EventArrivedEventHandler Delegate
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EventArrivedEventHandler Delegate

Represents the method that will handle the EventArrived event.

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

public delegate void EventArrivedEventHandler(
	Object sender,
	EventArrivedEventArgs e


Type: System.Object
The instance of the object for which to invoke this method.
Type: System.Management.EventArrivedEventArgs
The EventArrivedEventArgs that specifies the reason the event was invoked.

The following asynchronous example sets up a WMI timer to raise an event every second, and removes it when no longer needed. The ManagementEventWatcher defines several .NET Framework events which are raised when WMI events are delivered. Delegates are attached to these events for handling the incoming data.

using System;
using System.Management;

// This example shows asynchronous consumption of events.
// In this example you are listening for timer events.
// The first part of the example sets up the timer.
public class EventWatcherAsync 
    public EventWatcherAsync()
        // Set up a timer to raise events every 1 second
        ManagementClass timerClass = 
            new ManagementClass("__IntervalTimerInstruction");
        ManagementObject timer = timerClass.CreateInstance();
        timer["TimerId"] = "Timer1";
        timer["IntervalBetweenEvents"] = 1000;

        // Set up the event consumer
        // Create event query to receive timer events
        WqlEventQuery query = 
            new WqlEventQuery("__TimerEvent",

        // Initialize an event watcher and 
        // subscribe to timer events 
        ManagementEventWatcher watcher = 
            new ManagementEventWatcher(query);

        // Set up a listener for events
        watcher.EventArrived += 
            new EventArrivedEventHandler(

        // Start listening

        // Do something in the meantime

        // Stop listening


    private void HandleEvent(object sender,
        EventArrivedEventArgs e)   
        Console.WriteLine("Event arrived !");

    public static void Main(string[] args) 
        // start the event watcher
        EventWatcherAsync eventWatcher = new

.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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