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EventWatcherOptions Class

Specifies options for management event watching.

For a list of all members of this type, see EventWatcherOptions Members.

System.Object
   System.Management.ManagementOptions
      System.Management.EventWatcherOptions

[Visual Basic]
Public Class EventWatcherOptions
   Inherits ManagementOptions
[C#]
public class EventWatcherOptions : ManagementOptions
[C++]
public __gc class EventWatcherOptions : public ManagementOptions
[JScript]
public class EventWatcherOptions extends ManagementOptions

Thread Safety

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

Example

[C#] 
using System; 
using System.Management; 

// This example demonstrates how to specify a timeout and a batch count 
// when listening to an event using ManagementEventWatcher object. 
class Sample_EventWatcherOptions 
{ 
    public static int Main(string[] args) {
        ManagementClass newClass = new ManagementClass(); 
        newClass["__CLASS"] = "TestDeletionClass"; 
        newClass.Put(); 
        
        EventWatcherOptions options = new EventWatcherOptions(null, 
                                                              new TimeSpan(0,0,0,5),
                                                              1); 
        ManagementEventWatcher watcher = new ManagementEventWatcher(null, 
                                                                    new WqlEventQuery("__classdeletionevent"), 
                                                                    options); 
        MyHandler handler = new MyHandler(); 
        watcher.EventArrived += new EventArrivedEventHandler(handler.Arrived); 
        watcher.Start(); 

        // Delete class to trigger event
        newClass.Delete(); 

        //For the purpose of this example, we will wait
        // two seconds before main thread terminates.
        System.Threading.Thread.Sleep(2000); 

        watcher.Stop(); 

        return 0;
    } 

    public class MyHandler
    {
       public void Arrived(object sender, EventArrivedEventArgs e) {
           Console.WriteLine("Class Deleted= " +
               ((ManagementBaseObject)e.NewEvent["TargetClass"])["__CLASS"]);
       } 
    }
}
   
[Visual Basic] 
Imports System
Imports System.Management

' This example demonstrates how to specify a timeout and a batch count 
' when listening to an event using the ManagementEventWatcher object. 
Class Sample_EventWatcherOptions
    Public Shared Sub Main() 
        Dim newClass As New ManagementClass() 
        newClass("__CLASS") = "TestDeletionClass"
        newClass.Put()
    
        Dim options As _
            New EventWatcherOptions(Nothing, New TimeSpan(0, 0, 0, 5), 1)
        Dim watcher As New ManagementEventWatcher( _
            Nothing, _
            New WqlEventQuery("__classdeletionevent"), _
            options)
        Dim handler As New MyHandler()
        AddHandler watcher.EventArrived, AddressOf handler.Arrived
        watcher.Start()
      
        ' Delete class to trigger event
        newClass.Delete()
      
        ' For the purpose of this example, we will wait
        ' two seconds before main thread terminates.
        System.Threading.Thread.Sleep(2000)
        watcher.Stop()
    End Sub
     
    Public Class MyHandler
        Public Sub Arrived(sender As Object, e As EventArrivedEventArgs)
            Console.WriteLine("Class Deleted = " & _
                CType(e.NewEvent("TargetClass"), ManagementBaseObject)("__CLASS"))
        End Sub
    End Class
End Class
   

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Management

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

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

See Also

EventWatcherOptions Members | System.Management Namespace

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