/* 通过文件夹选择器添加文件夹,并加入FutureAccessList */ private async void AddFolder_Click(object sender, RoutedEventArgs e) { var folderPicker = new Windows.Storage.Pickers.FolderPicker(); folderPicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.Desktop; folderPicker.FileTypeFilter.Add("*"); Windows.Storage.StorageFolder folder = await folderPicker.PickSingleFolderAsync(); if (folder != null) { // Application now has read/write access to all contents in the picked folder // (including other sub-folder contents) string token = Windows.Storage.AccessCache.StorageApplicationPermissions. FutureAccessList.Add(folder); viewModel.FolderAdd(token, folder.Name, await GetNumInFolder(folder)); // 显示新加入文件夹下的视频 showVideoInFolder(token); } }