Control.FindForm 和 ContainerControl.ParentForm 有什么区别

Question

I'm wondering if there is any functional (or otherwise) difference between Control.FindForm and ContainerControl.ParentForm ? I've been using .ParentForm when creating my own user controls but would there be any reason .FindForm would be a better choice? From what I can tell, they would always return the same form (ie. the form the user control is on, or null). Is .ParentForm just calling .FindForm or is there a time where the two could be different (maybe with mdi windows)?

Answer 1

They are subtly different. ParentForm will return null when you call it on a toplevel Form since it has no parent. FindForm() will not, it returns itself. And ParentForm makes a security demand, FindForm() does not. They otherwise use the same internal implementation. Winforms itself doesn't use ParentForm at all, I would ignore it.