如何在flutter中访问ModelName / ProviderName的数据表单实例

dependencies:
  flutter:
    sdk: flutter
  provider: ^5.0.0

class ModelName {
  String name;
  int age;

  ModelName({required this.name, required this.age});
}

import 'package:flutter/material.dart';

class ProviderName extends ChangeNotifier {
  ModelName _modelName = ModelName(name: '', age: 0);

  ModelName get modelName => _modelName;

  void updateModelName(String name, int age) {
    _modelName = ModelName(name: name, age: age);
    notifyListeners();
  }
}

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

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final provider = Provider.of<ProviderName>(context);
    final modelName = provider.modelName;

    return Text('Name: ${modelName.name}, Age: ${modelName.age}');
  }
}

class MyButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final provider = Provider.of<ProviderName>(context);

    return ElevatedButton(
      onPressed: () {
        provider.updateModelName('John', 25);
      },
      child: Text('Update Data'),
    );
  }
}