从DataTemplate绑定到ItemsControl的DataContext

Question

I'm using an ItemsControl, boiled down, in this way:

<UserControl.Resources>
  <DataTemplate x:Key="HomeItemTemplate">
    <UserControl Command="{Binding DataContext.MyCommand}"/>
  </DataTemplate>
</UserControl.Resources>

<ItemsControl ItemTemplate="{StaticResource HomeItemTemplate}" />

Now, the view this ItemsControl is placed in has a DataContext. In that DataContext I have my MyCommand. I have to use this ItemsControl in multiple places, so directly referencing to an ElementName within the DataTemplate is something I don't want to do.

I tried TemplatedParent and RelativeSource, different stuff, I don't know what exactly I should do. How would I have to write this so my UserControl can bind to the DataContext of the ItemsControl?

Answer 1

If you have a DataTemplate / ItemTemplate in a resource dictionary, you might want to use the {RelativeSource FindAncestor} binding mode to bind to properties of the parent ItemsControl :

<UserControl.Resources>
  <DataTemplate x:Key="HomeItemTemplate">
    <UserControl Command="{Binding DataContext.MyCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}}"/>
  </DataTemplate>
</UserControl.Resources>