CollectionViewSource as Class Property Type

Question

I have a Class in my main WPF application which has a Property defined in the class as follows:

Public Class AppExample
    Public PropertyName As CollectionViewSource

The project solution also inherits a Class Library (separate project but included in the solution and using the Inherits statement) - in the Class Library I want to do the same thing but I get an error.

Public Class ClassLibraryExample
    Public PropertyName as CollectionViewSource

this results in:

Type 'CollectionViewSource' is not defined

How do I fix this?

Answer 1

Add the refernce of PresentationFramework.dll to your class library. It has namespace System.Windows.Data which contains CollectionViewSource

Answer 2

When you are using CollectionViewSource you have to use Data namespace(System.Windows.Data).