Like sorting, filtering in a CollectionViewSource is not automatically done when you change the contents of one of the data bound items.  By default, you need to call the Refresh method of the CollectionViewSource .

In the example below, we filter on first name “Joan” and then change Joan Fontaine’s first name to “Bob”.  Notice that the list is not re-filtered–Bob remains in the list.

You can fix this by adding the FirstName property to the LiveFilteringProperties collection of the CollectionViewSource and setting IsLiveFilteringRequested to true .

<CollectionViewSource x:Key="cvsActors" Source="{Binding ActorList}" IsLiveFilteringRequested="True"> <CollectionViewSource.LiveFilteringProperties> <clr:String>FirstName</clr:String> </CollectionViewSource.LiveFilteringProperties> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="LastName" /> </CollectionViewSource.SortDescriptions> </CollectionViewSource>

Now, when we change Joan to Bob and we’re filtering on “Joan”, Bob automatically disappears from the list.

Feb »