Asp.Net Web Api，从外部表“代码优先数据库”返回或包含值

Question

我正在尝试返回单个员工，包括外国表中的值。

这是我的 Employee 模型类

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

        [Required]
        [MaxLength(100)]
        public string EmployeeName { get; set; }

        [ForeignKey("Department")]
        public int DepartmentId { get; set; }
        public Department Department { get; set; }

        [ForeignKey("Gender")]
        public int GenderId { get; set; }
        public Gender Gender { get; set; }


    }

部门和性别模型类

public class Department
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int DepartmentId { get; set; }
        [Required]
        [MaxLength(50)]
        public string DepartmentName { get; set; }
    }

public class Gender
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int GenderId { get; set; }
        [Required]
        [MaxLength(50)]
        public string GenderName { get; set; }
    }

使用下面的代码，我可以在返回时返回包含的部门名称和性别名称

all employees
// GET: api/Employees
        public IQueryable<Employee> GetEmployees()
        {
            return db.Employees.Include(c => c.Department).Include(g => g.Gender); ;
        }

但是当我想退回一名单身员工时，我不知道如何退回……我将部门和性别设为空。 这是我的代码。我不知道如何在这个单一员工中包含部门名称和性别名称。我只得到了 DepartmentId 和 GenderId，但没有得到 DepartmentName 和 GenderName。

[ResponseType(typeof(Employee))]
        public async Task<IHttpActionResult> GetEmployee(int id)
        {
            Employee employee = await db.Employees.FindAsync(id);
            if (employee == null)
            {
                return NotFound();
            }

            return Ok(employee);
        }

提前谢谢你！

Answer 1

试试

return await db.Employees.Include(c => c.Department).Include(g => g.Gender).SingleAsync(e => e.EmployeeId == id);