在实体框架 6 中不起作用的实体之间的一对一关系

Question

我需要使用实体框架将数据存储在三个表之间的关系中：

一对多
员工 --> 地址
员工 --> 工资单
员工 --> 联系方式

这种关系表明每个员工都有地址、工资单和联系方式。从技术上讲，我正在尝试将 EmployeeId 作为外键链接到所有三个表 - 地址、工资单和联系人。此外，在 Employee 表中，我将 AddressId、PayrollId 和 ContactId 存储为外键，从而产生 1:1 的关系。 我正在尝试按如下方式构建架构：
员工实体 - Employee.cs

<code>
    [Table("tbl_Employee")]
    public class Employee: BaseEntity
    {
        [Key]
        public Guid EmployeeId { get; set; }
        [MaxLength]
        public string FirstName { get; set; }
        [MaxLength]
        public string MiddleName { get; set; }
        [MaxLength]
        public string LastName { get; set; }
        public DateTime DateOfBirth { get; set; }
        public string Gender { get; set; }
        public bool IsActive { get; set; }
        [Required]
        public Guid AddressId { get; set; }
        [Required]
        public Guid ContactId { get; set; }
        [Required]
        public Guid PayrollId { get; set; }
        //FK References
        [ForeignKey("AddressId")]
        public virtual Address Address { get; set; }
        [ForeignKey("ContactId")]
        public virtual Contact Contact { get; set; }
        [ForeignKey("PayrollId")]
        public virtual Payroll Payroll { get; set; }
    }
</code>

地址实体 - Address.cs

<code>
[Table("tbl_Address")]
    public class Address: BaseEntity
    {
        [Key]
        public Guid AddressId { get; set; }
        public string House { get; set; }
        public string Ward { get; set; }
        public string Street { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string Country { get; set; }
        public string PinCode { get; set; }
        public string AreaCode { get; set; }
        public string Landmark { get; set; }
        [Required]
        public Guid EmployeeId { get; set; }

        //FK References
        [ForeignKey("EmployeeId")]
        public virtual Employee Employee { get; set; }
    }
</code>

联系实体 - Contact.cs

<code>
[Table("tbl_Contact")]
    public class Contact: BaseEntity
    {
        [Key]
        public Guid ContactId { get; set; }
        public string Landline { get; set; }
        public string Mobile { get; set; }
        public string Fax { get; set; }
        public string EmailAddress { get; set; }
        [Required]
        public Guid EmployeeId { get; set; }

        //FK References
        [ForeignKey("EmployeeId")]
        public virtual Employee Employee { get; set; }
    }
</code>

工资单实体 - Payroll.cs

<code>
[Table("tbl_Payroll")]
    public class Payroll: BaseEntity
    {
        [Key]
        public Guid PayrollId { get; set; }
        public decimal BasicPay { get; set; }
        public decimal FlexiblePay { get; set; }
        public decimal PFContribution { get; set; }
        public decimal Allowances { get; set; }
        public decimal TotalPay { get; set; }
        [Required]
        public Guid EmployeeId { get; set; }

        //FK References
        [ForeignKey("EmployeeId")]
        public virtual Employee Employee { get; set; }
    }
</code>

当我尝试使用包管理器控制台添加迁移时，它显示以下错误：

无法确定之间关联的主体端 类型“NewEmployeeBuddy.Data.Entities.Employee.Employee”和 'NewEmployeeBuddy.Data.Entities.Employee.Address'。主体端 必须使用以下任一方法显式配置此关联 关系流式 API 或数据注释。

I googled about it and found this link http://stackoverflow.com/questions/6531671/what-does-principal-end-of-an-association-means-in-11-relationship-in-entity-fr  howeverstill getting the same error. Can someone please suggest any change in the code? 

Answer 1

在地址、工资单、联系人中尝试删除外键，在主键中使用类似 [Key, ForeignKey("Employee")] 的内容。

更新： 例如地址类应该是：

Table("tbl_Address")]
public class Address: BaseEntity
{
    [Key, ForeignKey("Employee")]
    public Guid AddressId { get; set; }
    public string House { get; set; }
    public string Ward { get; set; }
    public string Street { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Country { get; set; }
    public string PinCode { get; set; }
    public string AreaCode { get; set; }
    public string Landmark { get; set; }

    public virtual Employee Employee { get; set; }
}