Question

I’m trying to get my application (WPF) use a referenced assembly in my App.xaml using Pack URIs. In my solution I have several projects. In the base application, I just have my App.xaml. I would like this to use a referenced assembly.

Call my base project with App.xaml Project 1 (in the solution). This is the relevant part of App.xaml:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/MyProject.Project2;component/Themes/Generic.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

Project 2 has a folder “Themes” with Generic.xaml. I’m fairly sure that I’m doing the Pack URI incorrectly because none of the styling in Generic.xaml is being used (I’m overriding the default window with a custom window, but it does not currently work. Application shows up with default window styling, everything inside the window is black).

Folder hierarchy:

MainFolder
    Project 1
        App.xaml
        bin
            Debug
                Application.exe
    Project 2
        Themes
            Generic.xaml

Questions:

1. Can someone explain the pack://application:,,, syntax? What does all of this mean?
2. What am I doing wrong with the Pack URI?

Thanks in advance.

Answer 1

Figured it out. Turns out in MyProject.Project2 I needed the following code in AssemblyInfo.cs:

[assembly: ThemeInfo(
ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
//(used if a resource is not found in the page, 
// or application resource dictionaries)
ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
//(used if a resource is not found in the page, 
// app, or any theme specific resource dictionaries)
)]