AutoMapper.TypeMap.GetUnmappedPropertyNames C# (CSharp) Method

        public string[] GetUnmappedPropertyNames()
        {
            Func<PropertyMap, string> getFunc =
                pm =>
                    ConfiguredMemberList == MemberList.Destination
                        ? pm.DestinationProperty.Name
                        : pm.CustomExpression == null && pm.SourceMember != null
                            ? pm.SourceMember.Name
                            : pm.DestinationProperty.Name;
            var autoMappedProperties = _propertyMaps.Where(pm => pm.IsMapped())
                .Select(getFunc).ToList();
            var inheritedProperties = _inheritedMaps.Where(pm => pm.IsMapped())
                .Select(getFunc).ToList();

            IEnumerable<string> properties;

            if (ConfiguredMemberList == MemberList.Destination)
            {
                properties = DestinationTypeDetails.PublicWriteAccessors
                    .Select(p => p.Name)
                    .Except(autoMappedProperties)
                    .Except(inheritedProperties);
            }
            else
            {
                var redirectedSourceMembers = _propertyMaps
                    .Where(pm => pm.IsMapped() && pm.SourceMember != null && pm.SourceMember.Name != pm.DestinationProperty.Name)
                    .Select(pm => pm.SourceMember.Name);

                var ignoredSourceMembers = _sourceMemberConfigs
                    .Where(smc => smc.IsIgnored())
                    .Select(pm => pm.SourceMember.Name).ToList();

                properties = SourceTypeDetails.PublicReadAccessors
                    .Select(p => p.Name)
                    .Except(autoMappedProperties)
                    .Except(inheritedProperties)
                    .Except(redirectedSourceMembers)
                    .Except(ignoredSourceMembers);
            }

            return properties.Where(memberName => !IgnorePropertiesStartingWith.Any(memberName.StartsWith)).ToArray();
        }