ManagementOperationObserver Constructor
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Initializes a new instance of the ManagementOperationObserver class. This is the parameterless constructor.
public:
ManagementOperationObserver();
public ManagementOperationObserver ();
Public Sub New ()
The following example demonstrates how to perform an asynchronous instance enumeration. The example uses the ManagementOperationObserver class to handle management information and events asynchronously.
using System;
using System.Management;
// This example demonstrates how
// to perform an asynchronous instance enumeration.
public class EnumerateInstancesAsync
{
public EnumerateInstancesAsync()
{
// Enumerate asynchronously using Object Searcher
// ===============================================
// Instantiate an object searcher with the query
ManagementObjectSearcher searcher =
new ManagementObjectSearcher(new
SelectQuery("Win32_Service"));
// Create a results watcher object,
// and handler for results and completion
ManagementOperationObserver results = new
ManagementOperationObserver();
// Attach handler to events for results and completion
results.ObjectReady += new
ObjectReadyEventHandler(this.NewObject);
results.Completed += new
CompletedEventHandler(this.Done);
// Call the asynchronous overload of Get()
// to start the enumeration
searcher.Get(results);
// Do something else while results
// arrive asynchronously
while (!this.Completed)
{
System.Threading.Thread.Sleep (1000);
}
this.Reset();
}
private bool isCompleted = false;
private void NewObject(object sender,
ObjectReadyEventArgs obj)
{
Console.WriteLine("Service : {0}, State = {1}",
obj.NewObject["Name"],
obj.NewObject["State"]);
}
private bool Completed
{
get
{
return isCompleted;
}
}
private void Reset()
{
isCompleted = false;
}
private void Done(object sender,
CompletedEventArgs obj)
{
isCompleted = true;
}
public static void Main()
{
EnumerateInstancesAsync example =
new EnumerateInstancesAsync();
return;
}
}
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
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.
Produto | Versões |
---|---|
.NET | 8 (package-provided), 9 (package-provided) |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7 (package-provided), 4.7, 4.7.1 (package-provided), 4.7.1, 4.7.2 (package-provided), 4.7.2, 4.8 (package-provided), 4.8, 4.8.1 |
.NET Standard | 2.0 (package-provided) |
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