SelectionChangeEventHandler randomly disappears in Outlook 2007

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I've created an Outlook 2007 add-in via VS2008.

In the ThisAddIn_Startup method I attach a SelectionChangeEventHandler to

the Active Explorer selection change event via the following:

this.Application.ActiveExplorer().SelectionChange += new

Microsoft.Office.Interop.

Outlook.ExplorerEvents_10_SelectionChangeEventHandler(HelpdeskAddIn_SelectionChange);

This is to get the currently selected item.

Problem is the listener seems to stop working after a varying amount of

clicks/keyboards moves within the current mailbox window.

This sometimes happens after the 'reminders' window pops up, after opening

an email in a new inspector window or clicking about and using the cursor

keys.

Its confusing me as it doesn't seem to happen at the same point

consistently but on average after 20 new selections it disappears

Any ideas?
 
The garbage collector is removing the event handler. It's non-deterministic

as to when that would happen.

Make sure to declare at class level an Explorer object and instantiate that

and assign your event handler to that Explorer object. That way the garbage

collector won't remove the object or handler while the class that holds that

object is still in scope.

"logster" <logster> wrote in message

news:A2984D51-60D8-4271-B243-6B3C78DC6727@microsoft.com...
> I've created an Outlook 2007 add-in via VS2008.

> In the ThisAddIn_Startup method I attach a SelectionChangeEventHandler to
> the Active Explorer selection change event via the following:

> this.Application.ActiveExplorer().SelectionChange += new
> Microsoft.Office.Interop.

> Outlook.ExplorerEvents_10_SelectionChangeEventHandler(HelpdeskAddIn_SelectionChange);

> This is to get the currently selected item.

> Problem is the listener seems to stop working after a varying amount of
> clicks/keyboards moves within the current mailbox window.

> This sometimes happens after the 'reminders' window pops up, after opening
> an email in a new inspector window or clicking about and using the cursor
> keys.

> Its confusing me as it doesn't seem to happen at the same point
> consistently but on average after 20 new selections it disappears

> Any ideas?
 
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