ManagementOperationObserver Class

Definition

Namespace:

System.Management

Assembly:

System.Management.dll

Package:

System.Management v10.0.0-preview.1.25080.5

Source:

ManagementOperationWatcher.cs

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

C#

public class ManagementOperationObserver

Inheritance

Object

ManagementOperationObserver

Examples

The following example demonstrates how to perform an asynchronous instance enumeration. The example uses the ManagementOperationObserver class to handle management information and events asynchronously.

C#

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;
    }
}

Constructors

ManagementOperationObserver()

Initializes a new instance of the ManagementOperationObserver class. This is the parameterless constructor.

Methods

Cancel()

Cancels all outstanding operations.

Events

Completed	Occurs when an operation has completed.
ObjectPut	Occurs when an object has been successfully committed.
ObjectReady	Occurs when a new object is available.
Progress	Occurs to indicate the progress of an ongoing operation.

Applies to