实体框架一对一关系

本文关键字：关系 一对一 框架 实体 | 更新日期: 2023-09-27 18:37:13

我首先在

应用程序中使用实体框架 6 代码使用以下模型。

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; }              
}

当我尝试保存它们时，出现以下错误：

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

实体框架一对一关系

您需要专门化外键关系。 如此处所述，尝试[ForeignKey("CustomerId")]在public virtual Customer Customer { get; set; }和 [ForeignKey("AddressId")] public virtual Address Address { get; set; }，并将这些 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; }              
}
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