2016-10-11 39 views
0

我有2個表,Books和Attributes,它們通過與表Attribute_Book的多對多關係相互連接。我沒有設法執行創建功能,只想在詳細視圖中顯示來自第三個表的數據。我只是爲了檢查和解決問題,除了我想要顯示的值之外,還顯示了一個代理,它是屬性名稱(看到它帶有斷點).Project是db優先。謝謝你的幫助。Asp.net MVC,顯示來自db的數據(多對多)

這是我的書的ViewModel

public BookModel() 
    { 
     this.Attribute_Book = new HashSet<Attribute_Book>(); 
    } 

    public int BookID { get; set; } 

    public string Title { get; set; } 

    public int AuthorID { get; set; } 

    public int CountryID { get; set; } 

    public decimal Price { get; set; } 

    public string Description { get; set; } 

    public Nullable<int> PagesCount { get; set; } 

    public string Picture { get; set; } 

    public decimal TotalPrice { get; set; } 

    public virtual ICollection<Attribute_Book> Attribute_Book { get; set; } 
    public virtual Author Author { get; set; } 
    public virtual Country Country { get; set; } 

這是我的屬性模型

public Attribute() 
    { 
     this.Attribute_Book = new HashSet<Attribute_Book>(); 
    } 

    public int AttributeID { get; set; } 
    public string Name { get; set; } 
    public int AttTypeID { get; set; } 

    public virtual ICollection<Attribute_Book> Attribute_Book { get; set; } 
    public virtual Attribute_Type Attribute_Type { get; set; } 

這是我Attribute_Book模型

public int ID { get; set; } 
    public int BookID { get; set; } 
    public int AttributeID { get; set; } 
    public string ValueTypeText { get; set; } 
    public Nullable<System.DateTime> ValueTypeDate { get; set; } 

    public virtual Attribute Attribute { get; set; } 
    public virtual Book Book { get; set; } 

這是我的詳細動作在控制器

public async Task<ActionResult> Details(int? id) 
    { 
     if (id == null) 
     { 
      return new HttpStatusCodeResult(HttpStatusCode.BadRequest); 
     } 
     //Book book = await db.Books.Include(b=>b.Attribute_Book).FirstOrDefaultAsync(b=>b.BookID==id); 

     Book book = await db.Books.FindAsync(id); 

     BookModel model = GetBooks.Details(book); 

     if (book == null) 
     { 
      return HttpNotFound(); 
     } 
     return View(model); 
    } 

而且在這裏我想顯示的數據

<dd> 
     @Html.DisplayFor(model => model.Attribute_Book) 
     @{ 
      var extAtt = Model.Attribute_Book.FirstOrDefault(); 
      if (extAtt != null) 
      { 
       @extAtt.ValueTypeText 
      } 
     } 
    </dd> 

詳細信息查看在使用我的視圖模型,我想也許這會有所幫助,但仍不能認爲Details.cshtml的一部分,我的功能從哪裏獲得詳細信息對於視圖模型

public static BookModel Details(Book item) 
    { 
     var model = new BookModel 
     { 
      BookID = item.BookID, 
      Title = item.Title, 
      PagesCount = Convert.ToInt32(item.PagesCount), 
      Description = item.Description, 
      Price = item.Price, 
      CountryID = item.CountryID, 
      AuthorID = item.AuthorID, 
      Author = item.Author, 
      Country = item.Country, 
      Picture = item.Picture, 
      TotalPrice = item.Country.TelCode + item.Price, 
      Attribute_Book = item.Attribute_Book.ToList() 
     }; 
     return model; 
    } 

這是什麼它顯示我

System.Data.Entity.DynamicProxies.Attribute_E4A8D634F0CCC98D73ED369A80817849BFA813311536941614A7242B3A2751A2 456

過去的3號是我想))

+0

如果你沒有指定關係的任何配置,實體框架爲你的關係生成代理 – Zinov

+0

對不起,但我想知道,如果我有所有的外鍵,所有這些只是scafolding的結果,我必須添加什麼和項目在哪裏正常工作? – Hovo

+0

https://msdn.microsoft.com/en-us/data/jj592886.aspx也看到這個參考http://stackoverflow.com/questions/7111109/should-i-enable-or-disable-dynamic-proxies -with實體框架-4-1-和MVC3。如果這幫助你讓我知道把它作爲一個答案 – Zinov

回答

0

所有問題是鑑於值。剛剛刪除了這部分@Html.DisplayFor(model => model.Attribute_Book),它的工作原理,我想displayfor是第一個值的主鍵id後,是屬性ID,並試圖顯示它。