Question

这些是我的实体：

public class Department
{
    public Department()
    {
        Employees = new List<Employee>();
    }

    public int ID { get; set; }
    public string Name { get; set; }

    public IList<Employee> Employees { get; set; }
}

public class Employee
{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int DepartmentID { get; set; }
    public Department Department { get; set; }
}

public class User
{
    public int ID { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public int EmployeeID { get; set; }
    public Employee Employee { get; set; }
}

部门有很多员工。每个用户都有只一名员工（一对一）。我怎样才能首先用流畅的代码实现这种关系呢？

感谢名单。

Answer 1

由于您没有使用共享主键，因此可以将其映射为“一对多”关系，并忽略“多个”侧。

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        ...

        modelBuilder.Entity<User>()
         .HasRequired(u => u.Employee)
         .WithMany()
         .HasForeignKey(u => u.EmployeeId);

    }

实体的关系？

1 个答案: