Forward declaration in XAML to resolve circular dependency of DataTemplate

Question

I want to use a HierarchicalDataTemplate with a DataTemplateSelector but I get trouble with the order:

<UserControl.Resources>
    <HierarchicalDataTemplate x:Key="TemplateA"
                              ItemsSource="{Binding AnySource}"
                              ItemTemplateSelector="{StaticResource MyTemplateSelector}" >
        <Label Content="A" />
    </HierarchicalDataTemplate>

    <DataTemplate x:Key="TemplateB">
        <Label Content="B" />
    </DataTemplate>

    <viewmodel:MyTemplateSelector 
        TemplateA="{StaticResource TemplateA}" 
        TemplateB="{StaticResource TemplateB}" 
        x:Key="MyTemplateSelector" />

    <HierarchicalDataTemplate x:Key="TemplateC"
                              ItemsSource="{Binding AnotherSource}"
                              ItemTemplateSelector="{StaticResource MyTemplateSelector}">
        <Label Content="C" />
    </HierarchicalDataTemplate>
</UserControl.Resources>
<Grid>
    <TreeView 
        ItemsSource="{Binding Source={StaticResource SomeList}}"
        ItemTemplate="{StaticResource TemplateC}"/>
</Grid>

MyTemplateSelector depends on TemplateA and TemplateA depends on MyTemplateSelector. I get a System.Windows.Markup.XamlParseException at Runtime. Is there a way of forward declaration in XAML or is there a different solution?

Solution: I've found the Solution: I don't need to set the TemplateSelector in TemplateA because it is set in the parent DataTemplate. Sometimes it can be so simple...

Answer 1

[It seems that you overcame the issue by not loading the resource. I'll still post the answer for future readers]

You can use DynamicResource instead of StaticResource.

This only works if you populate a dependency property, i.e. Binding.Converter="{DynamicResource MyConverter}" will not work since Binding.Converter is not a dependency property.