實體沒有爲其關係公開外鍵屬性的錯誤

Question

我花了一些時間來構建我的領域模型（使用EF CTP5代碼優先），現在我想我會通過一些測試數據，看看是否一切作品。不幸的是，似乎我的應用程序加載了一些錯誤，除了在運行時期之外，它們不會被捕獲，因爲一切都完美無缺。無論如何，我不斷收到以下錯誤：

An error occurred while saving entities that do not expose foreign key properties for their relationships.

，這裏是內部異常：

"The INSERT statement conflicted with the FOREIGN KEY constraint \"Item_ItemStatus\". The conflict occurred in database \"CFSharwe\", table \"dbo.ItemStatus\", column 'Id'.\r\nThe statement has been terminated."

我不知道爲什麼會這樣。我懷疑這可能是由我的initializer類導致的，我在其中加載了Seed（）方法內的所有數據庫靜態內容。所以我評論了我添加ItemStatuses的部分，而且我仍然遇到同樣的錯誤。此外，我應該在編譯時得到這個，而不是在運行時，不是？

下面是ItemStatus類和部分我的測試數據：

public class ItemStatus 
{ 
public int Id { get; set; } 
public string Description { get; set; } 
public ICollection<Item> Items { get; set; } 
} 

//Test data inside the Index() method of the ItemsController 
var item2 = new Item 
    { 
    Title = "iPhone 4", 
    Description = "Lorem Ipsum is simply", 
    StartingPrice = 400f, 
    User = user2, 
    Status = 1, 
    EndDate = DateTime.Now.AddDays(10), 
    StartDate = DateTime.Now, 
    BidIncrement = 3f, 
    Bids = new List<Bid>(), 
    Comments = new List<Comment>(), 
    //ItemStatus = _itemsService.GetItemStatusById(1),  
    ViewingUsers = new List<User>(), 
    WatchingUsers = new List<User>(), 
    Tags = new List<Tag>() 
    }; 
    //here's where I save the data to the database 
    var category = _categoryService.GetChildByName(categoryName); 
    category.Items.Add(item2); 
    _categoryService.Save(); 

UPDATE：（由Slauma請求）

public class Item 
{ 
    public int Id { get; set; } 
    public string Title { get; set; } 
    public string Description { get; set; } 
    public float StartingPrice { get; set; } 
    public float? BidIncrement { get; set; } 
    public DateTime StartDate { get; set; } 
    public DateTime EndDate { get; set; } 
    public int Status { get; set; } 
    [ForeignKey("Status")] 
    public virtual ItemStatus ItemStatus { get; set; } 
    public virtual Address PickupAddress { get; set; } 
    public virtual User User { get; set; } 
    public virtual ChildCategory Category { get; set; } 
    public virtual ICollection<Comment> Comments { get; set; } 
    public virtual ICollection<Image> Images { get; set; } 
    public virtual ICollection<Bid> Bids { get; set; } 
    public virtual ICollection<User> WatchingUsers { get; set; } 
    public virtual ICollection<User> ViewingUsers { get; set; } 
    public virtual ICollection<Tag> Tags { get; set; } 
    //public virtual ItemRating Rating { get; set; } 

    public bool IsValidBidAmount(int amount) 
    { 
     if (amount <= this.Bids.Max(a => a.Amount)) 
      return false; 

     return true; 
    } 

    public bool IsClosed() 
    { 
     if (this.ItemStatus.Id.Equals(3)) 
      return true; 
     return false; 
    } 

    public bool IsPending() 
    { 
     if (ItemStatus.Id.Equals(2)) 
      return true; 
     return false; 
    } 

    public bool IsPublished() 
    { 
     if (ItemStatus.Equals(1)) 
      return true; 
     return false; 
    } 

    public int WinnerId() 
    { 
     if(IsClosed()) 
     { 
      User highestBidder = null; 
      foreach (Bid b in Bids) 
      { 
       if (b.Amount.Equals(HighestBid())) 
        highestBidder = b.User; 
      } 
      if (highestBidder != null) return highestBidder.Id; 
     } 
     return 0; 
    } 

    public float HighestBid() 
    { 
     return Bids.Max(u => u.Amount); 
    } 

    public string MainImageLink() 
    { 
     var mainImage = Images.Single(i => i.Rank.Equals(0)); 
     return mainImage.Path; 
    } 

    public string FirstTag() 
    { 
     return Tags.First().Title; 
    } 
} 

更新2：

public class UnitOfWork : IUnitOfWork 
{ 
    private readonly IDatabaseFactory _databaseFactory; 
    private DbContext _context; 
    public UnitOfWork(IDatabaseFactory dbFactory) 
    { 
     _databaseFactory = dbFactory; 
    } 

    protected DbContext DataContext 
    { 
     get 
     { 
      return _context ?? (_context = _databaseFactory.GetDbContext()); 
     } 
    } 

    public void Commit() 
    { 
     DataContext.SaveChanges(); 
    } 
} 

public class EfDatabaseFactory : IDisposable, IDatabaseFactory 
{ 
    private SharweEntities _dbContext; 


    public DbContext GetDbContext() 
    { 
     return _dbContext ?? (_dbContext = new SharweEntities()); 
    } 

    public System.Data.Objects.ObjectContext GetObjectContext() 
    { 
     return _dbContext.ObjectContext; 
    } 

    public void Dispose() 
    { 
     if (_dbContext != null) 
      _dbContext.Dispose(); 
    } 
} 

關於th的任何想法問題？提前致謝。

Answer 1

我認爲錯誤表示您的數據庫中沒有Id = 1的ItemStatus記錄。