ASP.NET Core 2.2:无法解析类型“AutoMapper.IMapper”的服务

ASP.NET核心(版本:2.2.102)

我正在构建一个API以返回Portos和Species,但每当我访问/API/Portos(在控制器中定义)时,我都会遇到以下错误:

InvalidOperationException:无法解析类型的服务 “鱼。控制器。端口控制器”。

Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp,类型类型,类型要求者,布尔isDefaultParameterRequired)

我不确定我做错了什么,所以非常感谢您的帮助。

模型

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace fish.Models
{
    [Table("Especies")]
    public class Especie
    {
        public int Id { get; set; }
        [Required]
        [StringLength(255)]
        public string Nome { get; set; }

        public Porto Porto { get; set; }
        public int PortoId { get; set; }
    }
}

波尔图

using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel.DataAnnotations;

namespace fish.Models
{
    public class Porto
    {
        public int Id { get; set; }
        [Required]
        [StringLength(255)]
        public string Nome { get; set; }
        public ICollection<Especie> Models { get; set; }

        public Porto()
        {
            Models = new Collection<Especie>();
        }
    }
}

控制器

PortoController.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using AutoMapper;
using AutoMapper.QueryableExtensions;
using fish.Controllers.Resources;
using fish.Models;
using fish.Persistence;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace fish.Controllers
{
    public class PortosController : Controller
    {
        private readonly FishDbContext context;
        private readonly IMapper mapper;
        public PortosController(FishDbContext context, IMapper mapper)
        {
            this.mapper = mapper;
            this.context = context;
        }


        [HttpGet("/api/portos")]
        public async Task<IEnumerable<PortoResource>> GetPortos()
        {
            var portos = await context.Portos.Include(m => m.Models).ToListAsync();

            return mapper.Map<List<Porto>, List<PortoResource>>(portos);
        }

    }
}

PortoResources.cs

using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace fish.Controllers.Resources
{
    public class PortoResource
    {
        public int Id { get; set; }
        public string Nome { get; set; }
        public ICollection<EspecieResource> Models { get; set; }

        public PortoResource()
        {
            Models = new Collection<EspecieResource>();
        }
    }
}

特别资源

namespace fish.Controllers.Resources
{
    public class EspecieResource
    {
        public int Id { get; set; }
        public string Nome { get; set; }
    }
}

Stratup.cs

public void ConfigureServices(IServiceCollection services)
{
        services.AddAutoMapper();

        services.AddDbContext<FishDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("Default")));

        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

        // In production, the Angular files will be served from this directory
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "ClientApp/dist";
        });
}

MappingProfile.cs

using AutoMapper;
using fish.Controllers.Resources;
using fish.Models;

namespace fish.Mapping
{
    public class MappingProfile : Profile
    {
        public MappingProfile()
        {
            CreateMap<Porto, PortoResource>();
            CreateMap<Especie, EspecieResource>();
        }
    }
}

using fish.Models;
using Microsoft.EntityFrameworkCore;

namespace fish.Persistence
{
    public class FishDbContext : DbContext
    {
        public FishDbContext(DbContextOptions<FishDbContext> options) : base(options)
        {

        }

        public DbSet<Porto> Portos { get; set; }
    }
}