How do we pass the `BindingContext` of a `DataTemplate` as a `CommandParameter` when parent has a separate `BindingContext`?

Question

How do we pass the BindingContext of a DataTemplate as a CommandParameter when parent has a separate BindingContext?

Normally I just do CommandParameter={Binding .} but because the parent view has it's own BindingContext it passes that context through. Hopefully this makes sense.

Example XAML code:

<DataTemplate x:Key="dataTemplateRoot" x:DataType="models:ThoughtEntryContainer">
    <StackLayout
        x:Name="NTStackLayout"
        HeightRequest="{Binding MaxHeight}">
            <Editor
                    Text="{Binding thought}">
                    <Editor.Behaviors>
                            <xct:EventToCommandBehavior Command="{Binding Path=BindingContext.SetHeightsCommand, Source={x:Reference rootView}}" EventName="SizeChanged">
                                    <xct:EventToCommandBehavior.CommandParameter>
                                            <MultiBinding Converter="{StaticResource MultiConverter}">
                                                    <Binding Source="{x:Static models:ThoughtEntryType.NegativeThought}" />
                                                    <Binding Source="{Binding .}" /> <!-- This is where I want to pass dataTemplateRoot's BindingContext -->
                                                    <Binding Source="{x:Reference NTStackLayout}" />
                                            </MultiBinding>
                                    </xct:EventToCommandBehavior.CommandParameter>
                            </xct:EventToCommandBehavior>
                    </Editor.Behaviors>
            </Editor>
    </StackLayout>
</DataTemplate>

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Please change: <Binding Source="{Binding Source={RelativeSource AncestorType={x:Type models:ThoughtEntryContainer}}}" /> to <Binding />.

Best Regards,

Leon Lu

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