如何在flutter和blocks管理中使用file_picker包？https://pub.dev/packages/file_picker
我有以下代码：

class NewAuction extends StatelessWidget {   
  late final FilePickerResult? filePickerResults;      

  final _formKey = GlobalKey<FormState>();   
  final _priceController = TextEditingController();   
  final _descriptionController = TextEditingController();   
  final _titleController = TextEditingController();

  NewAuction({Key? key, this.filePickerResults}) : super(key: key);

  @override   Widget build(BuildContext context) {
    return Scaffold(
                      ...
                            child: SizedBox(
                              width: double.infinity,
                              height: 48,
                              child: ElevatedButton.icon(
                                icon: const Icon(
                                  Icons.camera_alt,
                                  color: Colors.white,
                                ),
                                style: ButtonStyle(
                                  shape: MaterialStateProperty.all<
                                      RoundedRectangleBorder>(
                                    RoundedRectangleBorder(
                                      borderRadius: BorderRadius.circular(32),
                                      side: const BorderSide(
                                          color: Colors.deepPurple),
                                    ),
                                  ),
                                ),
                                label: const Text(
                                  'Upload images',
                                  style: TextStyle(
                                      color: Colors.white,
                                      fontSize: 20,
                                      fontWeight: FontWeight.w400),
                                ),
                                onPressed: () async {
                                  final results =
                                      await FilePicker.platform.pickFiles(
                                    allowMultiple: true,
                                    type: FileType.image,
                                  );

    THROWS ERROR WHEN ASSIGNING   if (results != null) {
   -------------------------->      filePickerResults = results;
                                  }

                                  if (results == null) {
                                    ScaffoldMessenger.of(context)
                                        .showSnackBar(const SnackBar(
                                      content: Text('No files selected'),
                                    ));
                                    return;
                                  }
                                  if (results.paths.length > 5) {
                                    ScaffoldMessenger.of(context)
                                        .showSnackBar(const SnackBar(
                                      content: Text('Maximum 5 files allowed'),
                                    ));
                                    return;
                                  }
                                },
                              ),
                            ),
                          ),
                          ...
                                Expanded(
                                  child: Padding(
                                    padding: const EdgeInsets.only(left: 8),
                                    child: SizedBox(
                                      width: double.infinity,
                                      height: 48,
                                      child: ElevatedButton.icon(
                                        icon: const Icon(
                                          Icons.post_add,
                                          color: Colors.white,
                                        ),
                                        style: ButtonStyle(
                                          shape: MaterialStateProperty.all<
                                              RoundedRectangleBorder>(
                                            RoundedRectangleBorder(
                                              borderRadius:
                                                  BorderRadius.circular(32),
                                              side: const BorderSide(
                                                  color: Colors.deepPurple),
                                            ),
                                          ),
                                        ),
                                        label: const Text(
                                          'Post',
                                          style: TextStyle(
                                              color: Colors.white,
                                              fontSize: 20,
                                              fontWeight: FontWeight.w400),
                                        ),
                                        onPressed: () async {
                                          if (_formKey.currentState!
                                              .validate()) {
                                            context.read<AuctionBloc>().add(
                                                PostNewAuctionEvent(
                                                    _titleController.text,
                                                    double.parse(
                                                        _priceController.text),
                                                    _descriptionController.text,
           ------------------------->               filePickerResults));
                                          }
                                        },
                                      ),
                        ...
            );
          }
          return Container();
        },
      ),
    );   } }

当分配最后的final时，会抛出一个LateError._throwFieldAlreadyInitialized。我如何将我的filepicker结果传递到我的块？
这种情况下的最佳实践是什么？
从我的构造函数中删除filepickerResults，使它只有在初始化时才能工作，但情况并不总是这样...
谢谢