在BlocBuilder中初始化类作为模型并获取错误

在我的应用程序中,我有如下结构的模型,我想在内部初始化它 BlocBuilder Text() ,例如:

class _Login extends State<Login> {
  UserInfo _userInfo = UserInfo();

  LoginListingBloc loginListingBloc;

  @override
  void initState() {
    loginListingBloc = BlocProvider.of<LoginListingBloc>(context);
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: BlocBuilder(
        bloc: loginListingBloc,
        builder: (BuildContext context, LoginListingStates state) {
          if (state is LoginUninitializedState) {
          } else if (state is LoginFetchedState) {
            _userInfo = state.userInfo;

            print(_userInfo.name);
          }
          return Text("My Username from server is: $_userInfo.name");
        },
      ),
    );
  }
}

我不想做一些变量,比如 name email 或 avatart 把它们填满 BlocBuilder公司 使用它们,因为我有这个类模型,我想我可以在内部初始化 BlocBuilder公司 利用这个,

生成时引发了以下ArgumentError BlocBuilder(脏, 依赖项:[MediaQuery],状态:

LoginListingStates 课程内容:

abstract class LoginListingStates {}

class LoginUninitializedState extends LoginListingStates {}

class LoginFetchingState extends LoginListingStates {}

class LoginFetchedState extends LoginListingStates {
  final UserInfo userInfo;

  LoginFetchedState({this.userInfo}) : assert(userInfo != null);
}

class LoginErrorState extends LoginListingStates {}

还有我的 UserInfo

class UserInfo {
  String _name;
  String _email;
  String _avatar;

  UserInfo();

  UserInfo.fromJson(Map<String, dynamic> json)
      : _name = json["name"],
        _email = json["email"],
        _avatar = json["avatar"],

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['name'] = _name;
    data['email'] = _email;
    data['avatar'] = _avatar;
    return data;
  }

  String get email => _email;

  String get name => _name;

  int get avatar=> _avatar;
}