如何訪問列表對象的ASP.Net Web服務

Question

我在ASP.Net和MVC5編程是新的，其實我有一個問題，我有這班「學生」：

namespace Project.Entities.Models 
{ 
    public partial class Student : BaseEntity 
    { 
     public string FirstName { get; set; } 
     public string LastName { get; set; } 

     [ForeignKey("ClassId")] 
     public virtual Class Class { get; set; } 
     public Int64 ClassId { get; set; } 

     [ForeignKey("ImageId")] 
     public virtual Image Image { get; set; } 
     public Int64 ImageId { get; set; } 

     public virtual List<Mark> Marks { get; set; } 
     public virtual List<Punishment> Punishments { get; set; } 


     public Student() 
     { 
      Marks = new List<Mark>(); 
      Punishments = new List<Punishment>(); 
     } 
    } 

類「馬克」：

namespace SMA.Entities.Models 
{ 
    public partial class Mark : BaseEntity 
    { 
     public int Score { get; set; } 
     public string Note { get; set; } 

     [ForeignKey("StudentId")] 
     public virtual Student Student { get; set; } 
     public Int64 StudentId { get; set; } 

    } 
} 

我想每個學生的標誌，但我不知道怎麼回事， 這是我在JSON結果得到：

[ 
{ 
FirstName: "Student ", 
LastName: "1", 
Class: null, 
ClassId: 1, 
Image: null, 
ImageId: 1, 
Marks: [ ], 
Punishments: [ ], 
Id: 1, 
ObjectState: 0 
}, 
{ 
FirstName: "Student ", 
LastName: "2", 
Class: null, 
ClassId: 2, 
Image: null, 
ImageId: 2, 
Marks: [ ], 
Punishments: [ ], 
Id: 2, 
ObjectState: 0 
} 
] 

所以請你有任何想法，我怎麼能訪問每個學生的標記數據 感謝幫助

Answer 1

假設你有一個在你的學生實體是主鍵的Id字段（你沒有顯示它的問題，但我相信它省略），嘗試改變這一點：

public virtual List<Mark> Marks { get; set; } 
public virtual List<Punishment> Punishments { get; set; } 

到

public virtual ICollection<Mark> Marks { get; set; } 
public virtual ICollection<Punishment> Punishments { get; set; }