Business.EditVideoBusiness.Save C# (CSharp) Метод

        public void Save() {
            // Set IsCustomPreference field when updating Preference.
            foreach (var item in context.ChangeTracker.Entries<Media>().Where(e => e.State == EntityState.Modified)) {
                double? OldValue = item.OriginalValues["Preference"] as double?;
                double? NewValue = item.Entity.Preference;
                if (OldValue != NewValue)
                    item.Entity.IsCustomPreference = (NewValue.HasValue);
            }

            context.SaveChanges();
        }

        protected override void OnCompleted(object sender, DownloadCompletedEventArgs e)
        {
            DownloadItemData IData          = e.DownloadInfo.Data as DownloadItemData;
            Media            Video          = IData.Media;
            string           Destination    = e.DownloadInfo.Destination;
            string           DestinationExt = Path.GetExtension(Destination);

            Destination = Destination.Substring(0, Destination.Length - Path.GetExtension(Destination).Length);

            // Ensure download and merge succeeded.
            if (!FileHasContent(e.DownloadInfo.Destination))
            {
                e.DownloadInfo.Status = DownloadStatus.Failed;
                return;
            }

            // Get final file name.
            DefaultMediaPath PathCalc    = new DefaultMediaPath();
            string           NewFileName = PathCalc.GetDefaultFileName(Video.Artist, Video.Title, Video.MediaCategoryId, (MediaType)Video.MediaTypeId);

            Directory.CreateDirectory(Path.GetDirectoryName(Settings.NaturalGroundingFolder + NewFileName));
            Video.FileName = NewFileName + DestinationExt;

            // Move file and overwrite.
            string DstFile = Settings.NaturalGroundingFolder + Video.FileName;

            if (File.Exists(DstFile))
            {
                FileOperationAPIWrapper.MoveToRecycleBin(DstFile);
            }
            File.Move(Destination + DestinationExt, DstFile);

            // Add to database
            EditVideoBusiness Business     = new EditVideoBusiness();
            Media             ExistingData = Business.GetVideoById(Video.MediaId);

            if (ExistingData != null)
            {
                // Edit video info.
                ExistingData.FileName = Video.FileName;
                ExistingData.Length   = null;
                ExistingData.Height   = null;
                Business.Save();
            }
            else
            {
                // Add new video info.
                Business.AddVideo(Video);
                Business.Save();
            }

            base.OnCompleted(sender, e);
        }