public static IList <Expression> GetTargetMemberDictionaryElementKeyParts(
            this IMemberMapperData mapperData,
            Expression index)
        {
            var elementContext = mapperData.GetElementMemberContext();

            return(mapperData
                   .MapperContext
                   .UserConfigurations
                   .Dictionaries
                   .GetElementKeyParts(index, elementContext));
        }