How to build library with WPF forms

Question

Is it possible to build a Class Library dll which also includes WPF forms? When I try to build one I get following errors:

Error 1 Librar

Answer 1

Extending @2493490 answer.

Right click on the app.xaml file and exclude it from the project. Change the project output type to in project properties to Class Library. Click on the run icon, the solution will successfully build but will not run/execute any code. A error message will be displayed explaining as such.