wpf - Can't find or load merged resources dictionary

I have a WPF custom control library project structured as shown below, and I want reference the resource dictionary from this WPF ccl in another WPF app.

CustomUI/
├── CustomStyle/
│ ├── BasicComponents/
│ ├── Buttons/
│ │ ├── SmallButton.xaml
│ │ └── StandardButton.xaml
│ ├── ComboBox/
│ │ └── StandardComboBox.xaml
│ ├── PasswordBox/
│ └── StandardPasswordBox.xaml
├── MergedResourceDictionary.xaml

In the MergedResourceDictionary.xaml at the bottom, I’ve already included the other 4 resource dictionaries.
Like this:

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="CustomStyle/BasicComponents/Buttons/SmallButton.xaml"/>
    <ResourceDictionary Source="CustomStyle/BasicComponents/Buttons/StandardButton.xaml"/>
    <ResourceDictionary Source="CustomStyle/BasicComponents/ComboBox/StandardComboBox.xaml"/>
    <ResourceDictionary Source="CustomStyle/BasicComponents/PasswordBox/StandardPasswordBox.xaml"/>
</ResourceDictionary.MergedDictionaries>

When I try reference this MergedResourceDictionary.xaml in the App.xaml of another WPF app, I get an error saying the resource MergedResourceDictionary.xaml could not be found.

The path is:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/CustomUI;component/MergedResourceDictionary.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

However, if I use the path:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/CustomUI;component/CustomStyle/BasicComponents/Buttons/SmallButton.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

it works perfectly.

I want to know if I did something wrong. For example, is it not allowed to use merged dictionaries this way?

--- SOLVED ---------------------------

I recreated the both projects and fixing a namespace issue, it worked.

Although I’m not sure the namespace issue is related to the problem I mentioned above, I’d like to share my perspective in case it helps others:

I have a habit of anizing C# classes into folders, such as "Scripts", which causes all the class use the namespace CustomUI.Scripts, instead of CustomUI (root namespace).This actually create a problem, clr-namespace not declared in xaml.

I tried creating a C# class directly in the root directory and using CustomUI, and the XAML system immediately worked again...

I think that in

"pack://application:,,,/xxxx;component/yyyy.xaml"

xxxx is root namespace of the application rather than its project name I’m not sure. Just for reference.

I have a WPF custom control library project structured as shown below, and I want reference the resource dictionary from this WPF ccl in another WPF app.

In the MergedResourceDictionary.xaml at the bottom, I’ve already included the other 4 resource dictionaries.
Like this:

<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="CustomStyle/BasicComponents/Buttons/SmallButton.xaml"/>
    <ResourceDictionary Source="CustomStyle/BasicComponents/Buttons/StandardButton.xaml"/>
    <ResourceDictionary Source="CustomStyle/BasicComponents/ComboBox/StandardComboBox.xaml"/>
    <ResourceDictionary Source="CustomStyle/BasicComponents/PasswordBox/StandardPasswordBox.xaml"/>
</ResourceDictionary.MergedDictionaries>

When I try reference this MergedResourceDictionary.xaml in the App.xaml of another WPF app, I get an error saying the resource MergedResourceDictionary.xaml could not be found.

The path is:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/CustomUI;component/MergedResourceDictionary.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

However, if I use the path:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/CustomUI;component/CustomStyle/BasicComponents/Buttons/SmallButton.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

it works perfectly.

I want to know if I did something wrong. For example, is it not allowed to use merged dictionaries this way?

--- SOLVED ---------------------------

I recreated the both projects and fixing a namespace issue, it worked.

Although I’m not sure the namespace issue is related to the problem I mentioned above, I’d like to share my perspective in case it helps others:

I tried creating a C# class directly in the root directory and using CustomUI, and the XAML system immediately worked again...

I think that in

"pack://application:,,,/xxxx;component/yyyy.xaml"

xxxx is root namespace of the application rather than its project name I’m not sure. Just for reference.

Share Improve this question edited Jan 20 at 18:36 asked Jan 18 at 12:15 Adriano0113 34 bronze badges

It's great that you solved your issue, but please don't put the Answer in the Question. Kindly remove that block and post a Self-Answer instead. – IV. Commented Jan 20 at 19:20
...but now I seem to recall that requires >15 reputation... – IV. Commented Jan 20 at 19:25
I was also confused, and I tried to click "Answer" and he warned me that if I needed to add more information I could use the "Edit" function, so I put it in the question. I will fix it though, and I appreciate your help. – Adriano0113 Commented Jan 21 at 20:49
Thx for accepting my answer in the meantime! You're always free to change that designation in the future. – IV. Commented Jan 21 at 21:20

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1 Answer 1

Sorted by: Reset to default 0

I don't think you're doing anything conceptually wrong, and I suspect some kind of path typo perhaps. One strategy for debugging is to enumerate the binary markup resource names to see what's "actually there", using a snippet similar to this:

namespace Wpf.ClientApp
{
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            if (AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault(_ => _?.GetName()?.Name == "Wpf.CustomUI") is { } asm)
            {
                var debug = asm.GetManifestResourceNames().First();
                if (asm.GetManifestResourceNames().FirstOrDefault(_ => _.EndsWith("resources")) is { } resource)
                {
                    var resourceRoot = resource.Replace(".resources", string.Empty);
                    var resourceManager = new ResourceManager(resourceRoot, asm);

                    using (var resourceSet = resourceManager.GetResourceSet(System.Globalization.CultureInfo.CurrentCulture, true, true))
                    {
                        if (resourceSet != null)
                        {
                            foreach (DictionaryEntry entry in resourceSet)
                            {
                                Debug.WriteLine($"Key: {entry.Key}, Value Type: {entry.Value?.GetType()}");
                            }
                        }
                    }
                }
            }
        }
    }
}

When I use your text diagram to try and repro your hierarchy, I get this:

It enumerates as this:

Key: customstyle/basiccomponents/buttons/smallbutton.baml, Value Type: System.IO.UnmanagedMemoryStream
Key: mergedresourcedictionary.baml, Value Type: System.IO.UnmanagedMemoryStream
Key: customstyle/basiccomponents/buttons/standardbutton.baml, Value Type: System.IO.UnmanagedMemoryStream
Key: customstyle/basiccomponents/combobox/standardcombobox.baml, Value Type: System.IO.UnmanagedMemoryStream
Key: customstyle/basiccomponents/passwordbox/standardpasswordbox.baml, Value Type: System.IO.UnmanagedMemoryStream

And it works if I do this:

<Application x:Class="Wpf.ClientApp.App"
             xmlns="http://schemas.microsoft/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft/winfx/2006/xaml"
             xmlns:local="clr-namespace:Wpf.ClientApp"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/Wpf.CustomUI;component/MergedResourceDictionary.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

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