CODEWITHSUNDEEP
.netwinformscustom-controls
abenci
abenci

Reputation: 8651

Control.Parent = null

I have my own control derived from Windows.Forms.Control and I am checking the Parent.BackColor inside the overrided of OnHandleCreated() method. At desing-time the Parent property first returns null, then - after form is completely loaded - returns the real parent window: the form itself.

We need to draw part of the custom control with the same color of the parent form background: when can we rely on the Control.Parent value?

Thanks.

Upvotes: 2

Views: 1560

Answers (3)

arbiter
arbiter

Reputation: 9575

Actually I do not see problem here. Because as I understand you need parent for drawing something with parent back color, and when you receive your control's Paint event (OnPaint, WM_PAINT) parent already initialized.

Upvotes: 0

Adam Robinson
Adam Robinson

Reputation: 185643

You can use the ParentChanged event to detect when that property changes and trigger a redraw (though one should occur automatically). There are some properties, however (BackColor and ForeColor being two of them, I believe) that are "inherited" from the parent if not set explicitly, so you should be able to use those as well.

Upvotes: 2

Andrija
Andrija

Reputation: 14483

you can use if( this.DesignMode ) return; to determine if your control is in design and not get exception or to do additional checking. In Windows Forms, after InitilizeComponents, afaik Control always have parent.

Upvotes: 0

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