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Timer Constructor (Double)

Initializes a new instance of the Timer class, and sets the Interval property to the specified number of milliseconds.

Namespace:  System.Timers
Assembly:  System (in System.dll)

public Timer(
	double interval
)

Parameters

interval
Type: System.Double
The time, in milliseconds, between events. The value must be greater than zero and less than or equal to Int32.MaxValue.

ExceptionCondition
ArgumentException

The value of the interval parameter is less than or equal to zero, or greater than Int32.MaxValue.

This constructor sets the Interval property of the new timer instance, but does not enable the timer.

The following example creates a Timer that displays "Hello World!" on the console after ten seconds.

Use the System.Timers namespace for this example.


// From command line, compile with /r:System.dll
using System;
using System.Timers;

public class Timer2
{
    private static System.Timers.Timer aTimer;

    public static void Main()
    {
        // Normally, the timer is declared at the class level,
        // so that it stays in scope as long as it is needed.
        // If the timer is declared in a long-running method,  
        // KeepAlive must be used to prevent the JIT compiler 
        // from allowing aggressive garbage collection to occur 
        // before the method ends. (See end of method.)
        //System.Timers.Timer aTimer;

        // Create a timer with a ten second interval.
        aTimer = new System.Timers.Timer(10000);

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

        // Only raise the event the first time Interval elapses.
        aTimer.AutoReset = false;
        aTimer.Enabled = true;

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

        // If the timer is declared in a long-running method, use
        // KeepAlive to prevent garbage collection from occurring
        // before the method ends.
        //GC.KeepAlive(aTimer);
    }

    // Specify what you want to happen when the Elapsed event is 
    // raised.
    private static void OnTimedEvent(object source, ElapsedEventArgs e) 
    {
        Console.WriteLine("Hello World!");
    }
}

/* This code example produces the following output:

Press the Enter key to exit the program.
Hello World!
 */


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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