Use Resource Dictionary Styles in my class library project without merging dictionaries - wpf

Question

I am creating a class library project that will contain WPF user controls. My Requirement is that all controls have the same style. My project looks like:
Things I have done in order to solve this problem:
Added all references needed by a WPF application System.Xaml, WindowsBase, etc.. so that I can have wpf controls in my class library project.
In AssemblyInfo.cs I have added:
[assembly: ThemeInfo(ResourceDictionaryLocation.None, ResourceDictionaryLocation.SourceAssembly)]
Added ResourceDictionary1.xaml To the project adding the style.
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<SolidColorBrush x:Key="Brush1" Color="#FF19199E"/>
</ResourceDictionary>
Now if I want to use a style on my UserControl1.xaml I do:
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="ResourceDictionary1.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<Grid >
<Rectangle Fill="{StaticResource Brush1}" />
</Grid>
I know it works great but here is the catch. Every time I create a new userControl I will have to merge the dictionary. On a regular WPF application I could just merge the dictionary once on App.xaml and I will be able to use that dictionary on my entire application. How can I avoid having to merge the dictionary every time I create a new userControl? If I plan on addying a new resource dictionary I will have to go to all userControls and merge another dictionary. Perhaps I wrote the question title incorrectly and my question should have been how can I add a App.xaml file to a class library project

Answer 1

You should replace the source value ResourceDictionary1.xaml like the follow:
Source="pack://application:,,,/ControlsDLL;component/ResourceDictionary1.xaml">
or just simple as following:
<UserControl.Resources>
<ResourceDictionary Source="pack://application:,,,/ControlsDLL;component/ResourceDictionary1.xaml"></ResourceDictionary>
</UserControl.Resources>