Flutter Dart 中从 netcore 服务器 api 的 List<Object> 转换

Question

我正在尝试将对象列表（Flutter 中的List<Object>）转换为 Flutter 项目中定义的类型（类）。我已经尝试过转换列表的示例，如 Serializing Your Object in Flutter 所示。每次我得到Map<String, dynamic> 都不是List<dynamic> 的子类型。但是尝试了一些不同的，同样的错误。发布的是后者的示例代码，而不是来自Serializing Your Object in Flutter。有没有其他方法可以实现这一目标？非常感谢您的回复。 [更新]

自定义对象

@JsonSerializable(explicitToJson: true)
class Activity{
  String id;
  String name;
  double amount;

  Activity({ this.amount, this.name , this.id});  

  Activity.fromJson(Map<String, dynamic> json){ 
      id = json["id"];
      name = json["name"];
      amount = json["amount"];
  }
  Map<String, dynamic> toJson() => {      
      'id' : id,
      'name' : name,
      'amount' : amount,
  };
}

颤振屏幕示例

initiateConnection(){
    var builder = HubConnectionBuilder();
    this._hubConnection = builder.withUrl("##########################").build();

    _hubConnection.onclose( (error) => print("Connection Closed"));

    this._hubConnection.on("Activities", formActivityDashboard );

    this._hubConnection.start().then((data) => print("Connected"));
  }

  formActivityDashboard(List<Object> data){
    final items = (data).map((i) => new Activity.fromJson(i));
    for (final item in items) {
      print(item.id);
    }
  }

Answer 1

List<dynamic>ActivityList=json.decode(response.body);
List<Activity> myActivityList = new List();

      for(int i=0;i<ActivityList.length;i++)
      {
        Map<String, dynamic>ActivityData = ActivityList.elementAt(i);
        Activity act=new Activity();
        act.id=ActivityData['id']
        act.name=ActivityData['name']
        act.amount=ActivityData['amount']

        myActivityList.add(act);
      }