ManagementOperationObserver クラスとは? わかりやすく解説

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ManagementOperationObserver クラス

非同期操作管理管理情報の処理、および非同期的に受け取ったイベントの処理を行います

名前空間: System.Management
アセンブリ: System.Management (system.management.dll 内)
構文構文

Public Class ManagementOperationObserver
Dim instance As ManagementOperationObserver
public class ManagementOperationObserver
public ref class ManagementOperationObserver
public class ManagementOperationObserver
public class ManagementOperationObserver
使用例使用例

非同期インスタンス列挙実行する方法次の例に示します。この例では ManagementOperationObserver クラス使用して管理情報イベント非同期処理します

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
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;
    }
    
}
継承階層継承階層
System.Object
  System.Management.ManagementOperationObserver
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバ場合は、スレッド セーフであるとは限りません。
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