Catel.MVVM.Converters.ValueConverterGroup.GetTargetType C# (CSharp) Метод

        protected virtual Type GetTargetType(int converterIndex, Type finalTargetType, bool convert)
        {
            // If the current converter is not the last/first in the list, 
            // get a reference to the next/previous converter.
            System.Windows.Data.IValueConverter nextConverter = null;
            if (convert)
            {
                if (converterIndex < Converters.Count - 1)
                {
                    nextConverter = Converters[converterIndex + 1];
                    if (nextConverter == null)
                    {
                        throw Log.ErrorAndCreateException<InvalidOperationException>("The Converters collection of the ValueConverterGroup contains a null reference at index: " + (converterIndex + 1));
                    }
                }
            }
            else
            {
                if (converterIndex > 0)
                {
                    nextConverter = Converters[converterIndex - 1];
                    if (nextConverter == null)
                    {
                        throw Log.ErrorAndCreateException<InvalidOperationException>("The Converters collection of the ValueConverterGroup contains a null reference at index: " + (converterIndex - 1));
                    }
                }
            }

            if (nextConverter != null)
            {
                ValueConversionAttribute conversionAttribute = _cachedAttributes[nextConverter];

                // If the Convert method is going to be called, we need to use the SourceType of the next 
                // converter in the list.  If ConvertBack is called, use the TargetType.
                return convert ? conversionAttribute.SourceType : conversionAttribute.TargetType;
            }

            // If the current converter is the last one to be executed return the target type passed into the conversion method.
            return finalTargetType;
        }