WPF: Simplest of DataTriggers

Question

I'm just trying to learn DataTriggers. What's wrong with this simple code? It tells me that "Source" is not a property of FrameworkElement.

<Image>
    <Image.Triggers>
        <DataTrigger Binding="{Binding Status}" Value="Sent">
            <Setter Property="Source" Value="Resources\Approve_64_Trans.bmp"/>
        </DataTrigger>

        <DataTrigger Binding="{Binding Status}" Value="SendFailed">
            <Setter Property="Source" Value="Resources\Cancel_64_Trans.bmp"/>
        </DataTrigger>
    </Image.Triggers>
</Image>

Also, is it correct to use a value "SendFailed" or "Sent" when the Status field is of enum type and SendFailed and Sent are two valid enum values?

Answer 1

You need to put that kind of trigger in a style, like so:

  <Image>
     <Image.Style>
        <Style TargetType="Image">
           <Style.Triggers>
              <DataTrigger Binding="{Binding Status}" Value="Sent">
                 <Setter Property="Source" Value="Resources\Approve_64_Trans.bmp"/>
              </DataTrigger>
              <DataTrigger Binding="{Binding Status}" Value="SendFailed">
                 <Setter Property="Source" Value="Resources\Cancel_64_Trans.bmp"/>
              </DataTrigger>
           </Style.Triggers>
        </Style>
     </Image.Style>
  </Image>