protected void Application_Start()        {            AreaRegistration.RegisterAllAreas();            //当数据库结构改变时，需要将数据库删除再创建            //Database.SetInitializer(new DropCreateDatabaseAlways<BJStoreContext>());            Database.SetInitializer<BJStoreContext>(null);            // 默认情况下对 Entity Framework 使用 LocalDB            Database.DefaultConnectionFactory = new SqlConnectionFactory(@"Data Source=(localdb)\v11.0; Integrated Security=True; MultipleActiveResultSets=True");            RegisterGlobalFilters(GlobalFilters.Filters);            RegisterRoutes(RouteTable.Routes);        }