//打开文件选择器FolderPicker pick = new FolderPicker();pick.FileTypeFilter.Add(".png");pick.FileTypeFilter.Add(".jpg");pick.FileTypeFilter.Add(".bmp");IAsyncOperation<StorageFolder> folderTask = pick.PickSingleFolderAsync();StorageFolder folder = await folderTask;//var folder = await pick.PickSingleFolderAsync();StorageFolder Folder = null;string Address;string Token = "";if (folder != null){Folder = folder;Address = folder.Path;Token = StorageApplicationPermissions.FutureAccessList.Add(folder);}StorageApplicationPermissions.FutureAccessList.GetFolderAsync(Token);//获取本地文件夹StorageFolder folderLocal = ApplicationData.Current.LocalFolder;//创建一个文件夹accounttry{folderLocal = await folderLocal.GetFolderAsync(folderStr);}catch (FileNotFoundException){folderLocal = await folderLocal.CreateFolderAsync(folderStr);}StorageFile file = await folderLocal.CreateFileAsync(
folderStr + ".json", CreationCollisionOption.ReplaceExisting);//保存选择的文件夹Tokenvar json = JsonSerializer.Create();ImagePath imagePath = new ImagePath { Id = DateTime.Now.ToString("yyMMddHHmmss"), Path = Token };string imageJson = imagePath.Stringify();if (file != null){try{using (StorageStreamTransaction transaction = await file.OpenTransactedWriteAsync()){using (DataWriter dataWriter = new DataWriter(transaction.Stream)){dataWriter.WriteInt32(Encoding.UTF8.GetByteCount(imageJson));dataWriter.WriteString(imageJson);transaction.Stream.Size = await dataWriter.StoreAsync();await transaction.CommitAsync();}}}catch (Exception ex){throw ex;}}            

            StorageFile fileLocal = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appdata:///local/account/" + ImageHelper.folderStr + ".json"));if (fileLocal != null){try{//读取本地文件内容，并且反序列化using (IRandomAccessStream readStream = await fileLocal.OpenAsync(FileAccessMode.Read)){using (DataReader dataReader = new DataReader(readStream)){UInt64 size = readStream.Size;if (size <= UInt32.MaxValue){await dataReader.LoadAsync(sizeof(Int32));Int32 stringSize = dataReader.ReadInt32();await dataReader.LoadAsync((UInt32)stringSize);string fileContent = dataReader.ReadString((uint)stringSize);ImagePath imagePath = new ImagePath(fileContent);StorageFolder folder = await StorageApplicationPermissions.FutureAccessList.GetFolderAsync(imagePath.Path);//筛选图片var queryOptions = new Windows.Storage.Search.QueryOptions();queryOptions.FileTypeFilter.Add(".png");queryOptions.FileTypeFilter.Add(".jpg");queryOptions.FileTypeFilter.Add(".bmp");var query = folder.CreateFileQueryWithOptions(queryOptions);var files = await query.GetFilesAsync();ImagePath img;imgList = new ObservableCollection<ImagePath>();foreach (var item in files){IRandomAccessStream irandom = await item.OpenAsync(FileAccessMode.Read);//对图像源使用流源BitmapImage bitmapImage = new BitmapImage();bitmapImage.DecodePixelWidth = 160;bitmapImage.DecodePixelHeight = 100;await bitmapImage.SetSourceAsync(irandom);img = new ImagePath();img.Path = item.Path;img.File = bitmapImage;img.Storage = item;imgList.Add(img);}imageView.ItemsSource = imgList;}}}}catch (Exception exce){await new MessageDialog(exce.ToString()).ShowAsync();throw exce;}}