背景:我有一个计时器,用于跟踪自触发serialPort DataReceived事件以来已经过了多长时间。我正在为此创建自己的解决方案,而不是使用内置超时事件,因为我正在获取连续的数据流,而不是发送查询并获得一个响应。
问题:
在DataReceived处理程序中,我有一条语句停止计时器,这样就不会过去了。问题在于,很多时候它仍然执行Elapsed处理程序后缀。
我已经读过可以使用SynchronizingObject解决此问题,但是我不确定如何实现。
这是我的代码:我试图删掉我认为不相关的所有内容。
private System.Timers.Timer timeOut;
private System.Timers.Timer updateTimer;
public void start()
{
thread1 = new Thread(() => record());
thread1.Start();
}
public void requestStop()
{
this.stop = true;
this.WaitEventTest.Set();
}
private void record()
{
timeOut = new System.Timers.Timer(500); //** .5 Sec
updateTimer = new System.Timers.Timer(500); //** .5 Sec
timeOut.Elapsed += TimeOut_Elapsed;
updateTimer.Elapsed += updateTimer_Elapsed;
updateTimer.AutoReset = true;
comport.Open();
comport.DiscardInBuffer();
comport.Write(COMMAND_CONTINUOUSMODE + "\r");
stopwatch.Reset();
stopwatch.Start();
recordingStartTrigger(); //** Fire Recording Started Event
timeOut.Start();
updateTimer.Start();
this.waitHandleTest.WaitOne(); //** wait for test to end
timeOut.Stop();
updateTimer.Stop();
comport.Write(COMMAND_COMMANDMODE + Environment.NewLine);
comport.DiscardInBuffer();
comport.Close();
recordingStopTrigger(status); //** Fire Recording Stopped Event
stopwatch.Stop();
}
//***********************************************************************************
//** Events Handlers
private void comDataReceived_Handler(object sender, SerialDataReceivedEventArgs e)
{
double force = -100000;
string temp = "-100000";
//timeOut.SynchronizingObject.Invoke(new Action(()=> {timeOut.Stop();}), new object[] {sender, e});
timeOut.Stop();
//** I removed my action code here, keep things simple.
timeOut.Start();
}
private void TimeOut_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
timeOut.Stop();
updateTimer.Stop();
//** fire delegate that GUI will be listening to, to update graph.
if (eventComTimeOut != null && this.stop == false)
{
if (eventComTimeOut(this, new eventArgsComTimeOut(comport.PortName, "READ")))
{
//retry = true;
comport.Write(COMMAND_CONTINUOUSMODE + "\r");
updateTimer.Start();
timeOut.Start();
}
else
{
this.stop = true;
//retry = false;
this.WaitEventTest.Set();
status = eventArgsStopped.Status.failed;
}
}
}
void updateTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
//** fire delegate that GUI will be listening to, to update graph.
List<Reading> temp = new List<Reading>(report.Readings_Force);
eventNewData(this, new eventArgsNewData(temp));
}
最佳答案
这是众所周知的行为。 System.Timers.Timer
在内部使用ThreadPool
执行。运行时将在线程池中将Timer
排队。在调用Stop
方法之前,它已经排队。它将在经过的时间触发。
为了避免这种情况的发生,请将Timer.AutoReset
设置为false,如果需要的话,在经过的处理程序中重新启动计时器。将AutoReset
设置为false会使计时器仅触发一次,因此为了使计时器按间隔触发,请再次手动启动计时器。
yourTimer.AutoReset = false;
private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
try
{
// add your logic here
}
finally
{
yourTimer.Enabled = true;// or yourTimer.Start();
}
}