c# timer.elapsed?

Question

我已經包含了System.Timers包，但是當我輸入：

Timer.Elapsed; //its not working, the property elapsed is just not there.

我記得它在 VB.NET 中。 為什么這不起作用？

Answer 1

它不是財產。 這是一個事件。

因此，您必須提供一個事件處理程序，該處理程序將在每次計時器滴答時執行。 像這樣的東西：

public void CreateTimer() 
{
    var timer = new System.Timers.Timer(1000); // fire every 1 second
    timer.Elapsed += HandleTimerElapsed;
}

public void HandleTimerElapsed(object sender, ElapsedEventArgs e)
{
    // do whatever it is that you need to do on a timer
}

Answer 2

微軟的例子。 http://msdn.microsoft.com/en-us/library/system.timers.timer.elapsed.aspx

Elapsed 是一個事件，因此需要一個事件處理程序。

using System;
using System.Timers;

public class Timer1
{
private static System.Timers.Timer aTimer;

public static void Main()
{       
    // Create a timer with a ten second interval.
    aTimer = new System.Timers.Timer(10000);

    // Hook up the Elapsed event for the timer.
    aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

    // Set the Interval to 2 seconds (2000 milliseconds).
    aTimer.Interval = 2000;
    aTimer.Enabled = true;

    Console.WriteLine("Press the Enter key to exit the program.");
    Console.ReadLine();       
}

// Specify what you want to happen when the Elapsed event is  
// raised. 
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
    Console.WriteLine("The Elapsed event was raised at {0}", e.SignalTime);
}
}

/* This code example produces output similar to the following:

Press the Enter key to exit the program.
The Elapsed event was raised at 5/20/2007 8:42:27 PM
The Elapsed event was raised at 5/20/2007 8:42:29 PM
The Elapsed event was raised at 5/20/2007 8:42:31 PM
...
 */

Answer 3

這里之前的答案都是正確的，但是現在 .net 6 / VS2022 已經發布並且關於可空性很重要，並且所有上述答案都會引發編譯器警告 CS8622。

解決方案是在回調函數的參數中簡單地將源對象標記為可為空，如下所示：

...
    var timer = new System.Timers.Timer(2000); // every 2000ms
    timer.Elapsed += TimerElapsedHandler;
...

public void TimerElapsedHandler(object? source, ElapsedEventArgs e)
{
    //Your Handling Code Here
}

Answer 4

您需要一個事件處理程序，然后在分配事件處理程序時啟用並在您的處理程序中停止一個條件

 Timer = new System.Timers.Timer();
 Timer.Elapsed += new System.Timers.ElapsedEventHandler(PageLoaded);
 Timer.Interval = 3000;
 Timer.Enabled = true;

.....................

 public void PageLoaded(object source, System.Timers.ElapsedEventArgs e)
        {
            // Do what ever here
            if (StopCondition)Timer.Enabled = false;
          
           
        }