Export (0) Print
Expand All

ManagementOperationObserver Class

Manages asynchronous operations and handles management information and events received asynchronously.

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

public class ManagementOperationObserver

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;
    }

}

System.Object
  System.Management.ManagementOperationObserver

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Community Additions

ADD
Show:
© 2014 Microsoft