I derived my own Control from HandleExternalEvent, using wca.exe. I want this control to behave the following:

- The Event args (derived from ExternalDataEventArgs ) of the event which is to be handled include a Property A, which can be either 1, 2 or 3
- My derived Control has a user-settable "Filter" property which can be set to 1, 2 or 3
- Only if Property A of the received Event is set to the Filter value, the event is "handled".

To my surprise I discovered that the "Execute" method of HandleExternalEvent is sealed, so I cannot implement my filter in an override of this method.

Does anyone have a solution to this (other than write my own HandleExternalEvent control from ground up)?

Thanks for any help,

Urs

One solution is to create a queue in the Excecute Method of a Custom activity (derived from Activity, not HandleExternalEvent, because this method is sealed), to have a service posting an event in the queue, to dequeue the info in the queueItemAvailable event on the activity side and to check if your event property A matches your filter value. It's quite simple, robust and that works.

You can download the following sample from Paul Andrew blog.

Hope this helps

Serge