ASP.NET MVC 5 自定义 RoleProvider 无法从数据库中检索用户名的角色

我使用 Autofac 和 asp.net MVC 5，以及通用存储库模式

我创建自定义 RoleProvider

自定义角色提供者

namespace Web.Utility.Classes
{
    class GoldenBodyProvider : RoleProvider
    {
        private readonly IUnitOfWork _unitOfWork;

        private readonly IService _service;

        public GoldenBodyProvider()
        {
        }

        public GoldenBodyProvider(IUnitOfWork unitOfWork, IService service)
        {
            _unitOfWork = unitOfWork;
            _service = service;
        }

        public override bool IsUserInRole(string username, string roleName)
        {
            throw new NotImplementedException();
        }

        public override string[] GetRolesForUser(string username)
        {
            var role = (from u in  _service.UserRepository.GetAll()
                        join r in _service.RoleRepository.GetAll() on u.RoleId equals r.Id
                        where u.MobileNumber == username
                        select r.RoleInSystem).ToArray();
            return role;
        }

    public override void CreateRole(string roleName)
        {
            throw new NotImplementedException();
        }

        public override bool DeleteRole(string roleName, bool throwOnPopulatedRole)
        {
            throw new NotImplementedException();
        }

        public override bool RoleExists(string roleName)
        {
            throw new NotImplementedException();
        }

        public override void AddUsersToRoles(string[] usernames, string[] roleNames)
        {
            throw new NotImplementedException();
        }

        public override void RemoveUsersFromRoles(string[] usernames, string[] roleNames)
        {
            throw new NotImplementedException();
        }

        public override string[] GetUsersInRole(string roleName)
        {
            throw new NotImplementedException();
        }

        public override string[] GetAllRoles()
        {
            throw new NotImplementedException();
        }

        public override string[] FindUsersInRole(string roleName, string usernameToMatch)
        {
            throw new NotImplementedException();
        }

        public override string ApplicationName { get; set; }
    }
}

在其中一个视图中调用User.IsInRole("Coach")（该GetRolesForUser方法在 RoleProvider 中调用）。之后，GetRolesForUser在 RoleProvider 的方法中给我一个错误：

你调用的对象是空的。

指向的错误_service.UserRepository.GetAll()，此方法是通过 autofact 注入到 RoleProvider

源错误：

第 31 行：public override string[] GetRolesForUser(string username)

第 32 行：{

第 33 行：var role =（来自 _service.UserRepository.GetAll() 中的 u

第 34 行：在 _service.RoleRepository.GetAll() 中加入 r u.RoleId 等于 r.Id

第 35 行：其中 u.MobileNumber == 用户名

源文件：I:\GBWork\GoldenBody\Web\Utility\Classes\GoldenBodyProvider.cs 行：33

GetAll()GenericRepository 模式中的方法是：

   public virtual List<T> GetAll()
        {
            return _t.AsParallel().ToList();
        }

我认为注射不能正常工作。

自动配置：

 #region Autofac

            var builder = new ContainerBuilder();
            #region Registery
            #region MVC Register
            //This allows you to add properties to your filter attributes and any matching dependencies that are registered in the container will be injected into the properties.
            builder.RegisterFilterProvider();

            // You can register controllers all at once using assembly scanning...
            builder.RegisterControllers(typeof(Global).Assembly);

            builder.RegisterModule<AutofacWebTypesModule>();


            builder.RegisterAssemblyTypes(Assembly.Load("ServiceLayer"))
                .Where(t => t.Name.EndsWith("Service"))
                .AsImplementedInterfaces()
                .InstancePerRequest();
            builder.RegisterType(typeof(GoldenBodyDb)).As(typeof(IUnitOfWork)).InstancePerRequest();
            #endregion
            #region WebApi
            builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); //Register WebApi Controllers
            //زیرا کنتلر های وب ای پی آی در همین اسمبلی می باشد
            #endregion
            #endregion
            var container = builder.Build();

            // Set the dependency resolver for Web API.
            var webApiResolver = new AutofacWebApiDependencyResolver(container);
            GlobalConfiguration.Configuration.DependencyResolver = webApiResolver;

            // Set the dependency resolver for MVC.
            var mvcResolver = new AutofacDependencyResolver(container);
            DependencyResolver.SetResolver(mvcResolver);

            #endregion

我哪里做错了？我的问题在哪里？解决办法是什么？