我正在try 将对象"Week"转换为json.
这就是我用的信号源
class Week{
DateTime _startDate;
DateTime _endDate;
List<Goal> _goalList;
String _improvement;
Week(this._startDate, this._endDate){
this._goalList = List<Goal>();
this._improvement = "";
}
Week.fromJson(Map<String, dynamic> json)
: _startDate = json['startDate'],
_endDate = json['endDate'],
_goalList = json['goalList'],
_improvement = json['improvement'];
Map<String, dynamic> toJson() =>
{
'startDate': _startDate,
'endDate': _endDate,
'goalList': _goalList,
'improvement': _improvement,
};
}
我用了这个:
DateTime startDate = currentDate.subtract(new Duration(days:(weekday-1)));
DateTime endDate = currentDate.add(new Duration(days:(7-weekday)));
Week week = new Week(startDate, endDate);
var json = jsonEncode(week);
但问题是,我得到的结果是:
Unhandled Exception: Converting object to an encodable object failed: Instance of 'Week'
#0 _JsonStringifier.writeObject (dart:convert/json.dart:647:7)
#1 _JsonStringStringifier.printOn (dart:convert/json.dart:834:17)
#2 _JsonStringStringifier.stringify (dart:convert/json.dart:819:5)
#3 JsonEncoder.convert (dart:convert/json.dart:255:30)
#4 JsonCodec.encode (dart:convert/json.dart:166:45)
#5 jsonEncode (dart:convert/json.dart:80:10)