获取 Windows 8 商店/metro 应用程序中某些文件扩展名的所有路径

Question

问题

我想在 WINDOWS 8 STORE (TABLET) 应用程序中从文件夹中获取具有“自定义”文件扩展名（.pssm 和 .pnsm）的文件的所有路径，以及它的每个子文件夹（深度搜索） .

---

步骤

1. 选择带有FolderPicker的父文件夹，并保存文件夹路径字符串

   private async void BrowseButton_Tapped(object sender, TappedRoutedEventArgs e)
   {
       FolderPicker fPicker = new FolderPicker();
   
       fPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
       fPicker.FileTypeFilter.Add(".pnsm");
       fPicker.FileTypeFilter.Add(".pssm");
   
       StorageFolder sFolder = await fPicker.PickSingleFolderAsync();
   
       if (sFolder != null)
       {
           StorageApplicationPermissions.FutureAccessList.AddOrReplace("PickedFolderToken", sFolder);
           (DataContext as MainPageVM).ParentFolder = sFolder.Path;
       }
   }
   

2. 在之前保存的文件夹路径字符串及其子文件夹下搜索所有扩展名为 .pssm 或 .pnsm 的文件。

---

问题

第二步怎么做？

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其他详情

这就是我在我的桌面应用程序版本（桌面XAML应用程序，不是windows 8 one）中的做法，也许它可以作为参考（我不知道如何适应它以适应win 8应用程序）。

    private async void ButtonRefresh_Click(object sender, RoutedEventArgs e)
    {
        //http://www.codeproject.com/Messages/4762973/Nice-article-and-here-is-Csharp-version-of-code-fr.aspx

        counter = 0;
        string s = (DataContext as MainWindowVM).ParentFolder;
        List<string> exts = (DataContext as MainWindowVM).ExtensionToSearch;

        Action<int> progressTarget = new Action<int>(ReportProgress);
        searchProgress = new Progress<int>(progressTarget);

        List<string> queriedPaths =
            await Task.Run<List<string>>(() => GetAllAccessibleFiles(s, exts, searchProgress));

        (DataContext as MainWindowVM).RefreshList(queriedPaths);
        SaveSearch();

        progressText.Text += "(Search Completed)";
    }

    private List<string> GetAllAccessibleFiles(
                string rootPath, List<string> exts, IProgress<int> searchProgress, List<string> alreadyFound = null)
    {
        if (alreadyFound == null)
        {
            alreadyFound = new List<string>();
        }

        if (searchProgress != null)
        {
            counter++;
            searchProgress.Report(counter);
        }

        DirectoryInfo dI = new DirectoryInfo(rootPath);
        var dirs = dI.EnumerateDirectories().ToList();

        foreach (DirectoryInfo dir in dirs)
        {
            if (!((dir.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden))
            {
                alreadyFound = GetAllAccessibleFiles(dir.FullName, exts, searchProgress, alreadyFound);
            }
        }

        var files = Directory.GetFiles(rootPath);

        foreach (string file in files)
        {
            if (exts.Any(x => file.EndsWith(x)))
            {
                alreadyFound.Add(file);
            }
        }

        return alreadyFound;
    }

Answer 1

看来我离答案有点近了。我不知道为什么我没有想到。所以，这是我的RefreshButton_Tapped 的更新，以获取所有路径。

    private async void RefreshButton_Tapped(object sender, TappedRoutedEventArgs e)
    {
        StorageFolder sFolder = 
            await StorageFolder.GetFolderFromPathAsync((DataContext as MainPageVM).ParentFolder);

        List<string> fileTypeFilter = new List<string>();
        fileTypeFilter.Add(".pnsm");
        fileTypeFilter.Add(".pssm");

        QueryOptions queryOptions =
            new QueryOptions(CommonFileQuery.OrderByName, fileTypeFilter);

        StorageFileQueryResult results = sFolder.CreateFileQueryWithOptions(queryOptions);

        var files = await results.GetFilesAsync();

        List<string> paths = files.Select(x => x.Path.ToString()).ToList();

        SaveSearch();
    }

如果有人有更好的答案，请随时提出。