Typed converter

Converter.cs

    public abstract class TypedConverter<TFrom, TTo> : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is TFrom)
                return Convert((TFrom)value);

            return Convert(default(TFrom));
        }

        public abstract TTo Convert(TFrom value);

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }