Why don't styles work at runtime in wpf when using multiple MergedDictionaries?

Question

If I use MergedDictionaries several times to define styles, it does not work at run time, but in WPF Designer VS2010 it works. It also works if the MergedDictionaries load uses code at runtime.

Why is this happening? Is this my problem only? And how to solve it?

I am using WPF4 and loading themes/styles from an assembly at application level.

Does not work

<!--Application.xaml-->
 <Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/Lib;component/Themes/Theme.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>


<!--Theme.xaml-->
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ResourceDictionary.MergedDictionaries>
    <ResourceDictionary Source="Theme/Shared.xaml" />
    <ResourceDictionary Source="Theme/Button.xaml" />
</ResourceDictionary.MergedDictionaries>

AT

<Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/Lib;component/Themes/Theme/Shared.xaml" />
                <ResourceDictionary Source="pack://application:,,,/Lib;component/Themes/Theme/Button.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>

Answer 1

See the answer to this question . I feel like you have the same problem.

This is an optimization error, see this link

XAML, (.. ), . , , () , . , , " ". : ( ), , . , -, , .

, .

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/Lib;component/Themes/Theme.xaml" />
        </ResourceDictionary.MergedDictionaries>
        <!-- Dummy Style, anything you won't use goes -->
        <Style TargetType="{x:Type Rectangle}" />
    </ResourceDictionary>
</Application.Resources>