RelativeSource binding doesn't work.

Question

I'm not sure why RelativeSource binding is not working, but the TemplateBinding is working.
I'm just using the Namer dependency property as a test. It is of type string.
Reading the docs, the RelativeSource TemplatedParent is basically the same as TemplateBinding, so it SHOULD work.

<Style
        TargetType="local:Calendar">
        <Setter
            Property="Template">
            <Setter.Value>
                <ControlTemplate
                    TargetType="local:Calendar">
                    ...
                        <Grid>
                            ...
                                <TextBlock
                                    Grid.Column="1"
                                    Text="{Binding Path=Namer,RelativeSource={RelativeSource TemplatedParent},
                                    Mode=TwoWay}" />
                                <TextBlock
                                    Grid.Column="2"
                                    Text="{TemplateBinding Namer}" />
    ...
    </Style>

Answer 1

Hi,

Please first check the sample XAML data binding sample.

Meanwhile, please read through Data binding with XAML for more details.

Otherwise, please share more snippets for investigation.

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Best wishes,

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Robin [MSFT]
MSDN Community Support | Feedback to us
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Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 2

I think it is a bug, as I ran into the same issue.  I had to change my code to use template binding instead.  I wish the option was removed since it does not work.

thanks.

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Sergey

Answer 3

it looks like a bug. I can reproduce it. I've found 2 workarounds:

- use TemplateBinding

- if you need ValueConverter, the TemplateBinding won't work. In such case you'll have to set DataContext to the owning control in code. I.e. somewhere in your Calendar control write DataContext = this;. Then, remove RelatedSource part from your xaml.

I believe that it must be fixed by MS, or at least they must document all binding-related changes.

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notacat

Answer 4

I noticed it´s not working in ControlTemplates of custom controls in ShareTargets. If the same control is hosted on a UserControl inside the application and is binding to the same Model in xaml, it is working…. I also would consider this a bug.

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lh

Answer 5

I posted this issue to MS connect : https://connect.microsoft.com/VisualStudio/feedback/details/741181/relativesource-templatedparent-binding-doesnt-work-in-metro-applications. Please, vote for it.

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notacat