/// <summary>
    /// Помощник по ролям
    /// </summary>
    public   class RolesHelper: IInitializer
    {
        /// <summary>
        /// Инициализируем список ролей
        /// </summary>
        private  List<string> AppRoles = new List<string>() {"Admin","ClaimManager", "EquipmentUser" };
        protected private RoleManager<IdentityRole> RoleManager { get; }

        public RolesHelper(RoleManager<IdentityRole> roleManager   )
        {
            RoleManager = roleManager;
        }

        public async void Initialize()
        {
            try
            { 
                foreach (string item in AppRoles)
                {
                    if (!await RoleManager.RoleExistsAsync(item))
                   {
                        await RoleManager.CreateAsync(new IdentityRole(item));
                   }
                }
            }
            catch (Exception ex)
            {

                throw;
            }

        }

    }

            #region DI
            services.AddTransient<IInitializer,RolesHelper>();
            #endregion

  serviceProvider.GetService<IInitializer>().Initialize();

   public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            IoCContainer.Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        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;
            });

            // Add ApplicationDbContext to DI
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(IoCContainer.Configuration["connectionStrngs:default"]));



            services.AddIdentity<ApplicationUser, IdentityRole>()
           .AddEntityFrameworkStores<ApplicationDbContext>()
           .AddDefaultTokenProviders();


            #region DI
            services.AddTransient<IInitializer,RolesHelper>();
            #endregion

            // Change password policy
            services.Configure<IdentityOptions>(options =>
            {
                // Make really weak passwords possible
                options.Password.RequireDigit = false;
                options.Password.RequiredLength = 5;
                options.Password.RequireLowercase = true;
                options.Password.RequireUppercase = false;
                options.Password.RequireNonAlphanumeric = false;

                // Make sure users have unique emails
                options.User.RequireUniqueEmail = true;
            });


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

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public  async void Configure(
            IApplicationBuilder app, 
            IHostingEnvironment env,
            IServiceProvider serviceProvider )
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseCookiePolicy();

            app.UseAuthentication();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Account}/{action=Login}");
            });

            serviceProvider.GetService<ApplicationDbContext>().Database.EnsureCreated();
            serviceProvider.GetService<IInitializer>().Initialize();
   
        }
    }

 serviceProvider.GetService<IInitializer>().Initialize();

async void

 await serviceProvider.GetService<IInitializer>().Initialize();

new List<string>() {"Admin","ClaimManager", "EquipmentUser" };

new list<claim>
{ 
new Claim(ClaimTypes.Role, "Aminsssss")
.... 

///в ConfigureServices
       services.AddTransient<IInitializer,RolesHelper>();


//в Configure
    using (var serviceScope = app.ApplicationServices.CreateScope())
            {
                await serviceScope.ServiceProvider.GetService<IInitializer>().Initialize();
            }