WPF Binding parent property in HierarchicalDataTemplate

Question

I have a WPF TreeView with 2 levels of data and 2 HierarchicalDataTemplate to format each level. From the HierarchicalDataTemplate at the second level, I need to bind a property in the class of the first level. I have tried in this way, but it dosn't work:

Text="{Binding Path=Ori, RelativeSource={RelativeSource TemplatedParent}}"

with Ori as the name of the propery

Even in this way it dosn't works:

Text="{Binding Path=tOri, RelativeSource={RelativeSource TemplatedParent}}"

with tOri as the name of the TextBlock in the fisrt HierarchicalDataTemplate that bind the Ori propery.

Can you help me?

Answer 1

TemplatedParent only refers to the parent Control inside a ControlTemplate and so doesn't work with DataTemplates. You can use FindAncestor instead to locate the parent TreeViewItem and then access its DataContext.

Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeViewItem}, AncestorLevel=2}, Path=DataContext.Ori}"