您需要解开的事件前再次钩住这样的 -

 私人无效poc_MouseMove（对象发件人，发送MouseEventArgs E）
{
   如果（定时器！= NULL）
   {
      timer.Tick- = timer_Tick;
   }
   定时器=新DispatcherTimer（）;
   timer.Interval =新时间跨度（0,0，5）;
   timer.Tick + =新的EventHandler（timer_Tick）;
   timer.Start（）;
}
 

说明

每当鼠标移动时，将创建DispatcherTimer的新实例，并挂钩Tick事件而不用担心会有脱钩的事件previous实例什么，你做的是。因此，你看到洪水淹没的消息后，计时器停止所有实例。

此外，你应该解开它，否则previous实例不会被垃圾回收，因为他们仍然坚决引用。

I am writing a WPF application. I want to trigger an event once the mouse stops moving.

This is how I tried to do it. I created a timer which counts down to 5 seconds. This timer is "reset" every time the mouse moves. This idea is that the moment the mouse stops moving, the timer stops being reset, and counts down from 5 to zero, and then calls the tick event handler, which displays a message box.

Well, it doesn't work as expected, and it floods me with alert messages. What am I doing wrong?

DispatcherTimer timer;

private void Window_MouseMove(object sender, MouseEventArgs e)
{
    timer = new DispatcherTimer();
    timer.Interval = new TimeSpan(0, 0, 5);
    timer.Tick += new EventHandler(timer_Tick);
    timer.Start();
}

void timer_Tick(object sender, EventArgs e)
{
    MessageBox.Show("Mouse stopped moving");
}

You need to unhook the event before hooking it again like this -

private void poc_MouseMove(object sender, MouseEventArgs e)
{
   if (timer != null)
   {
      timer.Tick-= timer_Tick;
   }
   timer = new DispatcherTimer();
   timer.Interval = new TimeSpan(0, 0, 5);
   timer.Tick += new EventHandler(timer_Tick);
   timer.Start();
}

Explanation

What you doing is whenever a mouse moves, you create a new instance of DispatcherTimer and hook Tick event to it without unhooking the event for previous instance. Hence, you see flooded messages once timer stops for all the instances.

Also, you should unhook it otherwise previous instance won't be garbage collected since they are still strongly referenced.