Flutter使用Excel库，同样的语句输出不一样

Question

  var _appExcel = Excel.createExcel();

  Excel get appExcel => _appExcel;

  addData() {
    var sheetObject = _appExcel['Sheet1'];
    List<String> dataList = [
      "Google",
      "loves",
      "Flutter",
      "and",
      "Flutter",
      "loves",
      "Google"
    ];
    sheetObject.insertRowIterables(dataList, 0);
    print(sheetObject.rows);
    print(appExcel.sheets);
    print(appExcel.tables['Sheet1']!.rows);

    // appExcel.encode().then((onValue) {
    //   File(join('C:/Users/user/Desktop/hh.xlsx'))
    //     ..createSync(recursive: true)
    //     ..writeAsBytesSync(onValue);
    // });
  }

  saveData(String filePath) {
    print(appExcel.sheets);
    print(appExcel.tables['Sheet1']!.rows);
    appExcel.encode().then((onValue) {
      File(join(filePath))
        ..createSync(recursive: true)
        ..writeAsBytesSync(onValue);
    });
  }