實體框架一對一關係

Question

我正在使用實體框架6代碼的應用程序中使用以下模型。

public class Customer 
{ 
    public Customer 
    { 

    } 

    public int Id { get; set; } 
    public string Name { get; set; } 

    public virtual Address Address { get; set; } 
} 


public class Address 
{ 
    public Address 
    { 

    } 

    public int Id { get; set; } 
    public string Street { get; set; } 
    public int Number { get; set; } 
    public int Country { get; set; } 

    public virtual Customer Customer { get; set; }    
} 

當我試圖挽救他們，我得到以下錯誤：

Unable to determine the principal end of an association between the types Customer and Address

Answer 1

您需要speicify的外鍵關係。如here所述，嘗試在public virtual Customer Customer { get; set; }和 [ForeignKey("AddressId")]之上添加[ForeignKey("CustomerId")]而不是public virtual Address Address { get; set; }，並將這些id字段添加到模型中。如：

public class Customer 
{ 
    public Customer 
    { 

    } 

    public int Id { get; set; } 
    public string Name { get; set; } 
    public int Addressid { get; set; } 

    [ForeignKey("AddressId")] 
    public virtual Address Address { get; set; } 
} 


public class Address 
{ 
    public Address 
    { 

    } 

    public int Id { get; set; } 
    public string Street { get; set; } 
    public int Number { get; set; } 
    public int Country { get; set; } 
    public int CustomerId { get; set; } 

    [ForeignKey("CustomerId")] 
    public virtual Customer Customer { get; set; }    
}