FloydPink.Flickr.Downloadr.UI.BrowserWindow.SelectAlreadySelectedPhotos C# (CSharp) Method

        private void SelectAlreadySelectedPhotos()
        {
            if (!AllSelectedPhotos.ContainsKey(Page) || AllSelectedPhotos[Page].Count <= 0) return;
            List<Photo> photos = Photos.Where(photo => AllSelectedPhotos[Page].ContainsKey(photo.Id)).ToList();
            foreach (Photo photo in photos)
            {
                ((ListBoxItem) PagePhotoList.ItemContainerGenerator.ContainerFromItem(photo)).IsSelected = true;
            }
        }