ASP.NET MVC - 從其他表

Question

沒有得到這些數據是我的課：在我的倉庫

public class HotelRoomRatingView 
    { 
     public int HotelID { get; set; } 
     public roomKinds RoomKinds { get; set; } 
     public HotelReview HotelReview { get; set; } 

     public HotelRoomRatingView() 
     { 
     } 
     public HotelRoomRatingView(int hotelId, roomKinds rooms, HotelReview review) 
     { 
      this.HotelID = hotelId; 
      this.RoomKinds = rooms; 
      this.HotelReview = review; 
     } 
    } 

public class HotelReview 
{ 
    public int HotelReviewID { get; set; } 

    public double Rating { get; set; } 

    public List<Review> Reviews { get; set; } 

    public HotelReview() 
    { 
     this.Reviews = new List<Review>(); 
    } 
} 

public partial class roomKinds : object, System.ComponentModel.INotifyPropertyChanged 
{ 
    [Key] 
    public int roomKindsId { get; set; } 

    private ObservableCollection<objectKind> objectKindField; 

    public roomKinds() 
    { 

    } 
    public roomKinds(Class.roomKinds origin) 
    { 
     this.objectKindField = origin.objectKind; 
    } 

    [System.Xml.Serialization.XmlElementAttribute(Order = 0)] 
    public ObservableCollection<objectKind> objectKind 
    { 
     get 
     { 
      return this.objectKindField; 
     } 
     set 
     { 
      this.objectKindField = value; 
      this.RaisePropertyChanged("objectKind"); 
     } 
    } 

    public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged; 

    protected void RaisePropertyChanged(string propertyName) 
    { 
     System.ComponentModel.PropertyChangedEventHandler propertyChanged = this.PropertyChanged; 
     if ((propertyChanged != null)) 
     { 
      propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName)); 
     } 
    } 
} 
public partial class Hotel : object, System.ComponentModel.INotifyPropertyChanged 
    { 
     [Key] 
     public int HotelId { get; set; } 
     private int hotIdField; 
     // many others properties 
     [System.Xml.Serialization.XmlElementAttribute(Order = 105)] 
     public HotelReview hotelReview 
     { 
      get; 
      set; 
     } 

     [System.Xml.Serialization.XmlElementAttribute(Order = 104)] 
     public roomKinds rooms 
     { 
      get; 
      set; 
     } 

     [System.Xml.Serialization.XmlElementAttribute(Order = 0)] 
     public int hotId 
     { 
      get 
      { 
       return this.hotIdField; 
      } 
      set 
      { 
       this.hotIdField = value; 
       this.RaisePropertyChanged("hotId"); 
      } 
     } 
    } 

Get方法是這樣的：

public Models.Hotel Get(int id) 
     { 
      return db.hotels.SingleOrDefault(h => h.hotId == id); 
     } 

HotelId和hotId都還好，我需要它這條路。所以我從LINQ獲取數據庫中的酒店，我得到酒店，但我沒有從其他表中獲取數據。我沒有得到HotelReview和RoomKinds。我在這些屬性中得到了空值，但在數據庫中它們與Hotel通過ID連接。 感謝您的幫助

Answer 1

您將需要使用.Include明確加載這些：

return db.hotels.Include(hr => hr.HotelReview) 
       .Include(rk => rk.RoomKinds) 
       .SingleOrDefault(h => h.hotId == id); 

UPDATE

假設你的實體正確鏈接，你應該能夠只是繼續向下包括：

return db.hotels.Include(hr => hr.HotelReview) 
       .Include(r => r.HotelReview.Reviews) 
       .Include(rk => rk.RoomKinds) 
       .SingleOrDefault(h => h.hotId == id);