代碼第一種方法不創建外鍵

Question

我想使用實體框架代碼第一種方法創建1-n關係。以下是我的課

public class User 
{ 

    [Key] 
    public int UserID { get; set; } 


    //public virtual Vote Vote { get; set; } 
    [Required] 
    public string Name { get; set; } 
    [Required] 
    public string Email { get; set; } 
    [Required] 
    public string Bio { get; set; } 
    [Required] 
    public string Education { get; set; } 
    [Required] 
    public string Experience { get; set; } 

    public string Password { get; set; } 

} 

和下面是我的第二類

public class Vote 
{ 
    [Required] 
    [Key] 
    public int VoteID { get; set; } 

    [ForeignKey("UserID")] 
    [Required] 
    public virtual User User { get; set; } 

    //public virtual int UserID { get; set; } 

    [Required] 
    public int VoteCount { get; set; } 
    [Required] 

    public int UserID { get; set; } 


} 

用戶和票和1 n的關係，在我的情況下，我的意思是，用戶名應在投票表的外鍵。但是，當我完成創建分貝以下命令

enable-migrations -ContextTypeName ProfileOne.PO -Force 

    Add-migration PO 

    update-database 

我沒有得到任何外鍵或列名UserID

任何幫助可以理解爲什麼我不能達到的效果。

Answer 1

嘗試使用以下方法：

public class User 
{ 
    [Key] 
    public int UserID { get; set; } 

    [Required] 
    public string Name { get; set; } 

    [Required] 
    public string Email { get; set; } 

    [Required] 
    public string Bio { get; set; } 

    [Required] 
    public string Education { get; set; } 

    [Required] 
    public string Experience { get; set; } 

    public string Password { get; set; }   


    //Navigation properties 
    public virtual ICollection<Vote> Votes { get; set; } 
} 


public class Vote 
{ 
    [Key] 
    public int VoteID { get; set; } 

    [Required] 
    public int VoteCount { get; set; } 


    //Foreign key for User 
    [Required] 
    public int UserID { get; set; } 

    //Navigation properties 
    public virtual User User { get; set; } 
} 

欲瞭解更多信息，看看Entity Relationships。希望這有助於...

Answer 2

修改你的類的樣子：

public class User 
{ 
    [Key] 
    public int UserID { get; set; } 

    [Required] 
    public string Name { get; set; } 

    [Required] 
    public string Email { get; set; } 

    [Required] 
    public string Bio { get; set; } 

    [Required] 
    public string Education { get; set; } 

    [Required] 
    public string Experience { get; set; } 

    public string Password { get; set; } 

    public virtual Vote Vote { get; set; } 
} 

public class Vote 
{ 
    [Required] 
    [Key] 
    public int VoteID { get; set; } 

    [Required] 
    public int VoteCount { get; set; } 

    [Required] 
    public int UserID { get; set; } 

    //[ForeignKey("UserID")] 
    //[Required] 
    public virtual User User { get; set; } 
} 

2個實體之間的關係由虛擬財產，其中U評論他們定義。