C# Windows Phone 8.1智能卡应用程序后台任务崩溃

我有一个问题，我正试图解决一个多星期了，我只是不能解决它。 我正在尝试用nfc和智能卡制作一个非常简单的Windows Phone 8.1应用程序。 后来我尝试使用SmartCardEmulator类提供的智能卡仿真，但现在我只想有一个后台任务，在接近nfc标记/智能卡时执行这些操作。 对于这个问题，我做了一个完整的新项目，其中只包含基本内容。 当我按下按钮时，程序不断崩溃

开始时，我制作了一个空白的Windows Phone应用程序项目和一个Windows运行时组件，并将其添加到解决方案中。手机应用程序项目引用了Windows运行时组件项目

在MainPage.xaml中，我只放了一个按钮和一个文本框

类BackgroundTaskManager位于windows phone应用程序项目中，类TaskOne位于运行时组件项目中

在Package.appxmanifest文件中，我在声明中添加了后台任务，BackgroundTasks.TaskOne作为入口点，系统事件作为支持任务类型

在需求中，我启用了NFC

按下按钮时出现的错误如下：

A first chance exception of type 'System.ArgumentException' occurred in mscorlib.ni.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.ni.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in SimpleNfcApp.exe
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll

我尝试调试并将断点放在BackgroundTaskManager.cs中RegisterBackgroundTask方法的开头，然后在MainPage.xaml.cs中的doSomething结束时崩溃

以下是代码：

MainPage.xaml.cs

BackgroundTaskManager.cs

有人知道我做错了什么吗？ 谢谢你的阅读。 格里兹，斯基皮

编辑：

我在MainPage.xaml.cs中的doSomething方法周围添加了一个try-catch块，并得到了一条新的更明显的错误消息

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll
System.UnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
   at Windows.ApplicationModel.Background.BackgroundTaskBuilder.Register()
   at SimpleNfcApp.BackgroundTaskManager.<RegisterBackgroundTask>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at SimpleNfcApp.MainPage.<startTask>d__0.MoveNext() Second exception caught.

你有错误代码吗

var settings = ApplicationData.Current.LocalSettings;
settings.Values.Remove(taskName);

ApplicationData.Current.LocalSettings-对此文件的访问被拒绝

namespace BackgroundTasks
{
    public sealed class TaskOne
    {
        IBackgroundTaskInstance _taskInstance;
        BackgroundTaskDeferral _deferral;

        public async void Run(IBackgroundTaskInstance taskInstance)
        {
            _taskInstance = taskInstance;
            _deferral = taskInstance.GetDeferral();

            int x;
            x = 2 + 2;

            _deferral.Complete();
        }


    }
}

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll
System.UnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
   at Windows.ApplicationModel.Background.BackgroundTaskBuilder.Register()
   at SimpleNfcApp.BackgroundTaskManager.<RegisterBackgroundTask>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at SimpleNfcApp.MainPage.<startTask>d__0.MoveNext() Second exception caught.

//var trigger = new SmartCardTrigger(SmartCardTriggerType.EmulatorNearFieldEntry);
var trigger = new SystemTrigger(SystemTriggerType.ServicingComplete, false);

var settings = ApplicationData.Current.LocalSettings;
settings.Values.Remove(taskName);