Configurar AutoMapper

README.md

Instalar

https://www.nuget.org/packages/AutoMapper.Extensions.Microsoft.DependencyInjection/

ApiController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using AutoMapper;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using peliculasAPI.DTOs;
using peliculasAPI.Entidades;

// For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace peliculasAPI.Controllers
{
    [Route("api/generos")]
    [ApiController]
    public class GenerosController : ControllerBase
    {

        private readonly ILogger<GenerosController> logger;
        private readonly ApplicationDbContext context;
        private readonly IMapper mapper;

        public GenerosController(ILogger<GenerosController> logger, ApplicationDbContext context, IMapper mapper)
        {
            this.logger = logger;
            this.context = context;
            this.mapper = mapper;
        }

        [HttpGet]
        public async Task<ActionResult<List<GeneroDTO>>> Get()
        {
            var generos = await context.Generos.ToListAsync();

            return mapper.Map<List<GeneroDTO>>(generos);
        }
        
    }
}

AutoMapperProfiles.cs

using System;
using AutoMapper;
using peliculasAPI.DTOs;
using peliculasAPI.Entidades;

namespace API.Utilidades
{
    public class AutoMapperProfiles : Profile
    {
        public AutoMapperProfiles()
        {
            CreateMap<Genero, GeneroDTO>();
            
            // CreateMap<Genero, GeneroDTO>().ReverseMap();
        }
    }
}

Startup.cs

public class Startup
{
    
    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddAutoMapper(typeof(Startup));
        /// ...
    }
    
}