ManagementClass.GetInstances Method (ManagementOperationObserver)


Returns the collection of all instances of the class, asynchronously.

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

Public Sub GetInstances (
	watcher As ManagementOperationObserver


Type: System.Management.ManagementOperationObserver

The object to handle the asynchronous operation's progress.

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 shows how to initialize a ManagementClass variable with a ManagementClass constructor and then get all the instances of a WMI class asynchronously.

Imports System
Imports System.Management

Public Class AsyncGetExample

    Public Sub New()

        Dim c As New ManagementClass("Win32_Process")
        Dim ob As New ManagementOperationObserver
        AddHandler ob.ObjectReady, AddressOf Me.NewObject
        AddHandler ob.Completed, AddressOf Me.Done


        While Not Me.Completed
        End While

        'Here you can use the object

    End Sub

    Private finished As Boolean = False

    Private Sub NewObject(ByVal sender As Object, _
    ByVal e As ObjectReadyEventArgs)
        Console.WriteLine("New result arrived: {0}", _
    End Sub

    Private Sub Done(ByVal sender As Object, _
    ByVal e As CompletedEventArgs)
        Console.WriteLine("async Get completed !")
        finished = True
    End Sub

    Private ReadOnly Property Completed() As Boolean
            Return finished
        End Get
    End Property

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

        Dim asyncGet As New AsyncGetExample

        Return 0

    End Function

End Class

.NET Framework
Available since 1.1
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