关于计时器和可变间隔的问题

发布于 2024-09-06 01:29:58 字数 816 浏览 1 评论 0原文

这个计时器的目的是在午夜时执行一些代码。所以基本上，第一个间隔将是从现在到午夜之间，之后的所有间隔都是 24 小时。

现在一切都很好，但我想知道这个计时器业务是如何运作的。每次计时器重置时，MyTimer.Interval 是否都会重新计算？

System.Timers.Timer MyTimer = new System.Timers.Timer();
MyTimer.Elapsed += new ElapsedEventHandler(TriggeredMethod);
MyTimer.Interval = [pseudocode]Time between now and midnight[/pseudocode];
MyTimer.Start();

编辑：

我在设置 TriggerMethod 内部的时间间隔时遇到问题。我应该在哪里/如何启动计时器，这样我就不会收到任何上下文错误？

private void Form1_Load(object sender, EventArgs e)
{
System.Timers.Timer MyTimer = new System.Timers.Timer();
MyTimer.Elapsed += new ElapsedEventHandler(TriggeredMethod);
MyTimer.Start();
}

private void TriggerMethod(object source, ElapsedEventArgs e)
{
MyTimer.Interval = [pseudocode]Time between now and midnight[/pseudocode];
}

原文

The point of this timer is to execute some code whenever it's midnight.
So basically, the first interval will be between Now and midnight and all intervals following that will be 24hours.

Now that's all well and good, but I was wondering how this timer business works. Is the MyTimer.Interval recalculated each time the timer resets?

System.Timers.Timer MyTimer = new System.Timers.Timer();
MyTimer.Elapsed += new ElapsedEventHandler(TriggeredMethod);
MyTimer.Interval = [pseudocode]Time between now and midnight[/pseudocode];
MyTimer.Start();

EDIT:

I'm having trouble setting the Interval inside of my TriggerMethod. Where/how should I initiate the Timer so I don't get any context errors?

private void Form1_Load(object sender, EventArgs e)
{
System.Timers.Timer MyTimer = new System.Timers.Timer();
MyTimer.Elapsed += new ElapsedEventHandler(TriggeredMethod);
MyTimer.Start();
}

private void TriggerMethod(object source, ElapsedEventArgs e)
{
MyTimer.Interval = [pseudocode]Time between now and midnight[/pseudocode];
}

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书间行客 2024-09-13 01:29:58

Interval 属性是计时器调用之间的毫秒数。

要在午夜运行计时器，您需要将每个 Elapsed 事件中的 Interval 更改为 (int)(DateTime.Today.AddDays(1) - DateTime。现在).TotalMilliseconds。

要访问 Elapsed 处理程序内的计时器，您需要将计时器存储在类中的一个字段中，如下所示：

System.Timers.Timer MyTimer
private void Form1_Load(object sender, EventArgs e)
{
    MyTimer = new System.Timers.Timer();
    //...
}

请注意，System.Timers.Timer< /code> 不会在 UI 线程上触发。因此，您无法在 Elapsed 处理程序内操作表单。如果需要操作表单，可以切换到 System.Windows.Forms.Timer（不太准确）或调用 BeginInvoke。

The Interval property is the number of milliseconds between timer invocations.

To run the timer at midnight, you would need to change Interval in each Elapsed event to (int)(DateTime.Today.AddDays(1) - DateTime.Now).TotalMilliseconds.

To access the timer inside the Elapsed handler, you'll need to store the timer in a field in your class, like this:

System.Timers.Timer MyTimer
private void Form1_Load(object sender, EventArgs e)
{
    MyTimer = new System.Timers.Timer();
    //...
}

Note, by the way, that System.Timers.Timer will not fire on the UI thread.
Therefore, you cannot manipulate the form inside the Elapsed handler.
If you need to manipulate the form, you can either switch to System.Windows.Forms.Timer (which is less accurate) or call BeginInvoke.

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