Unity.mvc5-正在注册会话对象

我有一个ISessionState接口

public interface ISessionState
{
    void Clear();
    void Delete(string key);
    object Get(string key);
    T Get<T>(string key) where T : class;
    ISessionState Store(string key, object value);
}

和SessionState类：

public class SessionState : ISessionState
{
    private readonly HttpSessionStateBase _session;
    public SessionState(HttpSessionStateBase session)
    {
        _session = session;
    }
    public void Clear()
    {
        _session.RemoveAll();
    }
    public void Delete(string key)
    {
        _session.Remove(key);
    }
    public object Get(string key)
    {
        return _session[key];
    }
    public T Get<T>(string key) where T : class
    {
        return _session[key] as T;
    }
    public ISessionState Store(string key, object value)
    {
        _session[key] = value;
        return this;
    }
}

a BaseController类：

public class BaseController : Controller
{
    private readonly ISessionState _sessionState;
    protected BaseController(ISessionState sessionState)
    {
        _sessionState = sessionState;
    }
    internal protected ISessionState SessionState
    {
        get { return _sessionState; }
    }
}

和用户控制器：

public class UserController : BaseController
{
    public UserController(ISessionState sessionState) : base(sessionState) { }
    public ActionResult Index()
    {
        // clear the session and add some data
        SessionState.Clear();
        SessionState.Store("key", "some value");
        return View();
    }
}

我使用Unity进行依赖项注入。本次注册：

container.RegisterType<ISessionState, SessionState>();

或

container.RegisterType<ISessionState, SessionState>(new InjectionConstructor(new ResolvedParameter<HttpSessionStateBase>("session")));

结果：当前类型System.Web.HttpSessionStateBase是一个抽象类，无法构造。您是否缺少类型映射？

在unity.mvc5注册的正确解决方案是什么？

container.RegisterType<HttpSessionStateBase>(
    new InjectionFactory(x =>
        new HttpSessionStateWrapper(System.Web.HttpContext.Current.Session)));