Figuring this out took me nearly an hour today, so I considered it worth blogging about it.

If you have an assembly which contains a ResourceDictionary that you want to use in another assembly: here’s what you do.

<Application.Resources>
  <ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
      <ResourceDictionary Source="ms-appx:///AssemblyName/FolderName/DictionaryName.xaml"/>
    </ResourceDictionary.MergedDictionaries>
  </ResourceDictionary>
</Application.Resources>

Actually it’s the same pattern (ms-appx:///) which is used for referencing images and other content in Universal Apps.

Here’s an example, how the resources exported by my development framework Newport can be used.

<ResourceDictionary Source="ms-appx:///Newport.Universal/Controls/ResourceDictionary.xaml"/>