使用AutoMapper展开多对多关系

// 定义学生实体类
public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Course> Courses { get; set; }
}

// 定义课程实体类
public class Course
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Student> Students { get; set; }
}

// 定义学生课程中间表实体类
public class StudentCourse
{
    public int StudentId { get; set; }
    public int CourseId { get; set; }
}

// AutoMapper配置
var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Student, StudentDto>();
    cfg.CreateMap<Course, CourseDto>();
});

// 创建映射器
var mapper = config.CreateMapper();

// 获取学生和课程的数据
var students = dbContext.Students.Include(s => s.Courses).ToList();
var courses = dbContext.Courses.Include(c => c.Students).ToList();

// 将学生和课程转换为DTO对象
var studentDtos = mapper.Map<List<StudentDto>>(students);
var courseDtos = mapper.Map<List<CourseDto>>(courses);