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DataTemplateSelector does not work if ItemContainerStyle is set

I have two lists, default and custom. One is using the DataTemplateSelector correctly, and the other is simply using the standard DataTemplates that never call the selector;

//shows correctly
<ListBox Name="testlb" ItemTemplateSelector="{StaticResource ffDataTemplateSelector}"/>

//now showing correctly (using default DataTemplates instead of selector)
<local:FFBox x:Name="myFFBox" ItemTemplateSelector="{StaticResource ffDataTemplateSelector}" ItemContainerStyle="{StaticResource FFItemStyle}" />

Both have the same source

testlb.ItemsSource = CollectionViewSource.GetDefaultView(FileCollectionView);
myFFBox.ItemsSource = CollectionViewSource.GetDefaultView(FileCollectionView);

Obviously there is nothing wrong with the DataTemplateSelector as it works correctly on testlb

The problem ItemContainerStyle="{StaticResource FFItemStyle}"

I am using is to define the overall look of each ListBoxItem contains triggers, animations, etc. If present, the selector does not work.

<Style x:Key="FFItemStyle" TargetType="{x:Type ListBoxItem}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="ListBoxItem">
         <Grid x:Name="mygrid">
           <ContentPresenter x:Name="ContentPresenter" 
              Content="{TemplateBinding Content}"                                          
              ContentTemplate="{TemplateBinding ContentTemplate}"/>

How can I keep the ItemContainerStyle and still be able to modify the DataTamplates using the DataTemplateSelector?

EDIT: Solved, we have to keep it as it is one of those illogical and not quite documented things in wpf.

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2 answers


Got it: If you have ItemContainerStyle defined, instead of ItemTemplateSelector you need to use ContentTemplateSelector in ContentPresenter using DataTemplateSelector.



<ContentPresenter x:Name="ContentPresenter"  Content="{TemplateBinding  Content}"
               ContentTemplateSelector="{StaticResource ffDataTemplateSelector}"
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mmm code looks ok, but you tried to set ItemTemplateSelector like this.

in Generic.xaml

<Setter Property="ItemTemplateSelector">
        <Setter.Value>
            <helpers:ffDataTemplateSelector x:Name="ffDataTemplateSelector" />
        </Setter.Value>
    </Setter>


where helpers are installed the same way at the top of Generic.xaml

xmlns:helpers="using:[Namespace where ffDataTemplateSelector resides]"
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