User control memory leak - FYI

I've reported an issue to support (bug# OE00180507) regarding user controls not being cleared from memory when the containing form is deleted.

If a user control is created and subsequently added to a form at design time, it would be assumed the user control would be deleted when the form is. I've found, by running through SESSION:FIRST-OBJECT / SessionObject:NEXT-SIBLING that after the form is deleted, the user controls stays in the list and is not delete from memory.

As a workaround, I've created a User Control base class that I now inherit for any User Control I create. In the base class, I subscribe to its Load event. I use the Load event method and a manually added FormClosing event (both shown below) to delete the User Control when the containing form is deleted.

So far this has worked well.

JL

METHOD PRIVATE VOID BaseUserControl_Load

( INPUT sender AS System.Object,

INPUT e AS System.EventArgs ):

DEFINE VARIABLE ControlParent AS Progress.Windows.Form NO-UNDO.

ControlParent = CAST(THIS-OBJECT:FindForm(),Progress.Windows.Form).

IF VALID-OBJECT(ControlParent) THEN

ControlParent:FormClosing:SUBSCRIBE(BaseParentFormClosing) NO-ERROR.

RETURN.

END METHOD. /* BaseUserControl_Load */

METHOD PRIVATE VOID BaseParentFormClosing

( INPUT sender AS System.Object,

INPUT e AS System.Windows.Forms.FormClosingEventArgs ):

DELETE OBJECT THIS-OBJECT NO-ERROR.

RETURN.

END METHOD. /* BaseParentFormClosing */