Null-conditional operator support and null

[maurosampietro]

To calculate the visibilty of a control i'm using CalcBinding something like 'A?.B?.C > 0'.

I get a binding error saying "Value produced by BindingExpression is not valid for target property.; Value=''"

I also tried 'A != null and A.B != null and A.B.C > 0' but i can't get it to work.

So the question: is Null-conditional operator supported? Is it null supported in comparisons?

Thanks

P.S. - A naive converter works just fine

public class CarouselVisibility : BaseConverter, IValueConverter
{
   public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
   {
       var vm = value as ViewModel;
       return vm?.A?.B?.C?.Count > 0 ? Visibility.Visible : Visibility.Collapsed;
   }
   public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture )
   {
      throw new NotImplementedException();
   }
}

[keytrap-x86]

Try

'A != {x:Null} and A.B != {x:Null} and A.B.C > 0'  

[maurosampietro]

This is some 3 years late but thanks anyway.

On 13 Dec 2020, at 22:18, Keytrap [email protected] wrote:

 Try

'A != {x:Null} and A.B != {x:Null} and A.B.C > 0'
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[keytrap-x86]

I discovered CalcBindings yesterday. Hope it'll help some futur readers