Home/ Questions/Q 7664723
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-31T14:22:37+00:00

I have got a Class Library project where I keep some interfaces and classes

  • 0

I have got a Class Library project where I keep some interfaces and classes for my WPF Application and RIA Services.

Into the one of class I want to add a member 

Brush BackgroundColor { set; get; }

or

SolidColorBrush BackgroundColor { set; get; }

But I got this error.

Error 2 The type ‘System.Windows.Freezable’ is defined in an assembly
that is not referenced. You must add a reference to assembly
‘WindowsBase, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35’.

What’s up?

How to fix it if under Add Reference window I cannot see that assembly at all?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    The solution is simple. Just add references to the following three DLLs:

    WindowsBase.dll

    PresentationFramework.dll

    PresentationCore.dll

    In .Net 4.5, these DLL’s typically reside in a directory with a name similar to: C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5

    • 0