curious about the following scenario but couldn't find the exact
handling using disassembler:

What happens if an instance of a control already added in the Controls
collection of a form is added again? Is there a reference check on each
control addition to handle the said scenario?

It is possible that there is a reference checking since the OnControlAdded
event is not raised for the second time. Anyone who can shed some light on
the said handling? Thanks a lot!

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Herfried K. Wagner [MVP] - 03 Jan 2005 11:30 GMT

"joeycalisay" <hcalisay@_spamkiller_codex-systems.com> schrieb:

> What happens if an instance of a control already added in the Controls
> collection of a form is added again? Is there a reference check on each
[quoted text clipped - 4 lines]
> on
> the said handling? Thanks a lot!

Yes, the 'Controls' collection checks if the control has already been added
and then adds the control only if it's not already in the collection.

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M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/

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