在flutter应用程序中创建StreamProvider需要纠正

Question

我正在学习关于StreamProviders和ChangeNotifierProvider以及如何在flutter应用程序中使用它们。

我遇到的问题是当我在main.dart中创建StreamProvider时。我得到了这个错误不能使用静态访问访问实例成员'getAgencyTrxn'。(文档)由getAgencyTrxn()下的红线指定。我一直在遵循一个教程，也有一些帖子在这里，但没有一个完全匹配我正在做的。

如何修复此错误?

到目前为止我写的是:

main.dart

Widget build(BuildContext context) {
Provider.debugCheckInvalidValueType = null;
globals.newTrxn = true;
return MultiProvider(
providers: [
ChangeNotifierProvider<TrxnProvider>(create: (context) => TrxnProvider()),
StreamProvider<TrxnProvider>(
create: (context) => TrxnProvider.getAgencyTrxn(),
initialData: []),
],
child: MaterialApp(
debugShowCheckedModeBanner: false,
home: LoginScreen(),
),
);
}

trxn_provider.dart

class TrxnProvider extends ChangeNotifier {
final firestoreService = FirestoreService();
String? _clientFName;
String? _clientLName;
// Getters
String? get clientFName => _clientFName;
String? get clientLName => _clientLName;
// Setters
changeclientFName(String value) {
_clientFName = value;
notifyListeners();
}
changeclientLName(String value) {
_clientLName = value;
notifyListeners();
}
loadValues(QueryDocumentSnapshot trxns) {
_clientFName = trxns['clientFName'];
_clientLName = trxns['clientLName'];
}
getAgencyTrxn() {
return firestoreService.getAgencyTrxns();
}
saveTrxn() {
if (globals.newTrxn == true) {
_trxnId = uuId.v4();
globals.newTrxn = false;
}
var newTrxn = Trxns(
clientFName: clientFName,
clientLName: clientLName);
firestoreService.saveTrxn(newTrxn);
}
deleteTrxn(String trxnId) {
firestoreService.deleteTrxn(trxnId);
}
}

firestore_service.dart

class FirestoreService {
FirebaseFirestore _db = FirebaseFirestore.instance;
Stream<QuerySnapshot> getAgencyTrxns() async* {
yield* FirebaseFirestore.instance
.collection('agency').doc(globals.agencyId)
.collection('trxns')
.where('trxnStatus', isNotEqualTo: 'Closed')
.snapshots();
}
}

Answer 1

我找到了解决方案。我需要改变这个

create: (context) => TrxnProvider.getAgencyTrxn()

create: (context) => TrxnProvider().getAgencyTrxn()