c# timer.elapsed?

Question

I have included the System.Timers package, but when I type:

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

I remember it was there in VB.NET. Why doesn't this work?

Answer 1

It's not a property. It's an event .

So you gotta provide an event handler that will execute every time the timer ticks. Something like this:

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

Microsofts example. http://msdn.microsoft.com/en-us/library/system.timers.timer.elapsed.aspx

Elapsed is an event and therefore requires an eventhandler.

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

The previous answers here are all correct, however with .net 6 / VS2022 now out and about nullability is big deal, and all the above answers will throw compiler warning CS8622.

The solution to this is to simply mark the source object as nullable in your callback function's parameters, like such:

...
    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

You need an event handler, then after Enabling while assigning event handler and stop in your handler a condition

 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;
          
           
        }