public async Task FetchProperties() { var properties = await StorageItem.GetBasicPropertiesAsync(); DateModified = properties.DateModified.ToString(); Size = properties.Size; if (IsFile) { var storageFile = StorageItem as StorageFile; var fileType = storageFile.FileType.ToLower(); Debug.WriteLine(fileType); if (ImageFileTypes.Contains(fileType)) { Thumbnail = await storageFile.GetThumbnailAsync(ThumbnailMode.PicturesView, 110, ThumbnailOptions.UseCurrentScale); } } }