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Asked: 2026-05-10T13:50:20+00:00

I’m getting all learned up about binding in WPF. I’m having a lot of

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I’m getting all learned up about binding in WPF. I’m having a lot of trouble debugging the parse errors in my xaml, though. Can somebody pretty please tell me what’s wrong with this little piece? :

<Border Name='TrackBackground'     Margin='0'     CornerRadius='2'                          Grid.Row='1'     Grid.Column='1'     Background='BlanchedAlmond'     BorderThickness='1'     Height='{TemplateBinding Height}'>      <Canvas Name='PART_Track' Background='DarkSalmon' Grid.Row='1' Grid.Column='1'>         <Thumb Name='ThumbKnob' Height='{Binding ElementName=Part_Track, Path=Height, Mode=OneWay}' />     </Canvas> </Border>

It’s the databinding that breaks. I get an InvalidAttributeValue exception for ThumbKnob.Height when I try to run this. I know I must be missing something fundamental. So fill me in, stackers, and my gratitude will be boundless.

Changing the ElementName didn’t help. There must me something else I’m not getting.

I should mention that I’m testing this in Silverlight. The exact message I’m getting out of Internet Explorer is:

XamlParseException: Invalid attribute value for property Height.

This whole thing is inside a ControlTemplate. I’m making a slider control just to teach myself the concepts.

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1 Answer

  1. The ElementName property on a Binding is not supported in Silverlight.

    You will notice, if you go into the code behind or inspect the Binding object in class explorer, it doesn’t have a property named ElementName.

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