CurrentUser.cs

    public class CurrentUser : ICurrentUser {
        private readonly IIdentity _identity;
        private readonly HttpSessionStateBase _session;
        private readonly UserInfoService _service;

        private IUserInfo _user;

        public CurrentUser(IIdentity identity, HttpSessionStateBase session,  UserInfoService service) {
            _identity = identity;
            _session = session;
            _service = service;
        }

        public IUserInfo User {
            get {
                if (_user != null) return _user;
                
                _user = _session["UserInfo"] as IUserInfo;

                if (_user != null) return _user;

                _user = _identity != null && !string.IsNullOrEmpty(_identity.Name)
                    ? _service.GetUserByName(_identity.Name)
                    : null;
                
                _session["UserInfo"] = _user;

                return _user;
            }
        }
    }