无法正确重启我的 DispatcherTimer

Question

我正在尝试在我的应用程序中使用三个按钮 - 开始、停止和重新启动来实现计时器。

计时器启动和停止正常。但是，当我单击重新启动按钮时，它从先前的秒和分钟值开始，而不是从 0 和 0 开始。我看不出我在做什么错，因为我在开始时将秒和分钟设置为 0重启方法本身。

例如：第一次从 0 开始，然后继续到 1、2、3。在 3 停止。当我重新启动时，它从 2 开始，继续到 4、6...如果我再次重新启动，它将开始在 3 点继续到 6、9、12...

下面是我的代码：

    public int seconds;
    public int minutes;
    public int hours;

    System.Windows.Threading.DispatcherTimer myTimer = new System.Windows.Threading.DispatcherTimer();

    private void Tick_Timer_Start(object sender, RoutedEventArgs e)
    {
        myTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000);
        myTimer.Tick += new EventHandler(Each_Tick);
        myTimer.Start();
    }

    private void Tick_Timer_Stop(object sender, RoutedEventArgs e)
    {
        myTimer.Stop();
    }

    private void Tick_Timer_Restart(object sender, RoutedEventArgs e)
    {
        seconds = 0;
        minutes = 0;
        Timertext.Text = "0 minutes : 0 seconds";
        myTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000);
        myTimer.Tick += new EventHandler(Each_Tick);
        myTimer.Start();

    }

    private void Each_Tick(object o, EventArgs sender)
    {
        seconds = seconds + 1;

        if (seconds < 10 && minutes < 10)
        {
            Timertext.Text =  minutes.ToString() + " minutes : " + seconds.ToString() + " seconds";
        }
        else if (seconds > 59)
        {
            minutes = minutes + 1;
            seconds = 0;
            seconds = seconds + 1;
            Timertext.Text =  minutes.ToString() + " minutes : " + seconds.ToString() + " seconds";
        }
        else
        {
            Timertext.Text =  minutes.ToString() + " minutes : " + seconds.ToString() + " seconds";
        }
    }

任何帮助将不胜感激。

Answer 1

由于计时器未重置，请执行以下操作：

private void Tick_Timer_Restart(object sender, RoutedEventArgs e)
    {
        myTimer = new System.Windows.Threading.DispatcherTimer();

        seconds = 0;
        minutes = 0;
        Timertext.Text = "0 minutes : 0 seconds";
        myTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000);
        myTimer.Tick += new EventHandler(Each_Tick);
        myTimer.Start();

    }

Answer 2

     // put   myTimer.Stop() in Restart Method

   private void Tick_Timer_Restart(object sender, RoutedEventArgs e)
    {
        myTimer.Stop();  // stop timmer here and try
        seconds = 0;
        minutes = 0;
        Timertext.Text = "0 minutes : 0 seconds";
        myTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000);
        myTimer.Tick += new EventHandler(Each_Tick);
        myTimer.Start();

    }

Answer 3

您的程序永远无法按预期运行！每次单击开始按钮时，您都会向 Dispatchertimer 添加一个 Tickhandler，这样您的秒数就会开始递增 2，然后递增 3，依此类推。您必须在停止和重新启动方法中删除处理程序！！！然后一切都按预期工作，您不必在每次重新启动时创建新的 DispatcherTimer。顺便说一下，@DeshDeep Singh 的解决方案从不收集旧的 DispatcherTimer，因为 EventHandler 阻止它被收集 - 所以他的解决方案给你带来了很大的内存问题。

这是工作代码：

public int seconds;
public int minutes;
public int hours;

System.Windows.Threading.DispatcherTimer myTimer = new System.Windows.Threading.DispatcherTimer();

private void Tick_Timer_Start(object sender, RoutedEventArgs e)
{
    myTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000);
    myTimer.Tick += Each_Tick;
    myTimer.Start();
}

private void Tick_Timer_Stop(object sender, RoutedEventArgs e)
{
    myTimer.Tick -= Each_Tick;
    myTimer.Stop();
}

private void Tick_Timer_Restart(object sender, RoutedEventArgs e)
{
    myTimer.Tick -= Each_Tick;
    seconds = 0;
    minutes = 0;
    Timertext.Text = "0 minutes : 0 seconds";
    myTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000);
    myTimer.Tick += new EventHandler(Each_Tick);
    myTimer.Start();
}

private void Each_Tick(object sender, EventArgs e)
{
    seconds = seconds + 1;
    if (seconds < 10 && minutes < 10)
    {
        Timertext.Text = minutes.ToString() + " minutes : " + seconds.ToString() + " seconds";
    }
    else if (seconds > 59)
    {
        minutes = minutes + 1;
        seconds = 0;
        seconds = seconds + 1;
        Timertext.Text = minutes.ToString() + " minutes : " + seconds.ToString() + " seconds";
    }
    else
    {
        Timertext.Text = minutes.ToString() + " minutes : " + seconds.ToString() + " seconds";
    }
}

Answer 4

您只需附加 Tick 处理程序一次:

private int seconds;
private int minutes;
private int hours;
private DispatcherTimer myTimer = new DispatcherTimer();

private void Initialize()
{
    myTimer.Interval = TimeSpan.FromMilliseconds(1000);
    myTimer.Tick += Each_Tick;
}

private void Tick_Timer_Start(object sender, RoutedEventArgs e)
{
    myTimer.Start();
}

private void Tick_Timer_Stop(object sender, RoutedEventArgs e)
{
    myTimer.Stop();
}

private void Tick_Timer_Restart(object sender, RoutedEventArgs e)
{
    myTimer.Stop();
    seconds = 0;
    minutes = 0;
    Timertext.Text = "0 minutes : 0 seconds";
    myTimer.Start();
}

private void Each_Tick(object o, EventArgs sender)
{
    ...
}

更简单的解决方案是您只需要启动和停止，而无需重新启动：

private int seconds;
private int minutes;
private int hours;
private DispatcherTimer myTimer = new DispatcherTimer();

private void Initialize()
{
    myTimer.Interval = TimeSpan.FromMilliseconds(1000);
    myTimer.Tick += Each_Tick;
}

private void Tick_Timer_Start(object sender, RoutedEventArgs e)
{
    myTimer.Stop();
    seconds = 0;
    minutes = 0;
    Timertext.Text = "0 minutes : 0 seconds";
    myTimer.Start();
}

private void Tick_Timer_Stop(object sender, RoutedEventArgs e)
{
    myTimer.Stop();
}

private void Each_Tick(object o, EventArgs sender)
{
    ...
}

无法正确重启我的 DispatcherTimer

Unable to correctly restart my DispatcherTimer

c#

wpf

dispatchertimer