Question

我有一个班级＆＃34;用户＆＃34;我添加了以下字段：

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

    [ForeignKey("CreatedBy_Id")]
    public User CreatedBy { get; set; }

    public int? UpdatedBy_Id { get; set; }

    [ForeignKey("UpdatedBy_Id")]
    public User UpdatedBy { get; set; }

当我尝试使用此命令将这些字段推入数据库时：

Add-Migration -Configuration DataModel.DevMigrations.Configuration TestAlterUser

我收到此错误：

无法确定之间关联的主要结束   类型＆＃39; DataModel.Entities.User＆＃39;和   ＆＃39; DataModel.Entities.User＆＃39 ;.

必须明确配置此关联的主要结尾   使用关系流畅的API或数据注释。

如果我删除了UpdatedBy属性（或CreatedBy），它可以完美地运行。

完整用户的课程：

public class User
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    [Required]
    [MaxLength(50)]
    public string Login { get; set; }

    [Required]
    [MaxLength(50)]
    public string LastName { get; set; }

    [MaxLength(50)]
    public string FirstName { get; set; }

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

    [ForeignKey("CreatedBy_Id")]
    public User CreatedBy { get; set; }

    public int? UpdatedBy_Id { get; set; }

    [ForeignKey("UpdatedBy_Id")]
    public User UpdatedBy { get; set; } 
}

Answer 1

尝试使用InverseProperty属性：

public class User
{
    public int Id { get; set; }
    [Required]
    [MaxLength(50)]
    public string Login { get; set; }
    [Required]
    [MaxLength(50)]
    public string LastName { get; set; }
    [MaxLength(50)]
    public string FirstName { get; set; }

    [Required]
    public int CreatedBy_Id { get; set; }
    [ForeignKey("CreatedBy_Id")]
    public virtual User CreatedBy { get; set; }

    public int? UpdatedBy_Id { get; set; }
    [ForeignKey("UpdatedBy_Id")]
    public virtual User UpdatedBy { get; set; } 

    //add these properties
    [InverseProperty("CreatedBy")]
    public virtual ICollection<User> WereCreated {get; set;}
    [InverseProperty("UpdatedBy")]
    public virtual ICollection<User> WereUpdated {get; set;}
}

无法确定关联的主要结尾 - EF Code First

1 个答案: