The 'clr-namespace' URI refers to a namespace that is not included in the assembly

Question

I\'m trying to include in my XAML some classes which convert values. However, I\'m getting the following error when I compile:

Undefined CLR namespac

Answer 1

If you reference to an external project, you must specify the assembly as it appears in your project's references:

xmlns:mdls="clr-namespace:MyProject.Models;assembly=MyProject.Models"