MergedDictionaries nightmare - c#

I'm trying to use a WPF Template and I'm supposed to include this in my App.xaml, but I get "Nested properties are not supported: ResourceDictionaries.MergedDictionaries" error and "The attachable property "MergedDictionaries" was not found in type "ResourceDictionary".
<Application x:Class="Unico.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml">
<Application.Resources>
<ResourceDictionary.MergedDictionaries>
<!-- Set default skin -->
<ResourceDictionary Source="\ExpressionDark.xaml"/>
<ResourceDictionary Source="\WindowStyle.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type Rectangle}" />
</Application.Resources>
</Application>
I've tried everything but still can't fix this. Any idea? Thanks.


MergedDictionaries is a property of ResourceDictionary.
Change to:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
...
</ResourceDictionary.MergedDictionaries>
<Style TargetType="{x:Type Rectangle}" />
</ResourceDictionary>
</Application.Resources>

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Use Material Design and Caliburn.Micro simalteniously

I use WPF, and C#. I want to use both :MaterialDesign and Caliburn.Micro v4.0173 in one solution in Visual Studio. I have tried to add both of them to App.xaml, but materialDesign does not work. So the view of controls is the same as if I don't installed materialDesign.
<Application x:Class="WPFUI.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WPFUI">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary>
<local:Bootstrapper x:Key="Bootstrapper"/>
<ResourceDictionary x:Key="MD1" Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
<ResourceDictionary x:Key="MD2" Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
<ResourceDictionary x:Key="MD3" Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.BlueGrey.xaml" />
<ResourceDictionary x:Key="MD4" Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
<ResourceDictionary x:Key="MD5" Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.DataGrid.ComboBox.xaml" />
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>

Application a style to all page xaml wpf

I have a style file "dark.xaml" that I will use to style all xaml pages, so I place it in "application.xaml". But why my xaml page can't to access the style of "dark.xml"?
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/rtwin;component/style/Dark.xaml">
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>

From your ResourceDictionary source it seems that you are adding style from an assembly (correct if I'm wrong).
Well, in that case, you need to add pack://application:,,, so that your final App.xaml should look like this,
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/rtwin;component/style/Dark.xaml">
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>

Where to add ObjectDataProvider in Application.Resources with ResourceDictionary

I followed this Tutorial and got stuck on the Create Instance of Config Settings Class-part. Here they just add the ObjectDataProvider in the Application.Resources. In my case there is already a ResourceDictionary in this context and I think this causes the problem.
My App.xaml:
<Application x:Class="MyApp.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:config="clr-namespace:MyApp.ViewModels"
StartupUri="MainWindow.xaml">
<Application.Resources>
<!-- create instance of config-settings class -->
<ObjectDataProvider x:Key="AppSettingsDataProvider" ObjectType="{x:Type config:AppSettingsManager}"/>
<ResourceDictionary x:Key="MainDictionary">
<!-- also not working: -->
<!--<ObjectDataProvider x:Key="AppSettingsDataProvider" ObjectType="{x:Type config:AppSettingsManager}"/>-->
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/Folder/file1.xaml" />
<ResourceDictionary Source="pack://application:,,,/Folder/file2.xaml" />
<!-- <ResourceDictionary Source="{Binding Source={StaticResource AppSettingsDataProvider}, Path=LoadMethod, Mode=OneWay}"/>-->
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
When I run the program my ResourceDictionary is not loaded anymore (Application.Current.Ressources.MergedDictionaries is empty), without the ObjectDataProvider everything works fine. Putting the ObjectDataProvider in the ResourceDictionary like suggested in the post Problems adding an ObjectDataProvider in resources did not help (is it different in the Application-class?). So where to put the ObjectDataProvider?

Reference ResourceDictionary by key and use it as window/control resource

Is it possible to reference "nested" ResourceDictionary by x:Key instead of relative path?
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary x:Key="MyConstants" Source="Foo/Bar/MyConstants.xaml"/>
<!-- other stuff -->
</ResourceDictionary>
</Application.Resources>
</Application>
MainWindow.xaml
<Window.Resources>
<ResourceDictionary KeyReference="MyConstants"/>
</Window.Resources>

Each Dictionary entry must have an associated key attribute

I am programming w Windows 8.1 App using C# and the MVVM-Light Toolkit from GalaSoft.
All I have is the code below:
<Application.Resources>
<vm:ViewModelLocator x:Key="Locator" xmlns:vm="using:Scedule.ViewModel" />
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Resource Dictionaries/StandardStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
The error "Each Dictionary entry must have an associated key attribute" occurs and only disappears when I either remove
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Resource Dictionaries/StandardStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
or
<vm:ViewModelLocator x:Key="Locator" xmlns:vm="using:Scedule.ViewModel" />
Can anyone tell me what the problem here is?

Note that Application.Resources requires an instance of ResourceDictionary, so you have to do something like this:
<Application.Resources>
<ResourceDictionary>
<vm:ViewModelLocator x:Key="Locator" xmlns:vm="using:Scedule.ViewModel" />
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Resource Dictionaries/StandardStyles.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
So it's not strange at all, it's also not a bug. If you want your ResourceDictionary to be treated as a resource, you of course have to provide some Key for it, however in this case you really want to assign an instance of ResourceDictionary to the Application.Resources

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