C＃程序使用秒表冻结以对动作计时 [英] C# program freezes using stopwatch to time an action

问题描述

我有一个控制灯光的Windows窗体程序。这种灯有其自己的类别。我可以做一些事情，例如将其关闭然后更改颜色等。这可以毫无问题地进行。但是，我想做的是使灯点亮特定的时间，即100毫秒或300毫秒（取决于使用情况）。

I have a Windows form program which controls a light. This light has its own class. I can do things like turn it on an off and change the color etc. This I can do without issue. What I want to be able to do, however, is make the light go on for a specific amount of time, i.e. 100 milliseconds or 300 milliseconds (depending on use).

我尝试使用秒表来执行此操作，但是当我单击要执行此操作的按钮时，它将冻结程序。指示灯亮起，然后没有熄灭，并且我不能使用要关闭的停止按钮。

I have tried to used stopwatch to do this, but when I click on the button that is meant to do this, it freezes the program. The light goes on, then doesn't turn off, and I can't use the stop button I have which is meant to turn it off.

程序会加载指示灯，并对其进行初始化，并显示一条警报，指出已完成并检测到一个指示灯。然后我用这个：

The program loads the light, and initialises it, and displays an alert saying it has done this and detected one light. Then I use this:

   private void Red_Click_1(object sender, EventArgs e)
    {
        //Displays Red

        System.Threading.Tasks.Task.Factory.StartNew((Action)delegate()
        {
            displayRedDot();
        });
     }

这是displayRedDot（）

This is the displayRedDot()

public void displayRedDot()
    {

        System.Diagnostics.Stopwatch clock1 = new System.Diagnostics.Stopwatch();
        long elapsedTime = clock1.ElapsedMilliseconds;
        clock1.Start();
        while (elapsedTime < 100)
        {
            oBlynclightController.Display(BlynclightController.Color.Red);
        }
        oBlynclightController.Display(BlynclightController.Color.Off);
        clock1.Stop();


    }

我还有其他一些功能，与此相同，但时间不同，我还未在任何地方调用它，因为我无法使它正常工作。

I have some other functions, which are identical this with a different time, which I haven't invoked anywhere yet because I can't get this to work.

推荐答案

您的代码将永远无法正常工作，因为您正忙于等待来阻塞UI线程。这是您的程序似乎死机的原因。改用计时器或异步/等待

Your code will never work since you are blocking the UI thread by busy waiting. This is the reason for your program seems to freeze. Use a timer or async/await instead

async  void DisplayRedDot(int duration)
{
    oBlynclightController.Display(BlynclightController.Color.Red);
    await Task.Delay(duration);
    oBlynclightController.Display(BlynclightController.Color.Off);
}

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