I have a CompositeCollection that consists of ObservableCollections of two types: Companies and Contacts. Contact has a property FullName while Company has a property Name.
I want to apply sorting so the collections are mixed by their types but sorted by their name, example:
Itzhak Perlman
John Doe
Microsoft
Sarah Moore
StackOverflow
Walter Richardson
Note that I bound the ItemsControl to a CollectionViewSource that its Source is set the CompositeCollection, it's view becomes a CompositeCollectionView, it's an internal type, if I explicitly set its type to ListCollectionView, it only contains the CollectionContainers as its items.
Desired solution is a workaround to enable sorting, filtering and grouping on a CompositeCollections, I don't care to override and create my own CompositeCollection, I just don't know how I can override this and enable its functionality in xaml.
Who said I must get advantage of the thingy called 'CompositeCollection'?
I decided not to use a CompositeCollection.
I am just creating an ObservableCollection(of Object) mixed of the two types, and binding the CollectionViewSource to it.
By inheriting CompositeCollection and implenting IBindingList, sorting can be enabled.