10的Windows通用应用程序文件/目录访问 [英] Windows 10 Universal App File/Directory Access

问题描述

I'm开发一个应用程序，从文件系统上的一个可配置的位置读取JPEG和PDF文件。
目前，在WPF实现，现在我正尝试移动到新的Windows应用程序的通用正在运行的版本。

I´m developing an app that is reading jpeg and pdf files from a configurable location on the filesystem. Currently there is a running version implemented in WPF and now I´m trying to move to the new Windows Universal apps.

以下code正常工作与WPF：

The following code works fine with WPF:

public IList<string> GetFilesByNumber(string path, string number)
    {
        if (string.IsNullOrWhiteSpace(path))
            throw new ArgumentNullException(nameof(path));

        if (string.IsNullOrWhiteSpace(number))
            throw new ArgumentNullException(nameof(number));

        if (!Directory.Exists(path))
            throw new DirectoryNotFoundException(path);

        var files = Directory.GetFiles(path, "*" + number + "*",
           SearchOption.AllDirectories);

        if (files == null || files.Length == 0)
            return null;
        return files;
    }

通过使用通用应用程序我碰到了一些问题：

With using Universal Apps I ran into some problems:

• Directory.Exists 不可用


• 如何从目录中我的应用程序存储的外部读取？

要在应用程序存储外的其他目录下读取我试过如下：

To read from an other directory outside the app storage I tried the following:

StorageFolder folder = StorageFolder.GetFolderFromPathAsync("D:\\texts\\");
var fileTypeFilter = new string[] { ".pdf", ".jpg" };
QueryOptions queryOptions = new QueryOptions(CommonFileQuery.OrderBySearchRank, fileTypeFilter);
queryOptions.UserSearchFilter = "142";
StorageFileQueryResult queryResult = folder.CreateFileQueryWithOptions(queryOptions);
IReadOnlyList<StorageFile> files = queryResult.GetFilesAsync().GetResults();

问题是：它isn't工作，但我得到一个异常：

The thing is: It isn´t working, but I get an exception:

型System.UnauthorizedAccessException的的异常出现在TextManager.Universal.DataAccess.dll但在用户code没有处理
      其他信息：访问被拒绝。 （从HRESULT异常：0X80070005（E_ACCESSDENIED））

An exception of type 'System.UnauthorizedAccessException' occurred in TextManager.Universal.DataAccess.dll but was not handled in user code Additional information: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))

我知道，你必须在清单中配置一些权限，但我不能找到文件系统的IO操作的一个合适的...

I know that you have to configure some permissions in the manifest, but I can´t find one suitable for filesystem IO operations...

是不是有人也有这样的问题/一个可能的解决方案？

Did someone also have such problems/a possible solution?

解决方案：
从@Rico苏特给我的解决方案，我与FolderPicker组合chosed的FutureAccessList。另外，也可以与令牌以访问条目重新启动该程序后

Solution: From the solutions that @Rico Suter gave me, I chosed the FutureAccessList in combination with the FolderPicker. It is also possible to access the entry with the Token after the program was restarted.

我也可以推荐你 UX Guidlines 这<一个href=\"https://github.com/Microsoft/Windows-universal-samples/blob/master/Samples/FileSearch/cs/Scenario1.xaml.cs\">Github样品。

非常感谢你！

推荐答案

在UWP的应用程序，你只能访问下列文件和文件夹：

In UWP apps, you can only access the following files and folders:

• 这是在清单文件目录（例如，文档，图片，影片文件夹）

其中用户手动与 FileOpenPicker 或的目录和文件： //msdn.microsoft.com/library/windows/apps/br207881\">FolderPicker

• 文件从<一个href=\"https://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.accesscache.storageapplicationpermissions.aspx\">FutureAccessList或MostRecentlyUsedList


• 文件，这些文件与文件扩展名关联，或通过共享
打开

• Directories which are declared in the manifest file (e.g. Documents, Pictures, Videos folder)
• Directories and files which the user manually selected with the FileOpenPicker or FolderPicker
• Files from the FutureAccessList or MostRecentlyUsedList
• Files which are opened with a file extension association or via sharing

如果您需要访问所有文件 D：\\ ，用户必须手动挑选 D：\\ 开车使用FolderPicker，那么你获得的一切在此驱动器...

If you need access to all files in D:\, the user must manually pick the D:\ drive using the FolderPicker, then you have access to everything in this drive...

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