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EventArrivedEventHandler Delegate

Represents the method that will handle the EventArrived event.

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

Public Delegate Sub EventArrivedEventHandler ( _
	sender As Object, _
	e As EventArrivedEventArgs _


Type: System.Object
The instance of the object for which to invoke this method.
Type: System.Management.EventArrivedEventArgs
The EventArrivedEventArgs that specifies the reason the event was invoked.

The following asynchronous example sets up a WMI timer to raise an event every second, and removes it when no longer needed. The ManagementEventWatcher defines several .NET Framework events which are raised when WMI events are delivered. Delegates are attached to these events for handling the incoming data.

Imports System
Imports System.Management

' This example shows asynchronous consumption of events.
' In this example you are listening for timer events.
' The first part of the example sets up the timer.

Public Class EventWatcherAsync

    Public Sub New()
        ' Set up a timer to raise events every 1 second
        Dim timerClass As New ManagementClass( _
        Dim timer As ManagementObject = _
        timer("TimerId") = "Timer1"
        timer("IntervalBetweenEvents") = 1000

        ' Set up the event consumer
        ' Create event query to receive timer events
        Dim query As New WqlEventQuery("__TimerEvent", _

        ' Initialize an event watcher and subscribe to 
        ' events that match this query
        Dim watcher As New ManagementEventWatcher(query)

        ' Set up a listener for events
        AddHandler watcher.EventArrived, _
            AddressOf Me.HandleEvent

        ' Start listening

        ' Do something in the meantime

        ' Stop listening

    End Sub

    Private Sub HandleEvent(ByVal sender As Object, _
        ByVal e As EventArrivedEventArgs)

        Console.WriteLine("Event arrived !")
    End Sub

    Public Overloads Shared Function _
            Main(ByVal args() As String) As Integer

        'start the event watcher
        Dim eventWatcher As New EventWatcherAsync

        Return 0

    End Function

End Class

.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.