0

I have ActiveX ( COM ) control implented in C# that used in Internet Explorer. My control uses unmanaged resourses and I need know when tab(window) with control will be closed to release resources.
How my control can know that IE tab (window) with ActiveX( COM ) control was closed (without javascript call control methods when window closed)?

Alex Sebastiano
  • 67
  • 6
  • possible duplicate What is the proper way for an activeX (COM) control to clean up when closed by its parent? http://stackoverflow.com/questions/3390571/what-is-the-proper-way-for-an-activex-com-control-to-clean-up-when-closed-by-it – Sheng Jiang 蒋晟 Jun 26 '11 at 18:36

2 Answers2

0

An ActiveX control is based on COM, which uses refcounting. Your control should dispose its resources when it's refcount goes to zero. This is not trivial to detect from a C# activex control, but according to this question's answer, it is doable.

Community
  • 1
  • 1
0

If you are writing a UserControl override OnHandleDestroyed and place your resource releasing code there. Don't forget to call base.OnHandleDestroyed after your code in that method.

alisabzevari
  • 8,008
  • 6
  • 43
  • 67