ManagementEventWatcher.Options ManagementEventWatcher.Options ManagementEventWatcher.Options ManagementEventWatcher.Options Property

Definizione

Ottiene o imposta le opzioni utilizzate per il controllo degli eventi.Gets or sets the options used to watch for events.

public:
 property System::Management::EventWatcherOptions ^ Options { System::Management::EventWatcherOptions ^ get(); void set(System::Management::EventWatcherOptions ^ value); };
public System.Management.EventWatcherOptions Options { get; set; }
member this.Options : System.Management.EventWatcherOptions with get, set
Public Property Options As EventWatcherOptions

Valore della proprietà

Opzioni dell'evento utilizzate per controllare gli eventi.The event options used to watch for events.

Esempi

Nell'esempio seguente viene illustrato il modo in cui il client riceve una notifica quando viene creata un'istanza di Win32_Process perché la classe di evento è InstanceCreationEvent.The following example shows how the client receives notification when an instance of Win32_Process is created because the event class is __InstanceCreationEvent. Per ulteriori informazioni, vedere la documentazione Strumentazione gestione Windows .For more information, see the Windows Management Instrumentation documentation. Il client riceve gli eventi in modo sincrono chiamando il metodo WaitForNextEvent.The client receives events synchronously by calling the WaitForNextEvent method. Questo esempio può essere testato avviando un processo, ad esempio Blocco note, mentre il codice di esempio è in esecuzione.This example can be tested by starting a process, such as Notepad, while the example code is running.

using System;
using System.Management;

// This example shows synchronous consumption of events. 
// The client is blocked while waiting for events. 

public class EventWatcherPolling 
{
    public static int Main(string[] args) 
    {
        // Create event query to be notified within 1 second of 
        // a change in a service
        WqlEventQuery query = 
            new WqlEventQuery("__InstanceCreationEvent", 
            new TimeSpan(0,0,1), 
            "TargetInstance isa \"Win32_Process\"");

        // Initialize an event watcher and subscribe to events 
        // that match this query
        ManagementEventWatcher watcher =
            new ManagementEventWatcher();
        watcher.Query = query;
        // times out watcher.WaitForNextEvent in 5 seconds
        watcher.Options.Timeout = new TimeSpan(0,0,5);
      
        // 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.");
        ManagementBaseObject e = watcher.WaitForNextEvent();

        //Display information from the event
        Console.WriteLine(
            "Process {0} has been created, path is: {1}", 
            ((ManagementBaseObject)e
            ["TargetInstance"])["Name"],
            ((ManagementBaseObject)e
            ["TargetInstance"])["ExecutablePath"]);

        //Cancel the subscription
        watcher.Stop();
        return 0;
    }
}
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 New WqlEventQuery( _
            "__InstanceCreationEvent", _
            New TimeSpan(0, 0, 1), _
            "TargetInstance isa ""Win32_Process""")

        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher
        watcher.Query = query
        ' times watcher.WaitForNextEvent in 5 seconds
        watcher.Options.Timeout = New TimeSpan(0, 0, 5)

        ' 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

Commenti

Valore proprietàProperty Value

Opzioni utilizzate per controllare gli eventi.The options used to watch for events.

Sicurezza di .NET Framework.NET Framework Security

Attendibilità totale per il chiamante immediato.Full trust for the immediate caller. Impossibile utilizzare questo membro in codice parzialmente attendibile.This member cannot be used by partially trusted code. Per altre informazioni, vedere uso di librerie da codice parzialmente attendibile.For more information, see Using Libraries from Partially Trusted Code.

Si applica a