when hwnd is created ?

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shark - 17 Dec 2007 11:13 GMT

Hi,

My question is, when exactly window is being created? Let's assume that we
have user control placed on any form. Form's contructor create user control
and adds it to its controls collection. But when exactly this window is
created? When form window is created ?
I thought that it's created when first windows property is get/set, but
initializecomponent do it several times.

Thanks

SS

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Peter Duniho - 17 Dec 2007 18:03 GMT

> My question is, when exactly window is being created? Let's assume that
> we have user control placed on any form. Form's contructor create user
> control and adds it to its controls collection. But when exactly this
> window is created? When form window is created ?

Generally, it would be when the control is shown. If you need for the
handle to exist prior to that (in the constructor, for example) you can
call Control.CreateControl(). As long as the Visible property is set,
that will initialize the control's handle as well as those of all the
children. If the Visible property is clear, you can call
Control.CreateHandle() instead. It won't initialize the children, but the
handle for the control itself will be created.

All that said, generally speaking the better solution is to put whatever
code relies on the control handle into the FormShown or Load event
handlers/overrides, by which time the control handle should be initialized.

Pete

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when hwnd is created ?

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