Trouble referencing a Resource Dictionary that contains a Merged Dictionary

by

Answered a similar question here earlier, see Adding a Merged Dictionary to a Merged Dictionary question.

This is an optimization bug, see Microsoft Connect / DefaultStyleKey style not found in inner MergedDictionaries:

On the creation of every object in
XAML, if a default style is present
(i.e. style w/ a key of Type) that
style should be applied. As you can
imagine there are several performance
optimizations to make that (implied)
lookup a light weight as possible. One
of them is that we don’t look inside
Resource Dictionaries unless they are
flagged as “containing default
Styles”. There is a bug: if all your
default styles are nested in merged
dictionaries three levels deep (or
deeper) the top dictionary does not
get flagged so the search skips it.
The work around is to put a default
Style to something, anything, in the
root Dictionary.

So adding a dummy style to the root dictionary fixes this. Example

<Application x:Class="MyApp.App"  
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">  
    <Application.Resources> 
        <ResourceDictionary> 
            <ResourceDictionary.MergedDictionaries> 
                <ResourceDictionary 
                    Source="/CommonLibraryWpfThemes;component/Themes/Generic.xaml" /> 
                </ResourceDictionary.MergedDictionaries> 
            <!-- Dummy Style, anything you won't use goes --> 
            <Style TargetType="{x:Type Rectangle}" /> 
        </ResourceDictionary> 
    </Application.Resources> 
</Application>

More Related Contents:

  1. What is so special about Generic.xaml?
  2. Where can I download Microsoft’s standard WPF themes from? [closed]
  3. Binding as a Resource
  4. WPF Events in ResourceDictionary for a ControlTemplate
  5. Adding a Merged Dictionary to a Merged Dictionary
  6. Binding ConverterParameter
  7. How do you bind a CollectionContainer to a collection in a view model?
  8. ResourceDictionary in a separate assembly
  9. {x:Null} vs. Transparent?
  10. WPF: Slider with an event that triggers after a user drags
  11. Set a property of a nested element in an WPF style
  12. Are “{Binding Path=.}” and “{Binding}” really equal
  13. How can I style the border and title bar of a window in WPF? [duplicate]
  14. WPF Some styles not applied on DataTemplate controls
  15. WPF – Global Style?
  16. How to open a WPF Popup when another control is clicked, using XAML markup only?
  17. WPF Animation “Cannot freeze this Storyboard timeline tree for use across threads”
  18. Implement INotifyPropertyChanged on generated Entity Framework classes
  19. How to autosize and right-align GridViewColumn data in WPF?
  20. WPF C# button style
  21. Binding [VisualStateManager] view state to a MVVM viewmodel?
  22. Advanced XAML Animation effects. Pulse, Marching ants, Rotations. Alerts
  23. Any free WPF themes? [closed]
  24. HorizontalAlignment=Stretch, MaxWidth, and Left aligned at the same time?
  25. Load a ResourceDictionary from an assembly
  26. Interaction Triggers in Style in ResourceDictionary WPF
  27. App.xaml file does not get parsed if my app does not set a StartupUri?
  28. Dynamically loading resource dictionary files to a wpf application gives an error
  29. How to access a control from a ContextMenu menuitem via the visual tree?
  30. How can I tell my DataTemplate to bind to a property in the PARENT ViewModel?

Leave a Comment