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ManagementOperationObserver.Completed Event

Occurs when an operation has completed.

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

Public Event Completed As CompletedEventHandler

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.



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

        ' Do something else while results  
        ' arrive(asynchronously) 
        Do While (Me.Completed.Equals(False))



    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 
            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

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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