Question

我正在尝试为我的数据库创建代码优先模型，我必须在单个表上创建一个多对多关系，并具有一些其他属性。我的课程如下：

public class Contact
{
    [Key, Column(Order = 1)]
    [ForeignKey("User")]
    public Guid Owner { get; set; }
    [Key, Column(Order = 2)]
    [ForeignKey("User")]
    public Guid UserID { get; set; }
    [MaxLength(50)]
    public string FirstName { get; set; }
    [MaxLength(50)]
    public string LastName { get; set; }

    // Navigation properties
    public User User { get; set; }
    public User User1 { get; set; }
}

我的User类现在相当简单，但它看起来像这样：

public class User
{
    public Guid ID { get; set; }
    [MaxLength(50)]
    public string Email { get; set; }
    [MaxLength(50)]
    public string FirstName { get; set; }
    [MaxLength(50)]
    public string LastName { get; set; }

    public List<Contact> Owner { get; set; }
    public List<Contact> Contacts { get; set; }
}

我试图这样做，但每当我尝试从任何模型访问数据时，我都会收到异常。异常消息指出＆＃34; Contact在数据库中创建循环＆＃34;并提供InvalidOperationException异常。

请帮我解决这个问题。谢谢。

Answer 1

尝试添加InversePropertyAttribute，同时修复其余代码：

public class Contact
{
    //other properties...

    [Key, Column(Order = 1)]
    [ForeignKey("User")]
    public Guid Owner { get; set; }
    [Key, Column(Order = 2)]
    [ForeignKey("User1")]
    public Guid UserID { get; set; }

    public virtual User User { get; set; }
    public virtual User User1 { get; set; }
}

public class User
{
    //other properties...

    [InverseProperty("User")]
    public virtual ICollection<Contact> Owner { get; set; }
    [InverseProperty("User1")]
    public virtual ICollection<Contact> Contacts { get; set; }
}

单个表上的多对多关系首先使用代码和其他属性

1 个答案: