Binding to element in WPF: can the Path expression do math?

Question

I'm trying to bind a control to the parent's Height/width property using ElementName and a Path. However, I don't want to bind to the actual height, but to exactly half the height. Can the Path expression do the math?

e.g. Path={ActualHeight/2}

I couldn't find a way to do that. IS there any other clever approach?

Thanks!

Answer 1

I use a MathConverter to do math in my XAML bindings.The converter code can be found here and it is used like this:

Height="{Binding ElementName=RootWindow, Path=ActualHeight,                  Converter={StaticResource MathConverter},                  ConverterParameter=@VALUE/2}" 

It will also handle more advanced math equations like

Height="{Binding ElementName=RootWindow, Path=ActualHeight,                 Converter={StaticResource MathConverter},                 ConverterParameter=((@VALUE-200)*.3)}" 

Answer 2

No it can't you should use binding converters

public class MyConverter : IValueConverter { public object Convert(object value, Type  targetType,       object parameter, CultureInfo culture)   {       return (int)value/2;   }    public object ConvertBack(object value, Type targetType,       object parameter, CultureInfo culture)   {     return null;   } }