WinForms中的多线程stopWatch计时器

Question

我想每10毫秒运行一次定时器，并更新GUI标签字符串。我已经创建了类TimerController，如果我可以设置System.Threading.Timer属性的话。

class TimerControl
{
private Timer _timer;
public DateTime StartTime { get; private set; }
public TimeSpan CurrentElapsedTime { get; private set; }
public TimeSpan TotalElapsedTime { get; private set; }
public event EventHandler Tick;
public bool IsTimerRunning { get; private set; }
public string CurrentElapsedTimeString { get; private set; } = "";
public TimerCallback TimerAction { get; private set; }
public object TimerParametr { get; private set; }
public int DueTime { get; private set; }
public int Period { get; private set; }
public TimerControl(TimerCallback timerAction, object state, int dueTime, int period)
{
StartTime = DateTime.Now;
CurrentElapsedTime = TimeSpan.Zero;
TotalElapsedTime = TimeSpan.Zero;
TimerAction = timerAction;
TimerParametr = state;
DueTime = dueTime;
Period = period;

}

public void StartTimer()
{
StartTime = DateTime.Now;
TotalElapsedTime = CurrentElapsedTime;
IsTimerRunning = true;
if (_timer == null)
_timer = new Timer(TimerAction, TimerParametr, DueTime, Period);
else
_timer.Change(DueTime, Period);
}
public void StopTimer()
{
_timer.Change(0, -1);
}

我在MainForm.cs中创建了TimerControl对象，我需要创建一个由计时器触发的函数。此功能应更新GUI时间标签。但在这个功能中，我无法访问GUI。如何修复？

TimerControl timerControl = new TimerControl(StopWatchTimer,null, 0, 10); 

public MainForm()
{
InitializeComponent();
}

private void btn_timerStart_Click(object sender, EventArgs e)
{
if(btn_timerStart.Text == "Старт")
{
timerControl.StartTimer();
btn_timerStart.Text = "Стоп";
}
else
{
timerControl.StopTimer();
btn_timerStart.Text = "Старт";


}
}
// Callback timer funnction
private static void StopWatchTimer(object label)
{

//labelTime =       // labelTime doesnt exist in current context
}
}

}

Answer 1

我就是这么做的，一切都很好。

public partial class MainForm : Form
{
TimerControl timerControl;
public MainForm()
{
InitializeComponent();
timerControl = new TimerControl(StopWatchTimer, l_timer, 0, 10);
}
private void btn_timerStart_Click(object sender, EventArgs e)
{
if(btn_timerStart.Text == "Старт")
{
timerControl.StartTimer();
btn_timerStart.Text = "Стоп";
}
else
{
timerControl.StopTimer();
btn_timerStart.Text = "Старт";


}
}
private  void StopWatchTimer(object label)
{
Label timeLabel = (Label)label;
TimeSpan elapsed = DateTime.Now - timerControl.StartTime;
this.Invoke(new MethodInvoker(delegate ()
{
timeLabel.Text = elapsed.ToString(@"ss.ff");
}));
}
}

在此处输入图像描述