如何在程序中增加一个定时器轮询？

EasyLanguage中提供Timer（定时器）可以每隔特定的时间执行一次特定的代码，对于某些操作来说，这是一个很有用的工具，如：每30秒检查一次委托中尚未成交的委托并撤单等。

示例1:使用Timer定时检查委托状态

using guosen;
using elsystem;
using tsdata.common; 
using tsdata.marketdata;
using elsystem.collections;

vars:
    Timer timer1(null),
    guosen.OrderTicket otk1(null),
    guosen.Order ord(null),
    string accID("410038122059");//根据情况修改Account ID

method void AnalysisTechnique_Initialized( elsystem.Object sender, elsystem.InitializedEventArgs args ) 
begin
    timer1 = new Timer;
    timer1.Interval = 3000;//Timer的间隔为3000毫秒，也即3秒
    timer1.Elapsed += timer1_Elapsed;
    timer1.Enable = true;

    otk1 = new guosen.OrderTicket;  
    otk1.Symbol = "000002.SZ";
    otk1.Quantity = 100;
    otk1.BypassClientValidation = True;//跳过本地验证
    otk1.Account = accID;
    otk1.Action = OrderAction.Buy;
    otk1.SymbolType = tsdata.common.SecurityType.Stock;
    otk1.Type = tsdata.trading.OrderType.Market;//市价单
    otk1.Duration="AUT";//自动选择期限
    otk1.ExtendedProperties.SetItem("OrderName", "customOrderIDxxxxxxxx");//自定义的OrderName
    ord = otk1.Send();//发送委托

end;

Method void timer1_Elapsed(elsystem.Object sender,elsystem.TimerElapsedEventArgs args)
Begin
    print(DateTime.Now.ToString()+" Timer Elapsed. " + "OrderState:"+ord.State.ToString());
End;

//打印语句输出栏结果示例：
//2016/12/6 15:52:49 Timer Elapsed. OrderState:filled
//2016/12/6 15:52:52 Timer Elapsed. OrderState:filled
//2016/12/6 15:52:55 Timer Elapsed. OrderState:filled
//2016/12/6 15:52:58 Timer Elapsed. OrderState:filled