Windows phone 8.1 从windows phone 8.1中的FolderPicker获取文件夹

我已尝试使用此代码在Windows Phone上获取文件夹

    FolderPicker folderPicker = new FolderPicker();
    folderPicker.SuggestedStartLocation = PickerLocationId.Downloads;
    StorageFolder folder = await folderPicker.PickSingleFolderAsync();

    if (folder != null)
    {
        string Token = Windows.Storage.AccessCache.StorageApplicationPermissions.MostRecentlyUsedList.Add(folder, folder.Name);

    }

但是Windows Phone 8.1不支持

PickSingleFolderAsync

，并且

PickFolderAndContinue

是一个无效函数

如何将文件夹添加到StorageApplicationPermissions.MostRecentlyUsedList？

根据，您会注意到可以通过PickFolder和Continue回调方法（ContinueFolderPicker）检索文件夹

以下是示例中的代码片段：

public void ContinueFolderPicker(FolderPickerContinuationEventArgs args) 
    { 
        StorageFolder folder = args.Folder; 
        if (folder != null) 
        { 
            // Application now has read/write access to all contents in the picked folder (including other sub-folder contents) 
            StorageApplicationPermissions.FutureAccessList.AddOrReplace("PickedFolderToken", folder); 
            OutputTextBlock.Text = "Picked folder: " + folder.Name; 
        } 
        else 
        { 
            OutputTextBlock.Text = "Operation cancelled."; 
        } 
    } 

希望这有帮助