winform designer auto-generate has execute control method?

Question

I have create a class inherited from TreeView , and I wanna create some nodes when tree created. So I override the OnCreateControl method and write init code into this method.

When I drag this control to Form Designer, the auto-generate code has contained nodes.

Why OnCreateControl method has been executed when I drag the control to Form Designer?

How can I stop this behavior?

Answer 1

Use DesignMode property to determine if your control created at runtime or in VS designer:

protected override OnCreateControl()
{
    base.OnCreateControl();

    if (!this.DesignMode)
    {
       // your code here
    }
}