在尝试激活 'Controllers.AccountsController' 时无法解析类型 'Microsoft.AspNetCore.Identity.UserManager 的服务

Question

我在 AccountsController 中有以下代码：

using System.Threading.Tasks;
using AutoMapper;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Products.Helpers;
using Products.Models;
using Products.ViewModels;

namespace Products.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class AccountsController : Controller
    {
        private readonly ContextUsers _appDbContext;
        private readonly UserManager<AppUser> _userManager;
        private readonly IMapper _mapper;

    public AccountsController(ContextUsers context,UserManager<AppUser> userManager,IMapper mapper)
    {
        _appDbContext = context;
        _userManager = userManager;
        _mapper = mapper;
    }


    [HttpPost]
    public async Task<IActionResult> Post([FromBody]RegistrationViewModel model)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        var userIdentity = _mapper.Map<AppUser>(model);

        var result = await _userManager.CreateAsync(userIdentity, model.Password);

        if (!result.Succeeded) return new BadRequestObjectResult(Errors.AddErrorsToModelState(result, ModelState));

        await _appDbContext.Customers.AddAsync(new Customer { IdentityId = userIdentity.Id, Location = model.Location });
        await _appDbContext.SaveChangesAsync();
        return new OkObjectResult("Account created");
    }
}

}

我在 AppUser 中有以下代码 class:

public class AppUser : IdentityUser
{
  // Extended Properties
  public string FirstName { get; set; }
  public string LastName { get; set; }
  public long? FacebookId { get; set; }
  public string PictureUrl { get; set; }
}

以及以下客户 class：

public class Customer
{
 public int Id { get; set; }
 public string IdentityId { get; set; }
 public AppUser Identity { get; set; }  // navigation property
 public string Location { get; set; }
 public string Locale { get; set; }
 public string Gender { get; set; }
}

当我在 postman 中发出 post 请求时，出现以下错误：

InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Identity.UserManager`1[Products.Models.AppUser]' while attempting to activate 'Products.Controllers.AccountsController'.
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, bool isDefaultParameterRequired)

我正在尝试创建一个用户，但是当我发出 post 请求时甚至没有进入控制器，所以我无法调试

来自 startup.cs 的 ConfigureServices 方法：

public void ConfigureServices(IServiceCollection services)
        {

                .AddCors(o => o.AddPolicy("AllowAllOrigins", builder =>
            {
                builder.AllowAnyMethod()
                    .AllowAnyHeader()
                    .AllowAnyOrigin();
            }));

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            services.AddDbContext<Context>(options =>
                    options.UseSqlServer(Configuration.GetConnectionString("LaprDB")));
            services.AddDbContext<ContextUsers>(options =>
                options.UseSqlServer(Configuration.GetConnectionString("MyDbConnection")));


            services.AddHostedService<TimedHostedService>();

             services.AddAutoMapper();


        }

Answer 1

您缺少将标识对象添加到 DI 容器的行。您需要调用 AddDefaultIdentity 方法。将此行添加到 Startup class:

中的 ConfigureServices 方法

services.AddDefaultIdentity<AppUser>()
    .AddEntityFrameworkStores<ContextUsers>();

有关设置身份的更多信息，请参阅here。