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What exactly does WPF Data Binding's "RelativeSource FindAncestor" do?

Answer 1

+2 A:

The best way is to give a name to UserControl

Create dependency property MyProperty in UserControl with two way binding and bind it in main Window, than bind in UserControl like this

<UserControl x:Name = "myControl">
     <Label Content={Binding ElementName= myControl, Path=MyProperty}/>
</UserControl>

ArsenMkrt 2009-10-28 12:04:39

But I want to bind to a property on the containing Window (defined in another XAML file), not on the UserControl.

Paul Baker 2009-10-28 12:07:04

Than it will be better to have property in usercontrol and bind that property with window's property

ArsenMkrt 2009-10-28 12:09:18

Can you create dependency property in UserControl? don't you add usercontrol in window? <UserControl MyProperty = {...binding with window's property }/>

ArsenMkrt 2009-10-28 12:16:00

I see, thanks. But does anyone know why FindAncestor does not "just work"? Is its scope limited in some way, say, to within a single XAML file?

Paul Baker 2009-10-28 12:18:24

do you try AncestorType={x:Type YourWindowType} instead of Window?

ArsenMkrt 2009-10-28 12:29:13

I did try that - it still did not work.

Paul Baker 2009-10-28 12:53:56

I don't know why it is not working to be honest, however my answer is better solution because parent type can be changed during development time

ArsenMkrt 2009-10-28 12:59:10

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What exactly does WPF Data Binding's "RelativeSource FindAncestor" do?

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