Question

I have a UserControl with a ListView inside the ItemTemplate property has a ComboBox i need use two datacontext for this ComboBox

1. ItemsSource DataContext from UserControl
2. SelectedItem DataContext from ListViewItem

how to achieving this?

Answer 1

You can use RelativeSource in your binding to traverse the Visual Tree to find the DataContext for UserControl.

Whereas for ListViewItem, you don’t need RelativeSource since Combobox will inherit the DataContext of its parent which is ListViewItem itself. Your structure would look somewhat like this –

<UserControl>
   <ListView>
       <ListView.ItemTemplate>
           <DataTemplate>
               <ComboBox ItemsSource="{Binding DataContext.CollectionSource,
                          RelativeSource={RelativeSource FindAncestor, 
                                           AncestorType=UserControl}}"
                         SelectedItem="{Binding YourItemHere}"/>
           </DataTemplate>
       </ListView.ItemTemplate>
   </ListView>
</UserControl>