C# 使用后台任务UWP启动备份文件夹

我必须使用后台任务启动文件夹备份，以便使用组件Windows运行时的implementTazione，但在组件Windows运行时中，不可能使用公共静态异步任务方法

MainPage.xaml.cs：

    public MainPage()
    {
        this.InitializeComponent();
    }

    private async void BtnChooseFolder_Click(object sender, RoutedEventArgs e)
    {
        FolderPicker folderPicker = new FolderPicker();
        folderPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        folderPicker.FileTypeFilter.Add("*");
        StorageFolder SelectFolderToLoad = await folderPicker.PickSingleFolderAsync();
        StorageApplicationPermissions.FutureAccessList.AddOrReplace("FolderToCopy", SelectFolderToLoad);
    }

    private async void BtnDestinationFolder_Click(object sender, RoutedEventArgs e)
    {
        FolderPicker folderPicker = new FolderPicker();
        folderPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        folderPicker.FileTypeFilter.Add("*");
        StorageFolder SelectFolderToLoad = await folderPicker.PickSingleFolderAsync();
        StorageApplicationPermissions.FutureAccessList.AddOrReplace("DestinationFolder", SelectFolderToLoad);
    }

    private void BtnTask_Click(object sender, RoutedEventArgs e)
    {
        foreach (var cur in BackgroundTaskRegistration.AllTasks)
        {
            if (cur.Value.Name == "TaskLocalBackup")
            {
                cur.Value.Unregister(true);
            }
        }

        var requestTask = BackgroundExecutionManager.RequestAccessAsync();

        var builder = new BackgroundTaskBuilder();

        builder.Name = "TaskLocalBackup";
        builder.TaskEntryPoint = "ClassBackgraundTask.BackgroundTaskClass";
        //builder.SetTrigger(new SystemTrigger(SystemTriggerType.UserPresent, false));

        builder.SetTrigger(new TimeTrigger(15, false));

        BackgroundTaskRegistration task = builder.Register();
    }

BackgroundTaskClass.cs：（在组件Windows运行时中）

这就是错误：

方法“ClassBackgraundTask.BackgroundTaskClass.CopyFolderAsync（Windows.Storage.StorageFolder，Windows.Storage.StorageFolder）”的签名中的参数类型为“System.Threading.Tasks.Task”。尽管此类型不是有效的Windows运行时类型，但它实现的接口是有效的Windows运行时类型。考虑更改方法签名以使用下列类型之一：“Stask.IDISPOSTABLE”。ClassBackgraundTask

如何解决?

---

提前感谢。

您不应该自己编写bacakup程序。有很多备份程序。见鬼，在Windows上，我可以用Robocopy来做。事实上，我经常使用Robocopy进行备份。这些最简单的解决方案是将

CopyFolderAsync

private

，但您需要对

任务实例使用延迟。
    public sealed class BackgroundTaskClass : IBackgroundTask
    {
        public void Run(IBackgroundTaskInstance taskInstance)
        {
            StartBackup();
        }
        private async static void StartBackup()
        {
            StorageFolder folderToSave = await 
                  StorageApplicationPermissions.FutureAccessList.GetFolderAsync("FolderToCopy");
            StorageFolder foldersSaved = await        
                 StorageApplicationPermissions.FutureAccessList.GetFolderAsync("DestinationFolder");
            await CopyFolderAsync(folderToSave, foldersSaved);
        }

        public static async Task CopyFolderAsync(StorageFolder source, StorageFolder destinationContainer)
        {
            StorageFolder destinationFolder = null;
            destinationFolder = await destinationContainer.CreateFolderAsync("Local" ?? source.Name, 
                                CreationCollisionOption.ReplaceExisting);

            foreach (var file in await source.GetFilesAsync())
            {
                await file.CopyAsync(destinationFolder, file.Name, 
                      NameCollisionOption.ReplaceExisting);
            }
            foreach (var folder in await source.GetFoldersAsync())
            {
                 await CopyFolderAsync(folder, destinationFolder);
            }
        }
    }