How to format string in XAML Setter Value?

I have learned how to format strings in the content attribute of a label like this:

<Label Content="{Binding ElementName=theSlider, Path=Value}" 
   ContentStringFormat="The font size is {0}."/>

I want to do the same thing in a Setter but "ValueStringFormat" doesn't exist, what is the correct syntax to do what I want to accomplish here:

<DataTrigger Binding="{Binding Path=Kind}" Value="Task">
    <Setter TargetName="TheTitle" Property="Text" 
       Value="{Binding Title}" 
       ValueStringFormat="Your title was: {0}"/>
</DataTrigger>

From stackoverflow

• I can't test this but hope it works:

  ...
  xmlns:local="clr-namespace:ValueConverter"
  ...
  
  <Window.Resources>
     <local:MyTextConverter x:Key="MyTextConverter" />
  </Window.Resources>
  
  ...
  <DataTrigger Value="Task">
       <DataTrigger.Binding>
          <Binding Converter="{StaticResource MyTextConverter}"
              Path="Kind" />
       </DataTrigger.Binding>
       <Setter TargetName="TheTitle" Property="Text"/>
  </DataTrigger>
  

  where MyTextConverter is a class implementing IValueConverter interface:

  public class PositionConverter : IValueConverter
  {
      public object Convert(object value, Type targetType, object parameter, 
           CultureInfo culture)
      {
          return String.Format("Your title was: {0}", value);
      }
  
      public object ConvertBack(object value, Type targetType, object parameter,
          CultureInfo culture)
      {
          throw new Exception("The method or operation is not implemented.");
      }
  

  Will : This works, but you're taking away the ability of the designer to set the format string.

• Can you simply use the StringFormat property of the Binding itself?

  <DataTrigger Binding="{Binding Path=Kind}" Value="Task">
      <Setter TargetName="TheTitle" Property="Text" 
          Value="{Binding Title,StringFormat='Your title was: {}{0}'}" 
          />
  </DataTrigger>
  

  arconaut : +1, but shouldn't {0} be escaped with 2 curly braces - {} ?

  Matt Hamilton : Indeed! I'll fix it now.