EventArrivedEventArgs Class


Holds event data for the EventArrived event.

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


Public Class EventArrivedEventArgs
	Inherits ManagementEventArgs


Gets the operation context echoed back from the operation that triggered the event. (Inherited from ManagementEventArgs.)


Gets the WMI event that was delivered.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

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
Available since 1.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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