计时器来触发一个事件WPF [英] Timer to fire an event WPF

问题描述

我有一个项目，在这里，它已默认设置的动作发生由MouseEnter事件。我的意思是，打开一个窗口，关闭，返回，一切，只发生了MouseEnter事件。

I have a project here and it has set by default that the actions occur by MouseEnter event. I mean, opening a Window, closing, returning, whatever, happens only by the MouseEnter event.

我被要求只有3秒后，使该事件火灾。这意味着，用户将将鼠标上的控制，仅在3秒后的事件必须发生在窗口中的所有控制。

I was requested to make the event fire only after 3 seconds. That means that the user will place the mouse on the control and only after 3 seconds the event must happen for all the controls in the window.

于是，我想到了一个全球性的定时器或相似的东西，这将返回false，直到计时器达到3 ...我认为，就是这样......

So, I thought about a global timer or something alike, that will return false untill the timer reaches 3... I think that's the way...

吉兹，没有任何人知道我怎么能做出这样的事？

Geez, does anybody knows how can I make such thing?

谢谢！

推荐答案

您可以定义一个类，将暴露一个 DelayedExecute 方法接收执行操作，并创建定时器根据需要，用于将延迟执行。它看起来是这样的：

You can define a class that will expose a DelayedExecute method that receives an action to execute and creates timers as needed for the delayed execution. It would look something like this:

public static class DelayedExecutionService
{
    // We keep a static list of timers because if we only declare the timers
    // in the scope of the method, they might be garbage collected prematurely.
    private static IList<DispatcherTimer> timers = new List<DispatcherTimer>();

    public static void DelayedExecute(Action action, int delay = 3)
    {
        var dispatcherTimer = new System.Windows.Threading.DispatcherTimer();

        // Add the timer to the list to avoid it being garbage collected
        // after we exit the scope of the method.
        timers.Add(dispatcherTimer);

        EventHandler handler = null;
        handler = (sender, e) =>
        {
            // Stop the timer so it won't keep executing every X seconds
            // and also avoid keeping the handler in memory.
            dispatcherTimer.Tick -= handler;
            dispatcherTimer.Stop();

            // The timer is no longer used and shouldn't be kept in memory.
            timers.Remove(dispatcherTimer);

            // Perform the action.
            action();
        };

        dispatcherTimer.Tick += handler;
        dispatcherTimer.Interval = TimeSpan.FromSeconds(delay);
        dispatcherTimer.Start();
    }
}

然后，你可以这样调用它：

Then you can call it like this:

DelayedExecutionService.DelayedExecute(() => MessageBox.Show("Hello!"));

或

DelayedExecutionService.DelayedExecute(() => 
{
    DoSomething();
    DoSomethingElse();
});

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