vb.net WPF窗口类需要导入吗？

Question

I have a class library with extension methods and I'm trying to write an extension method that works with a Window class, from a WPF app.

When I try writing the extension to accept a parameter of type Window, I get an error that this type can't be found;

I can't seem to find an assembly to import that will resolve this error, so I thought I'd post it here to see if I'm doing something wrong.

As an example, here's a simple extension I'd like to be able to use:

    <Extension>
    Public Sub helloworld(window As System.Windows.Window) 'Error- type system.windows.window is not defined

        ...

    End Sub

But I'm getting the error that the type system.windows.window is not defined.

I've even tried adding a reference to this class library to the System.Windows assembly, and adding an imports at the top of the screen, but it doesn't help.

Answer 1

I ended up taking a look at the references used on a normal WPF app project, and realized that there's a reference to PresentationFramework.... which is verbiage similar to...Windows Presentation Framework (WPF) ;)

I added this reference to my class library, and suddenly everything just worked.