Mono Documentation

Provides a mechanism for executing methods at specified intervals. [Edit]

Thread Safety

All public static members of this type are safe for multithreaded operations. No instance members are guaranteed to be thread safe.

Remarks

A System.Threading.TimerCallback delegate is used to specify the methods associated with a Timer . The methods do not execute in the thread that created the timer; they execute in a separate thread that is automatically allocated by the system. The timer delegate is specified when the timer is constructed, and cannot be changed.
When creating a timer, the application specifies an amount of time to wait before the first invocation of the delegate methods (due time), and an amount of time to wait between subsequent invocations (period). A timer invokes its methods once when its due time elapses, and invokes its methods once per period thereafter. These values can be changed, or the timer disabled using the Timer.Change(int, int) method.
When a timer is no longer needed, use the Timer.Dispose(WaitHandle) method to free the resources held by the timer.
[Edit]

Example

The following example demonstrates the features of the System.Threading.Timer class.
C# Example
using System;
using System.Threading;

class TimerExampleState {
    public int counter = 0;
    public Timer tmr;
}

class App {
   public static void Main() {
    TimerExampleState s = new TimerExampleState();

    // Create the delegate that invokes methods for the timer.
    TimerCallback timerDelegate = new TimerCallback(CheckStatus);

    // Create a timer that waits one second, then invokes every second.
    Timer timer = new Timer(timerDelegate, s, 1000, 1000);
    
    // Keep a handle to the timer, so it can be disposed.
    s.tmr = timer;

    // The main thread does nothing until the timer is disposed.
    while (s.tmr != null)
        Thread.Sleep(0);
    Console.WriteLine("Timer example done.");
   }
   // The following method is called by the timer's delegate.

   static void CheckStatus(Object state) {
    TimerExampleState s = (TimerExampleState) state;
    s.counter++;
          Console.WriteLine("{0} Checking Status {1}.",DateTime.Now.TimeOfDay, s.counter);
        if (s.counter == 5) {
        // Shorten the period. Wait 10 seconds to restart the timer.
        (s.tmr).Change(10000,100);
        Console.WriteLine("changed...");
    }
        if (s.counter == 10) {
        Console.WriteLine("disposing of timer...");
        s.tmr.Dispose();
        s.tmr = null;
    }
   }
}
An example of some output is
10:51:40.5809015 Checking Status 1. 10:51:41.5823515 Checking Status 2. 10:51:42.5838015 Checking Status 3. 10:51:43.5852515 Checking Status 4. 10:51:44.5867015 Checking Status 5. changed... 10:51:54.5911870 Checking Status 6. 10:51:54.6913320 Checking Status 7. 10:51:54.7914770 Checking Status 8. 10:51:54.8916220 Checking Status 9. 10:51:54.9917670 Checking Status 10. disposing of timer... Timer example done.
The exact timings returned by this example will vary.

Requirements

Namespace: System.Threading
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0

System.Threading.Timer Class

Thread Safety

Remarks

Example

Requirements