如何在.NET Core API中设计嵌套类以获取特定的架构？

如何解决如何在.NET Core API中设计嵌套类以获取特定的架构？

我第一次在.NET Core API（使用最新版本的.NET Core）中使用Entity Framework。

目前我有2节课：

public class Employee
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Gender { get; set; }
    public DateTime JoinedCompany { get; set; }
    public ICollection<Skill> Skills { get; set; }
}

public class Skill
{
    public int Id { get; set; }
    public string SkillName { get; set; }
}

我也有一个DBContext类，

public DbSet<Employee> Employees { get; set; }
public DbSet<Skill> Skills { get; set; }

，我可以使用以下内容检索此信息：

public async Task<IReadOnlyList<Employee>> GetEmployeesAsync () {
            return await _context.Employees
            .Include(p => p.Skills)
            .ToListAsync();
        }

现在，我正在使用Entity Framework迁移来创建表。使用现有的类，我得到以下表格两个表格：

（1）带有以下列的“雇员”：Id，名字，姓氏，性别，JoinedCompany

（2）具有以下各项的“技能”：Id，SkillName，EmployeeId

我在这些表中填充了一些数据，并在邮递员中访问API的其中一个端点时返回了以下内容：

[
    {
        "firstName": "Jess","lastName": "Turner","gender": "F","joinedCompany": "2018-10-04T00:00:00","skills": [
            {
                "skillName": "T-SQL","id": 1
            },{
                "skillName": "Angular","id": 2
            },{
                "skillName": "Vue","id": 3
            },{
                "skillName": "Redux","id": 4
            }
        ],"id": 1
    },{
        "firstName": "Olivia","lastName": "Lu","joinedCompany": "2015-03-31T00:00:00","skills": [
            {
                "skillName": "Hadoop","id": 5
            },{
                "skillName": "Azure Databricks","id": 6
            },{
                "skillName": "Spark","id": 7
            },{
                "skillName": "Python","id": 8
            },{
                "skillName": "T-SQL","id": 9
            }
        ],"id": 2
    },{
        "firstName": "Jonah","lastName": "Smythe","gender": "M","joinedCompany": "2020-08-11T00:00:00","skills": [],"id": 3
     }
]

现在，我要弄清楚的是如何设计类，以便在运行时使用实体框架创建数据库，从而得到三个表：

（1）带有以下列的“雇员”：Id，名字，姓氏，性别，JoinedCompany

（1）带有以下列的“ EmployeeSkills”：Id，EmployeeId，SkillId

（2）包含以下各项的“技能”：Id，SkillName

原因是我不想为雇员每次都重复存储“ SkillName”字符串。我只想使用ID。 这也将改变我上面应用的GetEmployeesAsync方法。 谢谢。

解决方法

public class Employee
{
    public int Id { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public string Gender { get; set; }

    public DateTime JoinedCompany { get; set; }

    public ICollection<EmployeeSkill> Skills { get; set; } = new HashSet<EmployeeSkill>();
}

public class Skill
{
    public int Id { get; set; }

    public string SkillName { get; set; }

    public ICollection<EmployeeSkill> Emploees { get; set; } = new HashSet<EmployeeSkill>();
}

public class EmployeeSkill
{
    public int EmployeeId { get; set; }

    public Employee Employee { get; set; }

    public int SkillId { get; set; }

    public Skill Skill { get; set; }
}

public class MyDbContext : DbContext
{

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

    public DbSet<Skill> Skills { get; set; }

    public DbSet<EmployeeSkill> EmployeesSkills { get; set; }
}