Question

用户和管理员是1对1的关系，其中1个用户只有1个管理员角色。

之前我通过在此链接Click here之后的管理员类的第一行添加[Key]来修复了ModelValidationException，但现在我收到了此错误：

无法确定之间关联的主要结束类型＆＃39; RecreationalServicesTicketingSystem.Models.Administrator＆＃39;和＆＃39; RecreationalServicesTicketingSystem.Models.User＆＃39 ;.主要目的必须使用以下任一方式显式配置此关联关系流畅的API或数据注释。

我尝试过这个解决方案，但它仍然给了我同样的错误。Click Here

User.cs

public class User
    {
        public int UserID { get; set; }
        [StringLength(50, MinimumLength = 1)]
        public string LastName { get; set; }
        [StringLength(50, MinimumLength = 1, ErrorMessage = "First name cannot be longer than 50 characters.")]
        [Column("FirstName")]
        public string FirstMidName { get; set; }
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime EnrollmentDate { get; set; }

        public int DepotID { get; set; }
        public int DepartmentID { get; set; }
        public int TicketID { get; set; }


        public string FullName
        {
            get { return LastName + ", " + FirstMidName; }
        }

        //Setting up relationships A use can apply for any number of tickets, so Tickets is defined as a collection of Ticket entities.
        public virtual ICollection<Ticket> Tickets { get; set; }

        //Setting up relationships Users can only have ONE adminstrator so we use public virtual Administrator Administrator { get; set; }
        public virtual Administrator Administrator { get; set; }
        public virtual Department Department { get; set; }

        public virtual Depot Depot { get; set; }
    }

Administrator.cs

public class Administrator
{
    [Key]
    public int AdminID { get; set; }
    public int TicketID { get; set; }   
    public int UserID { get; set; }
    [StringLength(50)]
    public string AdminRole { get; set; }
    public virtual ICollection<Ticket> Tickets { get; set; }
    public virtual User User { get; set; }
}

这是在我执行用户和管理员迁移的configuration.cs中。

用户

 var users = new List<User>
            {
                new User { FirstMidName = "lala",   LastName = "la", 
                    EnrollmentDate = DateTime.Parse("2016-02-18") },
                new User { FirstMidName = "baba", LastName = "baba",    
                    EnrollmentDate = DateTime.Parse("2016-02-18") },
                new User { FirstMidName = "dada",   LastName = "dada",     
                    EnrollmentDate = DateTime.Parse("2016-02-18") },
                new User { FirstMidName = "Christine",   LastName = "West",     
                    EnrollmentDate = DateTime.Parse("2016-02-18") },

            };

管理员

    var administrator = new List<Administrator>
    {
        new Administrator {AdminID = 1, AdminRole = "Administrator LVL1", User = users.Single ( s => s.UserID == 1),
        Tickets = new List<Ticket>() },
        new Administrator {AdminID = 2, AdminRole = "Administrator LVL2", User = users.Single ( s => s.UserID == 2),
        Tickets = new List<Ticket>() },
        new Administrator {AdminID = 3, AdminRole = "Administrator LVL3", User = users.Single ( s => s.UserID == 3),
        Tickets = new List<Ticket>() }



    };
    administrator.ForEach(s => context.Administrators.AddOrUpdate(p => p.AdminID, s));
    context.SaveChanges();
}

使用实体框架的无效操作异常MVC

0 个答案: