If a filter is set, this property value only includes items that pass the filter. If the underlying collection is of type IEnumerable, this is an O(N) operation. This value is cached until the collection changes.
Notes to Inheritors
When deriving from CollectionView, override this property to provide a more efficient implementation.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)