Add timers to an array of objects

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Bobby - 31 Oct 2007 15:37 GMT

Dear all,
could someone show me how one would complete the following MSDN
example :

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Public Class Timer1
Public Shared Sub Main()
Dim aTimer As New System.Timers.Timer()
AddHandler aTimer.Elapsed, AddressOf OnTimedEvent
' Set the Interval to 5 seconds.
aTimer.Interval = 5000
aTimer.Enabled = True

Console.WriteLine("Press 'q' to quit the sample.")
While Console.Read() <> CInt("q")
End While
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
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so that one could have Timers for different objects and in the
OnTimeEvent you could get the object to whom this timer belongs? Is
this possible at all?
Many Thanks.

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Lloyd Sheen - 31 Oct 2007 16:25 GMT

> Dear all,
> could someone show me how one would complete the following MSDN
[quoted text clipped - 27 lines]
> this possible at all?
> Many Thanks.

Depending on what you want there are a couple of ways to do this.

If you mean by "different objects", objects which are associated with a
timer (not the timer itself) then you can create a class that inherits the
System.Timers.Timer class. Then add a property that allows you to specify
which object the timer is associated with.

If you mean the timer object itself then in the event the "source" argument
is a reference to the timer.

Hope this helps
Lloyd Sheen

Reply to this Message

Phill W. - 31 Oct 2007 18:20 GMT

> could someone show me how one would complete the following MSDN
> example :

<snip>

> so that one could have Timers for different objects and in the
> OnTimeEvent you could get the object to whom this timer belongs? Is
> this possible at all?

So you want [lots of] /different/ objects, each with their own "Timer"
event, have them /all/ call the same OnTimedEvent routine and, in that
event, be able to find out /which/ of the objects just did so?

No problem. :-)

Your object with a Timer looks like this ...

Class TimedObject
Public Event TimedEvent( sender as Object, e As ElapsedEventArgs )

Public Sub New(name as String, interval as Integer)
m_Name = name

m_Timer.Interval = interval
m_Timer.Start()

End Sub

Public ReadOnly Property Name() as String
Get
Return m_Name
End Get
End Property

Protected Overridable Sub OnTimedEvent( e as ElapsedEventArgs )
RaiseEvent TimedEvent( Me, e )
End Sub

Private m_Name as String
Private m_Timer as ...Timer

Private Sub m_Timer_Elapsed( _
sender as Object _
, e as ElapsedEventArgs _
) _
Handles m_Timer.Elapsed

Me.OnTimedEvent( e )

End Sub

End Class

Then, the class that's going to handles those events looks like this:

Class TimerTest
Sub Main()
Dim oThing1 as New TimedObject("Fred", 3000)
Addhandler oThing1.TimedEvent, AddressOf Thing_TimedEvent

Dim oThing2 as New TimedObject("Bob", 5000)
Addhandler oThing2.TimedEvent, AddressOf Thing_TimedEvent

Console.ReadLine()

End Sub

Private Sub OnTimedEvent( _
sender As Object _
, e As ElapsedEventArgs _
)
If TypeOf sender Is TimedObject Then
With DirectCast( sender, TimedObject )
Console.WriteLine(.Name)
End With
Else
Console.WriteLine(sender.GetType().ToString())
End if
End Sub

End Class

HTH,
Phill W.

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Add timers to an array of objects

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