Question

I’m creating a DataTemplate in WPF, so it won’t compile if I use x:Name. This is the relevant part of my code:

<DataTemplate>
    <StackPanel>
        <Image .../>
        <Textbox Width={Binding to image?, Path=ActualWidth} />
    </StackPanel>
</DataTemplate>

How can I bind to the Image without the use of name?

Answer 1

You can use RelativeSource:

<DataTemplate>
      <StackPanel>                        
          <Image Source="{Binding Photo}"/>
          <TextBox Width="{Binding Path=Children[0].ActualWidth, Mode=OneWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=StackPanel, AncestorLevel=1}}" />
       </StackPanel>
</DataTemplate>

You can’t directly binding to Image but you can do that with StackPanel and property Children.