private async Task StartLoadFile() { IsNewStart = false; SecureFolder = await ApplicationData.Current.LocalCacheFolder.CreateFolderAsync("SecureFolder", CreationCollisionOption.OpenIfExists); QueryOptions Options = new QueryOptions { FolderDepth = FolderDepth.Shallow, IndexerOption = IndexerOption.UseIndexerWhenAvailable }; Options.SetThumbnailPrefetch(ThumbnailMode.ListView, 100, ThumbnailOptions.ResizeThumbnail); Options.SetPropertyPrefetch(PropertyPrefetchOptions.BasicProperties, new string[] { "System.ItemTypeText", "System.ItemNameDisplayWithoutExtension", "System.FileName", "System.Size", "System.DateModified" }); StorageItemQueryResult ItemQuery = SecureFolder.CreateItemQueryWithOptions(Options); IReadOnlyList <IStorageItem> EncryptedFileList = await ItemQuery.GetItemsAsync(0, 100); if (EncryptedFileList.Count == 0) { EmptyTips.Visibility = Visibility.Visible; } SecureGridView.Visibility = Visibility.Visible; foreach (var Item in EncryptedFileList) { var Size = await Item.GetSizeRawDataAsync().ConfigureAwait(true); var Thumbnail = new BitmapImage(new Uri("ms-appx:///Assets/LockFile.png")); var ModifiedTime = await Item.GetModifiedTimeAsync().ConfigureAwait(true); SecureCollection.Add(new FileSystemStorageItemBase(Item as StorageFile, Size, Thumbnail, ModifiedTime)); } await SecureCollection.SetStorageQueryResultAsync(ItemQuery).ConfigureAwait(false); }