ASP.net MVC表關係

我是ASP.net MVC的新手，這是我的第一次嘗試。我使用關係表設計一個小型站點。（保持它短，我刪除了一些不相關的領域）ASP.net MVC表關係

Items：

Id int (PK)
description nvarchar(50)
divisionid nchar(2) FK
categoryid nchar(6) FK

Division

code nchar(2) PK
description nvarchar(50)

Category

code nchar(6) PK
description nvarchar(50)

我相信是相當自我解釋。試圖創建下面的型號爲它的時候：

public class Item 
{ 
    [Key] 
    [Display(Name="Id")] 
    public int Id { get; set; } 

    [Required(ErrorMessage="Description is required")] 
    [Display(Name = "Description")] 
    [StringLength(50, ErrorMessage = "Description must not be more than 50 characters long")] 
    public string Description { get; set; } 

    [Display(Name = "Division")] 
    [StringLength(2)] 
    public string DivisionId { get; set; }   

    [Display(Name = "Category")] 
    [StringLength(6)]   

    [ForeignKey("DivisionId")] 
    public virtual Division division { get; set; } 
    [ForeignKey("CategoryId")] 
    public virtual Category Category { get; set; } 

} 

public class Division 
{ 
    [Key] 
    [Display(Name = "Code")] 
    [StringLength(2, ErrorMessage = "Code must be 2 char.")] 
    public string Code { get; set; } 

    [Display(Name = "Description")] 
    [Required(ErrorMessage = "Description is required")] 
    [StringLength(50,ErrorMessage="Description must not be more than 50 characters long")] 
    public string Description { get; set; } 

    public virtual ICollection<Item> Items { get; set; } 
} 

public class Category 
{ 
    [Key] 
    [Display(Name = "Code")] 
    [StringLength(6, ErrorMessage = "Code must be 6 char.")] 
    public string Code { get; set; } 

    [Display(Name = "Description")] 
    [Required(ErrorMessage = "Description is required")] 
    [StringLength(50, ErrorMessage = "Description must not be more than 50 characters long")] 
    public string Description { get; set; } 

    public virtual ICollection<Item> Items { get; set; } 
}

問題正在運行的網站的時候，我得到的異常無效的對象名稱dbo.Divisions 與控制器的返回值指向一個錯誤

Line 20:   { 
    Line 21:    var items = db.Items.Include(i => i.division).Include(i => i.Category); 
    Line 22:    return View(items.ToList()); 
    Line 23:   }

任何幫助非常感謝！

來源

2013-10-01 user2831565