public Expression GetTargetMemberDictionaryEnumerableElementKey(Expression index, IMemberMapperData mapperData)
        {
            var keyParts        = mapperData.GetTargetMemberDictionaryKeyParts();
            var elementKeyParts = MapperData.GetTargetMemberDictionaryElementKeyParts(index);

            foreach (var elementKeyPart in elementKeyParts)
            {
                keyParts.Add(elementKeyPart);
            }

            return(TargetMemberKey = keyParts.GetStringConcatCall());
        }