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Cannot remove merged dictionaries from code

I have these dictionaries:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Resources/Languages/English.xaml"/>
<ResourceDictionary Source="Resources/Themes/All.xaml"/>
<ResourceDictionary Source="Resources/Themes/Green.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
I want to remove the dictionaries in C#. Tried these but failed:
this.Resources.MergedDictionaries.Clear();
this.Resources.MergedDictionaries.Remove(this.Resources.MergedDictionaries[0]);
I get this error when I use .Clear() method.

I was able to clear the merged dictionary using this line:
this.Resources.MergedDictionaries[0].Clear();
I then added the wanted dictionary with this line:
this.Resources.MergedDictionaries.Add(languageResourceDictionary);

ResourceDictionary not found in design time

I have some shared resources that I have bundled within a resource dictionary. The following code works as expected (The resources are loaded at design time and intellisense works perfect.):
Alternative 1:
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MyCompany.Helpers.UI;component/Resources/SharedResources.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
At this point I changed the code to:
Alternative 2:
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="{x:Static appCode:DesignResource.GlobalResource}"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
public static class DesignResource
{
public static Uri GlobalResource
{
get { return new Uri("pack://application:,,,/MyCompany.Helpers.UI;component/Resources/SharedResources.xaml"); }
}
}
Now Intellisense only gives me: "An error occured while finding the resource dictionary". Am I missing something? Why does Alternative 2 not work?

Nesting ResourceDictionaries with MergedDictionaries in UWP

I'm trying to split up a ResourceDictionary containing styles for multiple controls in our current UWP application. The file has grown to about 3000 lines and has become a living hell to manage, so I decided to split it up into smaller, more specific ResourceDictionaries and include them using MergedDictionaries.
App.xaml
<common:BootStrapper x:Class="Asteria.Ion.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:common="using:Template10.Common"
xmlns:styles="using:Asteria.Ion.Styles"
RequestedTheme="Dark">
<common:BootStrapper.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Styles\Custom.xaml" />
<ResourceDictionary Source="Styles\CustomControls.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</common:BootStrapper.Resources>
</common:BootStrapper>
CustomControls.xaml contains references to other ResourceDictionaries.
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="using:Template10.Controls"
xmlns:behaviors="using:Template10.Behaviors"
xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
xmlns:local="using:Asteria.Ion.Styles">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Shared.xaml" />
<ResourceDictionary Source="Templates.xaml" />
<ResourceDictionary Source="ComponentBlock.xaml" />
<ResourceDictionary Source="FlowAgent.xaml" />
<ResourceDictionary Source="Planning.xaml" />
<ResourceDictionary Source="ProjectDialog.xaml" />
<ResourceDictionary Source="Inspector.xaml" /-->
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
This will always produce the following exception:
Failed to assign to property 'Windows.UI.Xaml.ResourceDictionary.Source' because the type 'Windows.Foundation.String' cannot be assigned to the type 'Windows.Foundation.Uri'. [Line: 12 Position: 37]
I've tried changing the source URI numerous times, but it keeps giving this error. Only commenting out all the ResourceDictionary elements in CustomControls.xaml helps. But then I get exceptions concerning missing styles of course.
Some URI formats I've tried:
/Styles/Shared.xaml
Styles/Shared.xaml
Styles\Shared.xaml
.\Shared.xaml
ms-appx:///Styles/Shared.xaml
None of them work.
Any advice would be appreciated.

In the end it had nothing to do with the URI structure, but with a combination of ThemeDictionaries and MergedDictionaries.
What was working before:
In App.Resources:
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Styles/Themes.xaml" />
<ResourceDictionary Source="Styles/CustomControls.xaml" />
</ResourceDictionary.MergedDictionaries>
Where Themes.xaml contained ThemeDictionaries and CustomControls.xaml contained <Styles> ( a lot of them ).
After splitting CustomControls.xaml, it no longer contained any styles, but only MergedDictionaries.
Looking something like this:
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="ControlStyles/ProjectDialog.xaml" />
<ResourceDictionary Source="ControlStyles/Inspector.xaml" />
</ResourceDictionary.MergedDictionaries>
Inspector.xaml contained a Style using {ThemeResource} and it appears that's where it went wrong. The solution/work-around in the end was to include a MergedDictionaries with a references to Themes.xaml in Inspector.xaml.
Now if anyone can explain the exact reasoning behind this solution, I'd be much obliged.

From the error message,XAML Compiler failed to translate the Source Property of nested ResourceDictionaries. The easiest and fastest workaround is to add the nested ResourceDictionaries in App.Xaml.cs:
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
...
var applicationMergedDics = Application.Current.Resources.MergedDictionaries;
applicationMergedDics[0].MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("ms-appx:///Styles/Shared.xaml") });
applicationMergedDics[0].MergedDictionaries.Add(new ResourceDictionary() { Source = new Uri("ms-appx:///Styles/Templates.xaml") });
...
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
Notes: Don't forget to remove the MergedDictionaries in CustomControls.xaml. And the error will be gone.

How to add PresentationFramework.Aero theme to ResourceDictionary

I want to add the PresentationFramework.Aero theme to my ResourceDictionary.
The ResourceDictionary itself is in one assembly called ProjectResources. Within this assembly I define all my styles for my project. So this ResourceDictionary is used by several different assemblies in my project. So far it worked fine for all my Dictionaries defined.
Now i want to add the Aero theme. But I always get the exception:
An unhandled exception of type
'System.Windows.Markup.XamlParseException' occurred in
PresentationFramework.dll
Inner Exception:
{"Could not load file or assembly 'PresentationFramework.Aero,
Culture=neutral' or one of its dependencies. The system cannot find
the file specified.":"PresentationFramework.Aero, Culture=neutral"}
The ResourceDictionary is defined like that:
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/ImageDefinition.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/Brushes.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesLabel.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesTextBox.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesButton.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesTabControl.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesTextBox.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesBorder.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesListView.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesWindow.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesIndicator.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesSearchBox.xaml"/>
<ResourceDictionary Source="pack://application:,,,/ProjectResources;component/ProjectResources/Dictionaries/StylesTreeView.xaml"/>
<ResourceDictionary Source="/PresentationFramework.Aero;component/themes/Aero.NormalColor.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
I have also added the reference to PresentationFramework.Aero.dll.
So I don't understand why it cant find the defined theme.
What is the problem with this definition? Did I miss anything else beside this definition to be able to use the theme?
SOLVED:
As toumir said in his comment.
You need to set the parameter
Copy Local = true
of the PresentationFramework.Aero DLL.
By doing that the dll will be copied to the root directory of your program and it will the dll.

I think you need to add the full assembly info to the ResourceDictionary Source:
<ResourceDictionary Source="/PresentationFramework.Aero,Version=3.0.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35,processorArchitecture=MSIL;component/themes/Aero.NormalColor.xaml" />

How to apply styles to all windows in WPF app?

I have the following App.xaml file:
<Application x:Class="MiniDeviceConfig.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MiniDeviceConfig.xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Button.xaml"/>
<ResourceDictionary Source="CheckBox.xaml"/>
<ResourceDictionary Source="ComboBox.xaml"/>
<ResourceDictionary Source="Common.xaml"/>
<ResourceDictionary Source="GroupBox.xaml"/>
<ResourceDictionary Source="Label.xaml"/>
<ResourceDictionary Source="LinkButton.xaml"/>
<ResourceDictionary Source="ListBox.xaml"/>
<ResourceDictionary Source="ListView.xaml"/>
<ResourceDictionary Source="RadioButton.xaml"/>
<ResourceDictionary Source="Tooltip.xaml"/>
<ResourceDictionary Source="Window.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
In my application, my main window is MiniDeviceConfig.xaml (as seen above). In my Button.xaml file, I clearly set the button height to some obscene number. And, this size is reflected in my main window's buttons. However, some action on the main window triggers a modal window that has more buttons on it. I was expecting the same tall buttons but no such luck. How do I get the style to propagate into all windows in the application?

You can try very helpful class ThemeManager from http://wpfthemes.codeplex.com. In our project we had similiar problems and solve it by using it.

Figured it out. There were other resources included that were conflicting.