在表单上处理ActiveX控件

Question

I have a third party ActiveX control that I am embedding in a form. The control's class implements IDisposable. My question is should I manually call the control's dispose method either in the form closing event or go into the designer and edit the form dispose method to call the control's dispose.

I understand that a form calls the dispose methods of all the controls it owns, however are there any exceptions since this is a COM control. Thanks.

PS: I am using Visual Studio 2008, .Net 3.5, Project Type: Windows Forms Application

Answer 1

MSDN Marshal.ReleaseComObject In order to Release or Free a COM Object you need to use this code

System.Runtime.InteropServices.Marshal.ReleaseComObject( someComObject); 

//this is your COM Object Dispose will not work on a COM Object for example Debug and try to Dispose your object using code like this if you have an object named fs

((IDisposable)fs).Dispose();

Answer 2

No, there is nothing special you have to do.

Because the Control class (from which other container controls such as Form inherit from) implements the IDisposable interface , it should (if it follows the standard IDisposable implementation guidelines ) dispose of any references that it holds that implement the IDisposable interface.

That said, your control, assuming that it is in the controls collection exposed by the Controls property , will have it's IDisposable.Dispose method called when the window containing it is closed (as closing the window causes the window's Dispose method to be called).