Question

我有一个倒数计时器，运行时它似乎每5-10秒落后1秒。有什么方法可以使该倒数计时器精确到系统时钟时间？

Public MAIN()
            timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromMilliseconds(1000);
            timer.Tick += timer_Tick;


void timer_Tick(object sender, object e)
{
            basetime = basetime - 1;
            txt.Text = string.Format("{0:00}:{1:00}:{2:00}", basetime / 3600, (basetime / 60) % 60, basetime % 60);
            if (basetime == 0)
            {
                timer.Stop();
                Timer_Start.IsEnabled = Timer_Pause.IsEnabled = Timer_Restart.IsEnabled = true;
            }
}

我想尝试一些不同的想法，而且我将不得不暂停并定期启动计时器，因此也必须将其应用于解决方案中。

Answer 1

与其尝试从迭代器中计算时间，不如使用系统时钟来计算时间。

将basetime的类型更改为DateTime。

启动计时器时，请设置基准时间：basetime = DateTime.Now; 并将TimeSpan变量设置为倒数时间：countdown = new TimeSpan(/*your code here*/);

现在像这样更新您的timer_Tick：

void timer_Tick (object sender, object e)
{
    var now = DateTime.Now;

    // This computes the remaining time and formats it for display
    txt.Text = (now - basetime).ToString("hh:mm:ss");

    // Checks that the timer is complete
    if (now - basetime > countdown)
    {
        /* stop the timer */
    }
}

DispatcherTimer并不是十分准确，它是近似值，对于大多数任务来说已经足够了，但是跟踪时间是不够的。相反，您可以使用它大约一秒钟，然后使用系统时钟中的实际时间更新计时器。

Answer 2

解决方案；

运行秒表并将其与数学进行比较。

P.S。我知道有更好的方法可以这样做，并且可能会在将来的版本中更新。


        void Timer_Tick(object sender, object e)
         {
            int BaseINMill = basetime * 1000;
            //total of milliseconds left
            basetimeMILL.Text = BaseINMill.ToString() ;
            //Display the total Milliseconds elapsed
            ConsolePost.Text = VerifyMill.ElapsedMilliseconds.ToString();


            if( CorrectionWatch.ElapsedMilliseconds >= 2000)
            {
                PreCorrBaseTime = PreCorrBaseTime - 2;

                //Display the Correction timer Milliseconds elapsed
                Correctiontest.Text = CorrectionWatch.ElapsedMilliseconds.ToString();
                CorrectionWatch.Restart();
                //Show the total time between seconds changing on screen
                ConsoleOutputPre.Text = stopwatch.ElapsedMilliseconds.ToString();
                basetime = PreCorrBaseTime;
                txt.Text = string.Format("{0:00}:{1:00}:{2:00}", basetime / 3600, (basetime / 60) % 60, basetime % 60);
                if (basetime == 0)
                {
                    timer.Stop();
                    Timer_Start.IsEnabled = Timer_Pause.IsEnabled = Timer_Restart.IsEnabled = true;
                    VerifyMill.Stop();
                }
                stopwatch = Stopwatch.StartNew();
            }
            else {
                if (stopwatch.ElapsedMilliseconds >= 975 && stopwatch.ElapsedMilliseconds <=1025 )
                {
                    //Show the total time between seconds changing on screen
                    ConsoleOutputPre.Text = stopwatch.ElapsedMilliseconds.ToString();
                    basetime = basetime - 1;
                    txt.Text = string.Format("{0:00}:{1:00}:{2:00}", basetime / 3600, (basetime / 60) % 60, basetime % 60);
                    if (basetime == 0)
                    {
                        timer.Stop();
                        Timer_Start.IsEnabled = Timer_Pause.IsEnabled = Timer_Restart.IsEnabled = true;
                        VerifyMill.Stop();
                    }
                    stopwatch = Stopwatch.StartNew();
                }

                if (stopwatch.ElapsedMilliseconds >= 1026 && stopwatch.ElapsedMilliseconds <= 2000)
                {
                    //Show the total time between seconds changing on screen
                    ConsoleOutputPre.Text = stopwatch.ElapsedMilliseconds.ToString();
                    basetime = basetime - 1;
                    txt.Text = string.Format("{0:00}:{1:00}:{2:00}", basetime / 3600, (basetime / 60) % 60, basetime % 60);
                    if (basetime == 0)
                    {
                        timer.Stop();
                        Timer_Start.IsEnabled = Timer_Pause.IsEnabled = Timer_Restart.IsEnabled = true;
                        VerifyMill.Stop();
                    }
                    stopwatch = Stopwatch.StartNew();
                }
                if (stopwatch.ElapsedMilliseconds > 2000)
                {
                    ErrorPrompt();
                    VerifyMill.Stop();
                }
            }


        }

C＃倒数计时器，没有准确性。寻找不同的方式来做到这一点

2 个答案: