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ElapsedEventHandler Delegate

Represents the method that will handle the Elapsed event of a Timer.

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

Public Delegate Sub ElapsedEventHandler ( _
	sender As Object, _
	e As ElapsedEventArgs _
Dim instance As New ElapsedEventHandler(AddressOf HandlerMethod)
/** @delegate */
public delegate void ElapsedEventHandler (
	Object sender, 
	ElapsedEventArgs e
JScript supports the use of delegates, but not the declaration of new ones.



The source of the event.


An ElapsedEventArgs object that contains the event data.

When you create an ElapsedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates.

Imports System
Imports System.Timers

Public Class Timer1
    Public Shared Sub Main()
        ' Normally, the timer is declared at the class level, so
        ' that it doesn't go out of scope when the method ends.
        ' In this example, the timer is needed only while Main 
        ' is executing. However, KeepAlive must be used at the
        ' end of Main, to prevent the JIT compiler from allowing 
        ' aggressive garbage collection to occur before Main 
        ' ends.
        Dim aTimer As New System.Timers.Timer()

        ' Hook up the Elapsed event for the timer.
        AddHandler aTimer.Elapsed, AddressOf 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.")

        ' Keep the timer alive until the end of Main.
    End Sub
    ' Specify what you want to happen when the Elapsed event is 
    ' raised.
    Private Shared Sub OnTimedEvent(source As Object, e As ElapsedEventArgs)
        Console.WriteLine("Hello World!")
    End Sub
End Class

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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