C# 信息没有出现

我已经创建了数据库和所有的编码。但这些信息现在出现在手机上。 我怎样才能让他们出现？ 它不能告诉我任何细节。它告诉我，它无法通过编码this.listBox.ItemsSource=CarScores转到此行

//Main Page Coding .xaml.CS
 namespace carDatabaseCreater
{
 public partial class MainPage : PhoneApplicationPage
 {

    public static List<Car> CarScoresList = new List<Car>();
    Uri uri;
    Grid CarGrid;
    CarHisrotyRepository CarHisrotyRepository;
    ObservableCollection<Car> CarScores;


    // Constructor
    public MainPage()
    {
        InitializeComponent();


        this.DisplayCarHistory();
        this.UpdateCarScoresFromDB();
    }


      public void SaveCarToCarHistory(Car _Car)
      {
           CarHisrotyRepository _CarHisrotyRepository = new CarHisrotyRepository();

         Car item0 = new Car() { CarName = "Arion", CarSupplierName = "Bahowan", CarImage = "Image/BMW.jpg", CarCompanyName = "Toyota" };
         Car item1 = new Car() { CarName = "Arion", CarSupplierName = "Bahowan", CarImage = "Image/BMW.jpg", CarCompanyName = "Toyota" };
         Car item2 = new Car() { CarName = "Arion", CarSupplierName = "Bahowan", CarImage = "Image/BMW.jpg", CarCompanyName = "Toyota" };
         Car item3 = new Car() { CarName = "Arion", CarSupplierName = "Bahowan", CarImage = "Image/BMW.jpg", CarCompanyName = "Toyota" };
         Car item4 = new Car() { CarName = "Arion", CarSupplierName = "Bahowan", CarImage = "Image/BMW.jpg", CarCompanyName = "Toyota" };
         CarScoresList.Add(item0);
         _CarHisrotyRepository.Save(item0);
        CarScoresList.Add(item1);
         _CarHisrotyRepository.Save(item1);
         CarScoresList.Add(item2);
         _CarHisrotyRepository.Save(item2);
         CarScoresList.Add(item3);
         _CarHisrotyRepository.Save(item3);
         CarScoresList.Add(item4);
         _CarHisrotyRepository.Save(item4);


     }

     private void UpdateCarScoresFromDB()
     {
         CarHisrotyRepository CarHisrotyRepository = new carDatabaseCreater.CarHisrotyRepository();

         List<Car> AllGames = CarHisrotyRepository.allQuery(CarHisrotyRepository.CarContext).ToList();


         }


     public void DisplayCarHistory()
     {
         this.CarHisrotyRepository = new CarHisrotyRepository();

         // Get Game History from IsoStore
         List<Car> CarHistory = this.CarHisrotyRepository.Load();

         // Display to Screen
        CarScores = new ObservableCollection<Car>(CarHistory);
        this.listBox.ItemsSource = CarScores;// the Error appears here
      }

    }
   }

---

我看不到任何代码行，你把汽车网格到视觉树。也许这就是原因

这里的代码太多了。请把它简化为一个简短但完整的程序，只包含相关代码-一个真实应用程序的简化版本，换句话说，它仍然说明了问题。我无法发布错误的快照照片。我不知道你的意思。你的问题仍然包含大量的空白、注释掉的方法和大量的项目，而假设只有两个就足够了，并且错误出现在这里，甚至没有对错误是什么的描述。我的程序无法通过它并显示我的结果。无法识别它无法通过它不是错误的技术描述。这相当于告诉你的医生你身体不太好。对不起，没有更多的描述，没有人能帮助你////////////////////////////////