ManagementOperationObserver.Completed Event
Assembly: System.Management (in system.management.dll)
'Declaration Public Event Completed As CompletedEventHandler 'Usage Dim instance As ManagementOperationObserver Dim handler As CompletedEventHandler AddHandler instance.Completed, handler
/** @event */ public void add_Completed (CompletedEventHandler value) /** @event */ public void remove_Completed (CompletedEventHandler value)
JScript supports the use of events, but not the declaration of new ones.
Event Data
The event handler receives an argument of type CompletedEventArgs containing data related to this event. The following CompletedEventArgs properties provide information specific to this event.
| Property | Description |
|---|---|
| Context (inherited from ManagementEventArgs) | Gets the operation context echoed back from the operation that triggered the event. |
| Gets the completion status of the operation. | |
| Gets or sets additional status information within a WMI object. This may be null. |
.NET Framework Security
Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
The following example demonstrates how to perform an asynchronous instance enumeration. The example uses the ManagementOperationObserver class to handle management information and events asynchronously.
Imports System Imports System.Management ' This example demonstrates how ' to perform an asynchronous instance enumeration. Public Class EnumerateInstancesAsync Public Sub New() Me.isCompleted = False ' Enumerate asynchronously using Object Searcher ' =============================================== ' Instantiate an object searcher with the query Dim searcher As ManagementObjectSearcher searcher = New ManagementObjectSearcher( _ New SelectQuery("Win32_Service")) ' Create a results watcher object, ' and handler for results and completion Dim results As ManagementOperationObserver results = New ManagementOperationObserver ' Attach handler to events for ' results and completion AddHandler results.ObjectReady, _ AddressOf Me.NewObject AddHandler results.Completed, _ AddressOf Me.Done ' Call the asynchronous overload of ' Get() to start the enumeration searcher.Get(results) ' Do something else while results ' arrive(asynchronously) Do While (Me.Completed.Equals(False)) System.Threading.Thread.Sleep(1000) Loop Me.Reset() End Sub Private isCompleted As Boolean Private Sub NewObject(ByVal sender As Object, _ ByVal e As ObjectReadyEventArgs) Console.WriteLine("Service : {0}, State = {1}", _ e.NewObject("Name"), e.NewObject("State")) End Sub Private ReadOnly Property Completed() As Boolean Get Return isCompleted End Get End Property Private Sub Reset() isCompleted = False End Sub Private Sub Done(ByVal sender As Object, _ ByVal e As CompletedEventArgs) isCompleted = True End Sub Public Shared Function _ Main(ByVal args() As String) As Integer Dim example As New EnumerateInstancesAsync Return 0 End Function 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.