BetterCms.Module.MediaManager.Services.DefaultTagService.SaveMediaTags C# (CSharp) 메소드

        public void SaveMediaTags(Media media, IEnumerable<string> tags, out IList<Tag> newCreatedTags)
        {
            var trimmedTags = new List<string>();
            if (tags != null)
            {
                foreach (var tag in tags)
                {
                    trimmedTags.Add(tag.Trim());
                }
            }

            // remove tags who are equal (tags are case insensitive)
            for (int i = 0; i < trimmedTags.Count; i++)
            {
                for (int j = i + 1; j < trimmedTags.Count; j++)
                {
                    if (i != j && trimmedTags[i].ToLowerInvariant() == trimmedTags[j].ToLowerInvariant())
                    {
                        trimmedTags.RemoveAt(j);
                        --j;
                    }
                }
            }

            newCreatedTags = new List<Tag>();

            Tag tagAlias = null;

            // Tags merge:
            var mediaTags =
                unitOfWork.Session.QueryOver<MediaTag>()
                          .Where(t => !t.IsDeleted && t.Media.Id == media.Id)
                          .JoinQueryOver(t => t.Tag, JoinType.InnerJoin)
                          .Where(t => !t.IsDeleted)
                          .List<MediaTag>();

            // Remove deleted tags:
            for (var i = mediaTags.Count - 1; i >= 0; i--)
            {
                var tag = trimmedTags.FirstOrDefault(s => s.ToLower() == mediaTags[i].Tag.Name.ToLower());

                if (tag == null)
                {
                    UpdateModifiedInformation(mediaTags[i]);
                    unitOfWork.Session.Delete(mediaTags[i]);
                }
            }

            // Add new tags:
            var tagsInsert = new List<string>();
            foreach (var tag in trimmedTags)
            {
                var existMediaTag = mediaTags.FirstOrDefault(mediaTag => mediaTag.Tag.Name.ToLower() == tag.ToLower());
                if (existMediaTag == null)
                {
                    tagsInsert.Add(tag);
                }
            }

            if (tagsInsert.Count > 0)
            {
                // Get existing tags:
                var existingTags =
                    unitOfWork.Session.QueryOver(() => tagAlias)
                              .Where(t => !t.IsDeleted)
                              .Where(Restrictions.In(Projections.Property(() => tagAlias.Name), tagsInsert))
                              .List<Tag>();

                foreach (var tag in tagsInsert)
                {
                    var mediaTag = new MediaTag { Media = media };

                    var existTag = existingTags.FirstOrDefault(t => t.Name.ToLower() == tag.ToLower());
                    if (existTag != null)
                    {
                        mediaTag.Tag = existTag;
                    }
                    else
                    {
                        var newTag = new Tag { Name = tag };
                        unitOfWork.Session.SaveOrUpdate(newTag);
                        newCreatedTags.Add(newTag);
                        mediaTag.Tag = newTag;
                        UpdateModifiedInformation(mediaTag);
                    }

                    unitOfWork.Session.SaveOrUpdate(mediaTag);
                }
            }
        }