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Editorial Team
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Asked: 2026-05-18T21:45:51+00:00

Hi I am using an interface IFooNode, which is part of a tree. I

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Hi I am using an interface IFooNode, which is part of a tree.
I wanted to display this tree in a TreeView using a HierarchicalDataTemplate.
This however does not work due to the interface.
I see two ways around that neither are what I would call “nice”

  1. Find out what type really implements IFooNode (let’s call it FooNode…), then find the assembly defining FooNode, add a Reference to that assembly and create a HierarchicalDataTemplate for FooNode (hoping the Implementating class never changes…)

  2. Write a class MyCoolIFooNodeWrapperForWpf that wraps IFooNode, do not bind to the tree, but fill a list of MyCoolIFooNodeWrapperForWpf from the tree root and create a HierarchicalDataTemplate for MyCoolIFooNodeWrapperForWpf.

Can I somehow always apply a HierarchicalDataTemplate, no matter what type the data is (This I think would be the lesser evil…)

Any other Ideas?

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1 Answer

  1. Editorial Team

    You can use ItemTemplateSelector. In the selector’s code you can check which interface your data object implements, and select the appropriate DataTemplate/HeirarchicalDataTemplate for this item.

    The selector can both be applied to the container itself (ItemsControl.ItemTemplateSelector) and to your hierarchical data template (HeirarchicalDataTemplate.ItemTemplateSelector).

    I think this is the lesser evil.

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