[AutoMapper]AutoMapper Hello world

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一、建立新專案

二、NuGet加入套件
透過 NuGet 安裝 AutoMapper.Extensions.Microsoft.DependencyInjection 套件

三、註冊 AutoMapper
於 Program.cs 裡檔案加上如下程式碼

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builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());

四、新增來源的 DbModel 與要對應到的 ViewModel 類別
資料結構如下圖

DbModel.cs

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namespace WebApplication1.Model
{
    public class DbModel
    {
        public int Id { get; set; }
        public string? Name { get; set; }
        public int Age { get; set; }
        public DateTime CreatedDate { get; set; }
    }
}

ViewModel.cs

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namespace WebApplication1.Model
{
    public class ViewModel
    {
        public int Id { get; set; }
        public string? Name { get; set; }
        public int Age { get; set; }
    }
}

五、加上 Profile 對應檔
資料結構如下圖

ExampleMapping.cs

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using AutoMapper;
using WebApplication1.Model;

namespace WebApplication1.Profiles
{
    public class ExampleMapping : Profile
    {
        public ExampleMapping()
        {
            CreateMap<DbModel, ViewModel>();
        }
    }
}

六、加入帶有測試資料的 api
資料結構如下圖

ExampleController.cs

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using AutoMapper;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Model;

namespace WebApplication1.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class ExampleController : Controller
    {
        private readonly IMapper _mapper;
        public ExampleController(IMapper mapper)
        {
            _mapper = mapper;
        }

        [HttpGet("Index")]
        public IEnumerable<ViewModel> Index()
        {
            var DbModel = new List<DbModel>();
            //新增DbModel的List模擬從資料庫來的資料
            DbModel.Add(new DbModel() { Id = 1, Name = "Bill", Age = 18, CreatedDate = DateTime.Now });
            DbModel.Add(new DbModel() { Id = 1, Name = "CI-YU", Age = 20, CreatedDate = DateTime.Now });
            DbModel.Add(new DbModel() { Id = 1, Name = "Bill Huang", Age = 22, CreatedDate = DateTime.Now });
            //將DbModel資料自動與ViewModel做對應(相同名稱的屬性)
            var map = _mapper.Map<IEnumerable<ViewModel>>(DbModel);
            return map;
        }
    }
}

七、執行結果

參考資料：
[.net 6] Automapper範例