EventWatcherOptions Class
.NET Framework 3.0
Specifies options for management event watching.
Namespace: System.Management
Assembly: System.Management (in system.management.dll)
Assembly: System.Management (in system.management.dll)
The following example shows how the client receives notification when an instance of Win32_Process is created because the event class is __InstanceCreationEvent. For more information, see the Windows Management Instrumentation documentation in the MSDN Library at http://msdn.microsoft.com/library. The client receives events synchronously by calling the WaitForNextEvent method. This example can be tested by starting a process, such as Notepad, while the example code is running.
Imports System Imports System.Management ' This example shows synchronous consumption of events. ' The client is blocked while waiting for events. Public Class EventWatcherPolling Public Overloads Shared Function _ Main(ByVal args() As String) As Integer ' Create event query to be notified within 1 second of ' a change in a service Dim query As String query = "SELECT * FROM" & _ " __InstanceCreationEvent WITHIN 1 " & _ "WHERE TargetInstance isa ""Win32_Process""" ' Event options Dim eventOptions As New EventWatcherOptions eventOptions.Timeout = System.TimeSpan.MaxValue ' Initialize an event watcher and subscribe to events ' that match this query Dim watcher As New ManagementEventWatcher( _ "root\CIMV2", query, eventOptions) ' Block until the next event occurs ' Note: this can be done in a loop ' if waiting for more than one occurrence Console.WriteLine( _ "Open an application (notepad.exe) to trigger an event.") Dim e As ManagementBaseObject = _ watcher.WaitForNextEvent() 'Display information from the event Console.WriteLine( _ "Process {0} has created, path is: {1}", _ CType(e("TargetInstance"), _ ManagementBaseObject)("Name"), _ CType(e("TargetInstance"), _ ManagementBaseObject)("ExecutablePath")) 'Cancel the subscription watcher.Stop() Return 0 End Function 'Main End Class 'EventWatcherPolling
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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