AutoMapper基本使用

导包
AutoMapper
AutoMapper.Extensions.Microsoft.DependencyInjection

假如需要将Student映射为StudentCopy

namespace WebApplication14
{
    public class Student
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public string Sex { get; set; }
    }
    public class StudentCopy
    {
        public string FullName { get; set; }
        public int Age { get; set; }
        public string Sex { get; set; }
    }
}

新建一个配置类，用于指明映射关系，谁映射到谁

using AutoMapper;

namespace WebApplication14.Profiles
{
    public class MapperProfile : Profile
    {
        public MapperProfile()
        {
            // source -> target
			//CreateMap<Student, StudentCopy>()
			
			//.ForMember非必须，当两个类需要映射的属性名称不一致时可以使用此方法，来指定哪个属性应该映射为哪个属性，例如此处Student.Name需要映射为StudentCopy.FullName
            CreateMap<Student, StudentCopy>().ForMember(dest => dest.FullName, option => option.MapFrom(source => source.Name));
            
        }
    }
}

在Startup添加AutoMapper服务

services.AddAutoMapper(typeof(Startup));

之后从容器中获取AutoMapper服务并使用即可
例如：_mapper.Map<StudentCopy>(student)

using AutoMapper;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;

namespace WebApplication14.Controllers
{
    [ApiController]
    [Route("[controller]/[action]")]
    public class WeatherForecastController : ControllerBase
    {
        private readonly IMapper _mapper;

        public WeatherForecastController(IMapper mapper)
        {
            _mapper = mapper;
        }

        [HttpGet]
        public string Test()
        {
            Student student = new()
            {
                Name = "张三",
                Age = 18,
                Sex = "男"
            };

            var studentCopy = _mapper.Map<StudentCopy>(student);

            return JsonConvert.SerializeObject(studentCopy);
        }
    }
}