Timer Constructor

Initializes a new instance of the Timer class, and sets all the properties to their initial values.

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

'Declaration
Public Sub New

The following table shows initial property values for an instance of Timer.

Property

Initial value

AutoReset

true

Enabled

false

Interval

100 milliseconds

SynchronizingObject

A null reference (Nothing in Visual Basic).

The following code example sets up an event handler for the Timer.Elapsed event, creates a timer, and starts the timer. The event handler displays the SignalTime property each time it is raised.


Imports System
Imports System.Timers

Public Class Timer1

    Private Shared aTimer As System.Timers.Timer

    Public Shared Sub 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. You can experiment with this
        ' by commenting out the class-level declaration and 
        ' uncommenting the declaration below; then uncomment
        ' the GC.KeepAlive(aTimer) at the end of the method.
        'Dim aTimer As System.Timers.Timer

        ' Create a timer with a ten second interval.
        aTimer = New System.Timers.Timer(10000)

        ' 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.")
        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)
    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("The Elapsed event was raised at {0}", e.SignalTime)
    End Sub
End Class

' 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
'...


.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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