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我正在使用 flutter Retrofit 包，尝试将数据上传到服务器（Laravel）。基本上，文件应作为 MultiPart 部分注释发送。另外，我应该与文件（在我的例子中是图片）一起发送不同的值，所以我使用了@Part()map<String,dynamic>。

这是我的代码

@POST('register')
  Future<RegisterResponse> register(@Body() Map<String, dynamic> body, @Part() File pic);

这是我的要求

Map<String, dynamic> body = {
                            "name":" widget.fullName",
                            "username": "widget.userName",
                            "phone": "698281556",
                            "country_code": "+213",
                            "email": "widget.email@gmail.com",
                            "birth_date": "18-09-2021",
                            "pic": imageFile,
                            "lat": 36.347285,
                            "lon": 6.603381,
                            "address": "widget.userName",
                            "city": "widget.userName",
                            "residential": "widget.userName",
                            "device_token": "widget.userName",
                            "code": "123456",
                            "tags": [1,2]
                          };

                          final logger = Logger();
                          final dio = Dio(); // Provide a dio instance
                          dio.options.headers["Content-Type"] =
                          "multipart/form-data";
                          dio.options.headers["X-Requested-With"] =
                          "XMLHttpRequest";
                          final client = RestClient(dio);

                          client.register(body,imageFile!).then((it) async {

                            print(it.access_token); …