Cannot find resource dictionary in WPF application

Question

I\'m in the process of building a WPF application and ran into an error when trying to reference a resource dictionary. Inside my WPF application project I have a folder cal

Answer 1

Sometimes closing Visual Studio and open it again solves this problem.

Answer 2

Change the target .net version to an older one in the project properties and then reset to the previous version.

Answer 3

Make sure that the build action for MetroTheme.xaml is set to Page.

Answer 4

I had the same issue, but setting Build Action = Page did not solve for me. Turned out I needed to use the Pack URI Format. So,

<ResourceDictionary Source="pack://application:,,,/Styles/MetroTheme.xaml"/>

EDIT

Turns out the above will eliminate build error but still results in runtime error. I needed to include full assembly specification for complete resolution (even though all files are in same assembly):

<ResourceDictionary Source="pack://application:,,,/WpfApplication10;component/Styles/MetroTheme.xaml"/>