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I have a Styles.xaml that groups many ResourceDictionarys inside a MergedDictionary.
I imported Styles.xaml in my UserControl.Resources
<UserControl.Resources>
<ResourceDictionary Source="Dictionaries\Styles.xaml" />
</UserControl.Resources>
but when I try to add a converter
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionaries\Styles.xaml" /> <--! Exception -->
</ResourceDictionary.MergedDictionaries>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</ResourceDictionary>
</UserControl.Resources>
it raises
ArgumentNullException: Value cannot be null.
Parameter name: item
Wrapping the converter inside another MergedDictionary has no effect.
How can I solve this?
Thank you all!
I eventually figured it out: the Exception was raised inside one the .xaml files, but Visual Studio does not provide enough info to locate the faulty line.
Following code does work.
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Dictionaries\Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</ResourceDictionary>
</UserControl.Resources>
693
To add a merged dictionary through code, you obtain a reference to the desired primary ResourceDictionary , get its MergedDictionaries property value, and call Add on the generic Collection that's contained in MergedDictionaries . The object you add must be a new ResourceDictionary .
Tip You can create a resource dictionary file in Microsoft Visual Studio by using the Add > New Item… > Resource Dictionary option from the Project menu. Here, you define a resource dictionary in a separate XAML file called Dictionary1.
A resource dictionary is a repository for XAML resources, such as styles, that your app uses. You define the resources in XAML and can then retrieve them in XAML using the {StaticResource} markup extension and {ThemeResource} markup extension s. You can also access resources with code, but that is less common.
In Extensible Application Markup Language (XAML), the ResourceDictionary class is typically an implicit collection element that is the object element value of several Resources properties, when given in property element syntax.
Try this
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/PROJECTNAMESPACE (TestProject.Something);component/Dictionaries/Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</ResourceDictionary>
</UserControl.Resources>
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