flutter getx show dropdown using Provider，Repository，MVC

dependencies:
  flutter:
    sdk: flutter
  provider: ^6.0.0

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

class DropdownWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return DropdownButton<String>(
      value: Provider.of<String>(context),
      onChanged: (newValue) {
        Provider.of<String>(context, listen: false).updateValue(newValue);
      },
      items: Provider.of<String>(context).options.map((String value) {
        return DropdownMenuItem<String>(
          value: value,
          child: Text(value),
        );
      }).toList(),
    );
  }
}

class DropdownRepository {
  List<String> getOptions() {
    // 从网络或本地数据库获取下拉菜单的选项列表
    return ['Option 1', 'Option 2', 'Option 3'];
  }
}

class DropdownWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final repository = DropdownRepository();
    final options = repository.getOptions();

    return DropdownButton<String>(
      // ...
      items: options.map((String value) {
        // ...
      }).toList(),
    );
  }
}

class DropdownModel {
  List<String> options;
  String selectedOption;

  DropdownModel(this.options, this.selectedOption);

  void updateValue(String newValue) {
    selectedOption = newValue;
  }
}

class DropdownWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final model = DropdownModel(['Option 1', 'Option 2', 'Option 3'], 'Option 1');

    return DropdownButton<String>(
      value: model.selectedOption,
      onChanged: (newValue) {
        model.updateValue(newValue);
      },
      items: model.options.map((String value) {
        return DropdownMenuItem<String>(
          value: value,
          child: Text(value),
        );
      }).toList(),
    );
  }
}