Comparing fields of a Work Item when filtering event notification
Hi,
I'm having some troubles setting the Event Filter when subscribing to the WorkItemChangedEvent.
I need to compare two values of the work item. For example, I want to know if the Assigned To field was changed. I tried the following:
"CoreFields/StringFields/Field[ReferenceName='System.AssignedTo']/OldValue" <> "CoreFields/StringFields/Field[ReferenceName='System.AssignedTo']/NewValue"but notifications always are sent even if the Assigned To field didn't change.
Am I doing something wrong?
Thanks a lot!
I'm afraid the filtering only does comparisions with constants on the right side of the operator, so this doesn't work. It is treating the expression on the right as a constant, and always evaluating to true. Since "Assigned To" is a core field, it is always present in each work item change event, so you cannot use its presence as an indicator. If notification is arriving in the form of a webmethod, you can receive all notifications and then check the values programmatically. If it is arriving as an email, however, you can't.
Thanks Pete for the answer!
I'm using SOAP notification and I was doing what you suggested, to check the values programatically in the web service. But I wanted to avoid unnecessary notifications...
I hope future versions will support making this kind of comparisons to avoid using more bandwidth than needed.
Cheers,
