GetUserAsync返回null

Question

我有一个Net Core MVC项目，在其中我使用用户身份，注册，登录等。

我的问题是，当我登录时，我将其重定向到文章索引，我想让用户使用await _userManager.GetUserAsync (User)登录，但返回null。

我向您展示了部分代码（如果您需要查看更多内容，请告诉我）。

LoginController

// is called when press submit button in register
public async Task<string> RegisterUser(RegisterViewModel model)
    {
        try
        {
            ErrorViewModel message = new ErrorViewModel();

            bool x = await _roleManager.RoleExistsAsync("Customer");
            if (!x)
            {
                var role = new IdentityRole
                {
                    Name = "Customer"
                };
                await _roleManager.CreateAsync(role);
            }

            User user = new User
            {
                UserName = model.Email,
                Name = model.Name,
                Surname = model.Surname,
                PhoneNumber = model.Phone,
                Email = model.Email,
                Address = model.Address,
                LockoutEnabled = true,
                LockoutEnd = DateTime.Now.AddYears(10)
            };

            var result = await _userManager.CreateAsync(user, model.Password);
            if (result.Succeeded)
            {
                var result1 = await _userManager.AddToRoleAsync(user, "Customer");
                return "Ok";
            }
            else
            {
                if (result.Errors.First().Code.Equals("PasswordRequiresLower"))
                {
                    message.ErrorMsg = "La clave debe contener al menos una letra.";
                    return "Clave incorrecta";
                }
                message.ErrorMsg = "El email ingresado ya esta registrado en el sistema.";
                return "Email incorrecto";
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            return "Error";
        }
    }


// is called when press submit button in login
public string LogInUser(LoginViewModel model)
    {
        if (_userDataAccess.Exist(model.Username))
        {
            User user = _userManager.FindByEmailAsync(model.Username).GetAwaiter().GetResult();
            if (user == null)
                user = _userManager.FindByNameAsync(model.Username).GetAwaiter().GetResult();

            if (!user.LockoutEnabled && user.AccessFailedCount < 10)
            {
                _userManager.ResetAccessFailedCountAsync(user).GetAwaiter().GetResult();
                _userManager.SetLockoutEnabledAsync(user, false).GetAwaiter().GetResult();
                _userManager.SetLockoutEndDateAsync(user, DateTime.Now.AddDays(365)).GetAwaiter().GetResult();
            }
            else if (user.LockoutEnabled)
            {
                return "Su cuenta esta desactivada.";
            }

            var result = _signInManager.PasswordSignInAsync(user, model.Password, true, lockoutOnFailure: true).GetAwaiter().GetResult();
            if (!_userManager.IsEmailConfirmedAsync(user).GetAwaiter().GetResult())
            {
                if (result.Succeeded)
                {
                    if (user.AccessFailedCount > 0)
                    {
                        _userManager.ResetAccessFailedCountAsync(user).GetAwaiter().GetResult();
                        _userManager.SetLockoutEnabledAsync(user, false).GetAwaiter().GetResult();
                    }
                    return "Ok";
                }
                else if (result.IsLockedOut)
                {
                    return "Su cuenta esta desactivada.";
                }
                else
                {
                    return "Incorrecto";
                }
            }
            else
            {
                return "El usuario no ha confirmado la cuenta";
            }
        }
        else
            return "El nombre de usuario es incorrecto";
    }

ArticuloController

public async Task<IActionResult> Index()
{
    var user = await _userManager.GetUserAsync(HttpContext.User);
    // here after successful login, user is null

    List<Articulo> list = _articuloDataAccess.GetAll();
    return View(list);
}

Startup.cs

public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddEntityFrameworkSqlServer().AddDbContext<MuebleriaDBContext>();

        services.AddIdentity<User, IdentityRole>(options =>
        {
            options.Password.RequireDigit = false;
            options.Password.RequireUppercase = false;
            options.Password.RequireNonAlphanumeric = false;
        })
        .AddEntityFrameworkStores<MuebleriaDBContext>()
        .AddDefaultTokenProviders();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
    }