protected override object Convert(object[] values, Type targetType)
{
if (backConversionType == null)
{
backConversionType = targetType;
}
errorHandler.ClearError();
return(ObjectToObjectConverter.Coerce(calculator.Resolve(values), targetType, true));
}
protected override object CoerceAfterConvert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (externalConverter != null)
{
return(externalConverter.Convert(value, targetType, parameter, culture));
}
if (value == DependencyProperty.UnsetValue && targetType == typeof(string))
{
value = null;
}
else
{
value = ObjectToObjectConverter.Coerce(value, targetType, true);
}
return(base.CoerceAfterConvert(value, targetType, parameter, culture));
}