Question

I have a 4-level tree structure, defined by:

<HierarchicalDataTemplate DataType='{x:Type src:Level1}' ItemsSource='{Binding Path=Level2Items}'>     <TextBlock Text='{Binding Path=Level1Name}'/> </HierarchicalDataTemplate>  <HierarchicalDataTemplate DataType='{x:Type src:Level2}' ItemsSource='{Binding Path=Level3Items}'>     <TextBlock Text='{Binding Path=Level2Name}'/> </HierarchicalDataTemplate>  <HierarchicalDataTemplate DataType='{x:Type src:Level3}' ItemsSource='{Binding Path=Level4Items}'>     <TextBlock Text='{Binding Path=Level3Name}'/> </HierarchicalDataTemplate> <DataTemplate DataType='{x:Type src:Level4}'>     <TextBlock Text='{Binding Path=Level4Name}'/> </DataTemplate> 

And it works great. The only thing is, I can’t programmatically select any of my bound items, because they’re not of type TreeViewItem (and therefore don’t have the ‘IsSelected’ property). Is there a way to automatically wrap databound items in a particular container type (in this case: TreeViewItem)?

Answer 1

If your items are in a TreeView, they’ll be wrapped in a TreeViewItem automatically by the TreeView‘s ItemContainerGenerator. You can do something like this to ensure the IsSelected property on TreeViewItem maps to a property on your data class:

<TreeView>     <TreeView.ItemContainerStyle>         <Style TargetType='TreeViewItem'>             <Setter Property='IsSelected' Value='{Binding MyIsSelectedProperty}'/>         </Style>     </TreeView.ItemContainerStyle> </TreeView>