實體框架類問題中的兩個相同類類型

Question

我正在實現允許用戶彼此關注的功能。 我有數據庫表：

User{UserId, FirstName, LastName etc.} 
Followings{FollowerUserId, FollowingUserId, CreatedOnDate etc.} 

所以我加入EF類：

public class Follow 
    { 
     [Key, Column(Order = 1)] 
     public Guid FollowerUserId { get; set; } 
     [Key, Column(Order = 2)] 
     public Guid FollowUserId { get; set; }   
     public DateTime CreatedOnDate { get; set; } 

     public virtual User Follower { get; set; } 
     public virtual User Following { get; set; } 
    } 

最後兩個虛擬財產職高問題。 當我打電話：

var model = con.Follows.Where(x => x.FollowerUserId == uid); 

我得到以下異常：

Invalid column name 'Following_UserId'. 

的問題可能是一類造成的，因爲兩個用戶對象。任何想法如何解決這個問題？
UPDATE

public class User 
    { 

     public Guid UserId { get; set; } 
     ... 
     public virtual ICollection<Follow> Following { get; set; } 
     public virtual ICollection<Follow> Followers { get; set; } 
    } 

Answer 1

我想原因是，外鍵屬性（FollowerUserId和FollowUserId）和導航性能（Follower和Following）不尊重的命名規則，使EF是無法識別第一個屬性作爲外鍵。您可以通過指定顯式使用[ForeignKey]屬性FK性能解決該問題：

public class Follow 
{ 
    [Key, Column(Order = 1), ForeignKey("Follower")] 
    public Guid FollowerUserId { get; set; } 
    [Key, Column(Order = 2), ForeignKey("Following")] 
    public Guid FollowUserId { get; set; }   

    public DateTime CreatedOnDate { get; set; } 

    public virtual User Follower { get; set; } 
    public virtual User Following { get; set; } 
} 

編輯

最小的第二個屬性不尊重的命名慣例，第一個看起來不錯。所以，或者你也可以重新命名第二FK財產FollowUserId到解決這個問題：

public Guid FollowingUserId { get; set; }   

...因爲導航屬性被稱爲Following。

編輯2

關於你的更新：您需要添加[InverseProperty]屬性告訴EF其導航性能屬於一起：

public class Follow 
{ 
    [Key, Column(Order = 1), ForeignKey("Follower")] 
    public Guid FollowerUserId { get; set; } 
    [Key, Column(Order = 2), ForeignKey("Following")] 
    public Guid FollowUserId { get; set; }   

    public DateTime CreatedOnDate { get; set; } 

    [InverseProperty("Followers")] // refers to Followers in class User 
    public virtual User Follower { get; set; } 
    [InverseProperty("Following")] // refers to Following in class User 
    public virtual User Following { get; set; } 
}