Is this hWnd a child of mine?

Question

How can I tell if an hWnd belongs to one of my child controls?

I want to do something like:

if(this.Controls.Find(hWnd) != null) return false;

Answer 1

There's a Win32 function for this: IsChild

Answer 2

Sounds like a great chance to use recursion. Add this function to your parent class:

  private bool IsChild(System.Windows.Forms.Control control, System.IntPtr hWnd)
  {
     if(control.Handle == hWnd)
        return(true);

     foreach (System.Windows.Forms.Control child in control.Controls)
     {
        if (IsChild(child, hWnd))
           return (true);
     }
     return (false);
  }

You can then use this function to search this parent class for any child controls with the specified hWnd:

this.IsChild(this, hWnd);