如何在Flutter中的对话框中访问提供程序

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class MyDataProvider extends ChangeNotifier {
  String data = 'Hello World';

  void updateData(String newData) {
    data = newData;
    notifyListeners();
  }
}

void main() {
  runApp(
    ChangeNotifierProvider(
      create: (context) => MyDataProvider(),
      child: MyApp(),
    ),
  );
}

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class MyDialog extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final myDataProvider = Provider.of<MyDataProvider>(context);

    return AlertDialog(
      title: Text('Dialog Title'),
      content: Text(myDataProvider.data),
      actions: [
        FlatButton(
          child: Text('Update Data'),
          onPressed: () {
            myDataProvider.updateData('New Data');
            Navigator.of(context).pop();
          },
        ),
      ],
    );
  }
}