Question

I have created following class:

       public static class Current
        {
            public static class User
            {
                public static int UserID { get; set; }
                public static string UserName { get; set; }
                public static List<UserRole> Role { get; set; }
            }
            public static class UserRole
            {
                public static int RoleID { get; set; }
                public static string RoleName { get; set; }
            }
       }

But it will gives me an error: in this line

public static List<UserRole> Role { get; set; }

Error 1 ‘Framework.Security.Current.UserRole’: static types cannot be used as type arguments

Answer 1

This has nothing to do with where you’re trying to use the class – it has everything to do with the fact that you can’t use a static class as a type argument. Given that you can’t create an instance of a static class, how could a List<UserRole> ever be useful?

I strongly suspect that those classes shouldn’t be static classes to start with – why on earth would you want them to be?

(It’s also not clear why they should be nested classes, but that’s a different matter.)