更新开发环境后Flutter项目出现RequestOptions无法赋值给Options参数的问题求助

Hey there, I've run into this exact issue with Dio 4.x before—let's get you sorted out quickly!

The Problem #

The error is straightforward: in Dio 4.0.0, the options parameter of dio.get() expects an Options instance, but you're passing a RequestOptions instead. Even though they live in the same file, these are distinct types in Dio's API design:

• Options is the public-facing class you should use to configure requests.
• RequestOptions is mostly for internal Dio use, to encapsulate fully resolved request details after processing.

The Fix #

Simply replace RequestOptions with Options in your code. All the properties you're setting (method, headers, extra, baseUrl) are supported by Options:

Future<List<dynamic>> getUserAllGames() async {
  const _extra = <String, dynamic>{};
  SharedPreferences pref = await SharedPreferences.getInstance();
  Map<String, String> headers = {
    HttpHeaders.contentTypeHeader: "application/json",
    HttpHeaders.authorizationHeader: "Bearer ${pref.getString("token")}",
  };
  
  // Swap RequestOptions for Options here
  final response = await _dio.get('game/all', options: Options(
      method: 'GET',
      headers: headers,
      extra: _extra,
      baseUrl: baseUrl) );
  
  print(response);
  return response.data;
}

Bonus: Cleaner Code #

Since you're using a GET request (which is the default for dio.get()), you can even omit the method: 'GET' parameter. Plus, Dio's get() method accepts headers, extra, and baseUrl directly as top-level parameters, so you can simplify further:

Future<List<dynamic>> getUserAllGames() async {
  const _extra = <String, dynamic>{};
  SharedPreferences pref = await SharedPreferences.getInstance();
  Map<String, String> headers = {
    HttpHeaders.contentTypeHeader: "application/json",
    HttpHeaders.authorizationHeader: "Bearer ${pref.getString("token")}",
  };
  
  // No need to wrap in Options at all!
  final response = await _dio.get(
    'game/all',
    headers: headers,
    extra: _extra,
    baseUrl: baseUrl,
  );
  
  print(response);
  return response.data;
}

This should resolve the type mismatch error and get your request working as expected.

内容的提问来源于stack exchange，提问作者Rich