Threading Time

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Provides a mechanism for executing a method on a thread pool thread at specified intervals. This class cannot be inherited.

2. Constructing the Timer

The following example defines a StatusChecker class that includes a CheckStatus method whose signature is the same as the TimerCallback delegate. The state argument of the CheckStatus method is an AutoResetEvent object that is used to synchronize the application thread and the thread pool thread that executes the callback delegate.

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The StatusChecker class also includes two state variables:. The application thread creates the timer, which waits one second and then executes the CheckStatus callback method every milliseconds. The application thread then blocks until the AutoResetEvent object is signaled. Set method to set the state of the AutoResetEvent object to signaled. The first time this happens, the application thread calls the Change Int32, Int32 method so that the callback method now executes every half second.

It once again blocks until the AutoResetEvent object is signaled. When this happens, the timer is destroyed by calling its Dispose method, and the application terminates. Use a TimerCallback delegate to specify the method you want the Timer to execute. The signature of the TimerCallback delegate is:. The timer delegate is specified when the timer is constructed, and cannot be changed. The method does not execute on the thread that created the timer; it executes on a ThreadPool thread supplied by the system.

Use System.Threading.Timer to make a countdown timer in C#

NET includes four classes named Timer , each of which offers different functionality:. When you create a timer, you can specify an amount of time to wait before the first execution of the method due time , and an amount of time to wait between subsequent executions period. The Timer class has the same resolution as the system clock.

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This means that if the period is less than the resolution of the system clock, the TimerCallback delegate will execute at intervals defined by the resolution of the system clock, which is approximately 15 milliseconds on Windows 7 and Windows 8 systems. You can change the due time and period, or disable the timer, by using the Change method.

As long as you are using a Timer , you must keep a reference to it. As with any managed object, a Timer is subject to garbage collection when there are no references to it.

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The fact that a Timer is still active does not prevent it from being collected. When a timer is no longer needed, use the Dispose method to free the resources held by the timer. Note that callbacks can occur after the Dispose method overload has been called, because the timer queues callbacks for execution by thread pool threads.


You can use the Dispose WaitHandle method overload to wait until all callbacks have completed. The callback method executed by the timer should be reentrant, because it is called on ThreadPool threads. The callback can be executed simultaneously on two thread pool threads if the timer interval is less than the time required to execute the callback, or if all thread pool threads are in use and the callback is queued multiple times.

Timer is a simple, lightweight timer that uses callback methods and is served by thread pool threads. It is not recommended for use with Windows Forms, because its callbacks do not occur on the user interface thread. Timer is a better choice for use with Windows Forms. For server-based timer functionality, you might consider using System.

System Threading Timer in C# Explained With Examples

Timer , which raises events and has additional features. Initializes a new instance of the Timer class with an infinite period and an infinite due time, using the newly created Timer object as the state object. Initializes a new instance of the Timer class, using a bit signed integer to specify the time interval. Praniti Gupta 24 VivekKumar - no, a new thread is created for each timer event.

Timer is a subclass of Thread. I looked at docs. Little indentation of code would help to better understand the question. Priyank Mehta 1, 10 I am not sure how stackoverflow works and if I can ask follow- up questions. But, Can I achieve the same without creating new threads? You can continue here in the comments or edit the original post question citing: OK I got this.. So is there a way to run a function periodically without creating new threads?

Timer Class (viwacylu.tking) | Microsoft Docs

For parallelism you can use thread pools group of pre-instantiated, idle threads as described [ metachris. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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