UWP 的 BroadFileSystemAccess 不起作用

我正在编写一个应用程序，它需要访问文本文件的权限，因为未经许可它会抛出异常“访问被拒绝”。 我添加到 Package.appxmanifest 特定行

xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities

"IgnorableNamespaces="uap mp rescap"

And

<rescap:Capability Name="broadFileSystemAccess" />

但还是不行。还有其他方法可以使用选择器访问特定文件吗？

是的，2018 年 4 月和 2018 年 10 月版本之间的行为发生了变化，默认值现在已禁用。这是隐私限制——我们非常注重维护用户的隐私。这方面的文档是最新的：https://learn.microsoft.com/en-us/windows/uwp/files/file-access-permissions#accessing-additional-locations。截至目前，如果您想检测该设置是启用还是禁用，您只需尝试访问某个文件/文件夹，如果启用，该设置将授予您权限，如果禁用，则拒绝权限（例如，“C:\ ”）。如果禁用，您可以在文件系统隐私页面上启动设置应用程序。例如：

protected override async void OnNavigatedTo(NavigationEventArgs e)
{
    try
    {
        StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(@"C:\");
        // do work
    }
    catch
    {
        MessageDialog dlg = new MessageDialog(
            "It seems you have not granted permission for this app to access the file system broadly. " +
            "Without this permission, the app will only be able to access a very limited set of filesystem locations. " +
            "You can grant this permission in the Settings app, if you wish. You can do this now or later. " +
            "If you change the setting while this app is running, it will terminate the app so that the " +
            "setting can be applied. Do you want to do this now?",
            "File system permissions");
        dlg.Commands.Add(new UICommand("Yes", new UICommandInvokedHandler(InitMessageDialogHandler), 0));
        dlg.Commands.Add(new UICommand("No", new UICommandInvokedHandler(InitMessageDialogHandler), 1));
        dlg.DefaultCommandIndex = 0;
        dlg.CancelCommandIndex = 1;
        await dlg.ShowAsync();
    }
}

private async void InitMessageDialogHandler(IUICommand command)
{
    if ((int)command.Id == 0)
    {
        await Launcher.LaunchUriAsync(new Uri("ms-settings:privacy-broadfilesystemaccess"));
    }
}