c# - mvc - implement identity asp net

HttpContext.GetOwinContext(). GetUserManager<AppRoleManager>() devuelve null

Question

He usado ASP.NET Identity 2 para crear un rol, pero el resultado de HttpContext.GetOwinContext().GetUserManager<AppRoleManager>() fue nulo.

Entonces no pude crear el papel.

¿Como puedó resolver esté problema?

public class MVCController : Controller
{
    public MVCController()
    {

    }
    public AppRoleManager RoleManager // returns null ?!
    {
        get
        {
            return HttpContext.GetOwinContext().GetUserManager<AppRoleManager>();
        }
    }
    public User CurrentUser
    {
        get
        {
            string currentUserId = User.Identity.GetUserId();
            User currentUser = DataContextFactory.GetDataContext().Users.FirstOrDefault(x => x.Id.ToString() == currentUserId);
            return currentUser;
        }
    }
    public IAuthenticationManager AuthManager
    {
        get
        {

            return HttpContext.GetOwinContext().Authentication;
        }
    }
    public AppUserManager UserManager
    {
        get
        {
            return HttpContext.GetOwinContext().GetUserManager<AppUserManager>();
        }
    }
} 

Mi controlador:

public class RoleAdminController : MVCController
{
    [HttpPost]
    public async Task<ActionResult> CreateRole([Required]string name)
    {
        if (ModelState.IsValid)
        {
            if (RoleManager != null) // RoleManager is null, why?!
            {
                IdentityResult result = await RoleManager.CreateAsync(new Role { Name = name });
                if (result.Succeeded)
                {
                    return RedirectToAction("Index");
                }
                else
                {
                    AddErrorsFromResult(result);
                }
            }
        }
        return View(name);
    }
}

AppRoleManager:

public class AppRoleManager : RoleManager<Role, int>, IDisposable
{
    public AppRoleManager(RoleStore<Role, int, UserRole> store)
        : base(store)
    {
    }
    public static AppRoleManager Create(IdentityFactoryOptions<AppRoleManager> options, IOwinContext context)
    {
        return new AppRoleManager(new RoleStore<Role, int, UserRole>(DataContextFactory.GetDataContext()));
    }
}

Answer 1

Lo más probable es que haya perdido a OwinContext la manera de crear ApplicationUserManager.
Para eso necesitarás tener esto en tu public void Configuration(IAppBuilder app)

app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
app.CreatePerOwinContext<AppRoleManager>(AppRoleManager.Create);

Esto registrará a los delegados que crean UserManager y RoleManager con OwinContext y solo después de eso puede volver a llamar a estos en sus controladores.

Answer 2

Sé que es una publicación antigua, pero quiero compartir mis investigaciones con otros, para este problema creé una clase parcial y agregué todas mis referencias de owin allí:

public partial class Startup
    {
        public void ConfigureAuth(IAppBuilder app)
        {
            // Configure the db context, user manager and signin manager to use a single instance per request
            app.CreatePerOwinContext(IdentityModels.Create);
            app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
            app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);
app.CreatePerOwinContext<AppRoleManager>(AppRoleManager.Create);

            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
                LoginPath = new PathString("/Account/Login"),
                Provider = new CookieAuthenticationProvider
                {
                    // Enables the application to validate the security stamp when the user logs in.
                    // This is a security feature which is used when you change a password or add an external login to your account.  
                    OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
                validateInterval: TimeSpan.FromMinutes(30),
                regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
                }
            });


        }
    }

Luego utilizo este método en otro inicio parcial:

  public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            ConfigureAuth(app);
        }
    }