如何使用AutoMapper将多对多关系表中的信息映射到实体模型类

// 引入AutoMapper命名空间
using AutoMapper;

// 创建实体模型类
public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Course> Courses { get; set; }
}

public class Course
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Student> Students { get; set; }
}

// 创建关系表的数据访问对象
public class StudentDAO
{
    public int StudentId { get; set; }
    public int CourseId { get; set; }
}

public class CourseDAO
{
    public int CourseId { get; set; }
    public int StudentId { get; set; }
}

// 在AutoMapper的配置文件中配置映射关系
public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<StudentDAO, Student>()
            .ForMember(dest => dest.Id, opt => opt.MapFrom(src => src.StudentId))
            .ForMember(dest => dest.Courses, opt => opt.Ignore());

        CreateMap<CourseDAO, Course>()
            .ForMember(dest => dest.Id, opt => opt.MapFrom(src => src.CourseId))
            .ForMember(dest => dest.Students, opt => opt.Ignore());
    }
}

// 在代码中使用AutoMapper进行映射
public class Program
{
    public static void Main()
    {
        // 初始化AutoMapper配置
        var config = new MapperConfiguration(cfg => cfg.AddProfile<MappingProfile>());
        var mapper = config.CreateMapper();

        // 模拟从数据库中获取关系表数据
        var studentDAO = new StudentDAO { StudentId = 1, CourseId = 1 };
        var courseDAO = new CourseDAO { CourseId = 1, StudentId = 1 };

        // 使用AutoMapper进行映射
        var student = mapper.Map<Student>(studentDAO);
        var course = mapper.Map<Course>(courseDAO);

        // 输出映射结果
        Console.WriteLine($"Student: Id={student.Id}, Name={student.Name}");
        Console.WriteLine($"Course: Id={course.Id}, Name={course.Name}");
    }
}