C＃将属性添加到对象列表

Question

我有一个对象列表：class DisplayTransactions extends StatefulWidget { final TransactionType tmptransType; final FinanceTransBlock transacBloc; final Function onSelectionChanged; int SelectedItemsCount; /// -1 expense 1 income DisplayTransactions( {Key key, @required this.tmptransType, @required this.transacBloc, this.SelectedItemsCount, this.onSelectionChanged}) : super(key: key); @override _DisplayTransactionsState createState() => _DisplayTransactionsState(); } class _DisplayTransactionsState extends State<DisplayTransactions> { var isSelected = false; var mycolor = Colors.white; // int iselectionCount = 0; @override Widget build(BuildContext context) { widget.transacBloc.transacType = widget.tmptransType; debugPrint("----------------------------- ${widget.tmptransType}"); if (widget.SelectedItemsCount == 0) {// if no rows selected, then reload database based on trans type, eg expense, or income.. etc widget.transacBloc.refresh(); } return StreamBuilder<List<FinanceTransaction>>( stream: widget.transacBloc.transacations, builder: (context, snapshot) { if (snapshot.hasData) { List<FinanceTransaction> list = snapshot.data; // return buildTaskListWal(snapshot.data); return Padding(

我尝试通过网络套接字发送此列表，但我缺少的是一个{ "name":"John", "birth":"1986-12-14", "city":"New York"}属性，它看起来像是：

"msg_code"

如何将msg_code附加到对象列表？

{ "msg_code": "ListUsers", "name":"John", "birth":"1986-12-14", "city":"New York"}

编辑：

尝试将msg_code属性赋予用户列表：

            var users = LoadUsers(); // List of Users ({ "name":"John", "birth":"1986-12-14", "city":"New York"}) etc..
            string output = new JavaScriptSerializer().Serialize(users);
            session.Send(output);

Answer 1

要插入新对象，只需将对象的键和值传递给它。示例：

let myObj = { "name":"John", "birth":"1986-12-14", "city":"New York"}

console.log(myObj)

myObj['msg_code'] = 'listUsers'

console.log(myObj)