QueryableCollectionView FilterDescriptors CollectionChanged event not firing

[Chris]

We have a standard WPF MVVM project.  In one view model we have a QueryableCollectionView to which a radgridview is bound.  When the user filters the grid we had expected the QueryableCollectionView.FilterDescriptors.CollectionChanged to be fired but nothing is happening.  When we inspect the FilterDescriptors through visual studio we can see the collection is present.  Is this binding incorrect or am I missing something else?

Any help appreciated:

 

DisplayTrades = new QueryableCollectionView(displayTradeSource, typeof(TradeViewModel));
DisplayTrades.FilterDescriptors.CollectionChanged += CollectionChanged_Event;

private void CollectionChanged_Event(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
           throw Exception("test");
}

 

 

[Stefan]

Hello Chris,

I tried to reproduce such issue on my end, but to no avail. Can you please check the attached project?
You should notice, that when the user performs a filtering operation, the FilterDescriptors collection of the QCV raises the CollectionChanged event as expected. Am I missing something?

Can you please also shed more light on the need to use the QueryableCollectionView in such manner? Basically, RadGridView exposes Filtering/Filtered events from which you can benefit instead of using the FilterDescriptors.CollectionChanged event.

Best Regards,
Stefan X1
Telerik