TextBlock: Binding of Text and StringFormat

Question

Is it possible to bind Text and StringFormat too?

<TextBlock Text="{Binding Path=Price, StringFormat={Binding Path=DecimalPoints}}" />

DecimalPoints is constantly changing from F0 to F15. Unfortunatelly the code above doesn't compile.

Answer 1

I think your best bet is definitely a converter. Then your binding would look like this:

<TextBlock.Text>
   <MultiBinding Converter="{StaticResource StringFormatConverter }">
      <Binding Path="Price"/>
      <Binding Path="DecimalPoints"/>
   </MultiBinding>
</TextBlock.Text>

Then a quick converter (you can certainly make it nicer, but this is the general idea).

    public class StringFormatConverter : IMultiValueConverter
    {
      #region IMultiValueConverter Members

      public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
      {
          double number = (double)values[0];
          string format = "f" + ((int)values[1]).ToString();
          return number.ToString(format);
      }

      public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
      {
        throw new NotImplementedException();
      }

      #endregion
    }