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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 void GetInstances(
	ManagementOperationObserver watcher
)

Parameters

watcher
Type: System.Management.ManagementOperationObserver
The object to handle the asynchronous operation's progress.

.NET Framework Security

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.


using System;
using System.Management;

public class AsyncGetExample
{
    public AsyncGetExample() 
    {
        ManagementClass c = 
            new ManagementClass("Win32_Process");
        ManagementOperationObserver ob =
            new ManagementOperationObserver();
        ob.ObjectReady += new ObjectReadyEventHandler(NewObject);
        ob.Completed += new CompletedEventHandler(Done);

        c.GetInstances(ob);

        while (!Completed)
            System.Threading.Thread.Sleep (1000);

        // Here you can use the object

    }

    private bool completed = false;

    private void NewObject(object sender,
        ObjectReadyEventArgs e) 
    {
        Console.WriteLine("New result arrived: {0}",
            ((ManagementObject)(e.NewObject))["Name"]);
    }

    private void Done(object sender,
        CompletedEventArgs e) 
    {
        Console.WriteLine("async Get completed !");
        completed = true;
    }

    private bool Completed 
    { 
        get 
        {
            return completed;
        }
    }

    public static void Main()
    {
        AsyncGetExample asyncGet = new
            AsyncGetExample();

        return;
    }
}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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