EventWatcherOptions Constructeurs

Référence

Définition

Espace de noms:: System.Management

Assembly:: System.Management.dll

Paquet:: System.Management v6.0.0

Paquet:: System.Management v7.0.0

Paquet:: System.Management v8.0.0

Paquet:: System.Management v9.0.0-preview.2.24128.5

Important

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Initialise une nouvelle instance de la classe EventWatcherOptions pour la surveillance d'événements.

Surcharges

EventWatcherOptions()	Initialise une nouvelle instance de la classe EventWatcherOptions pour la surveillance d'événements, en utilisant les valeurs par défaut. Il s’agit du constructeur sans paramètre.
EventWatcherOptions(ManagementNamedValueCollection, TimeSpan, Int32)	Initialise une nouvelle instance de la classe EventWatcherOptions avec les valeurs spécifiées.

EventWatcherOptions()

Source:: ManagementOptions.cs

Source:: ManagementOptions.cs

Source:: ManagementOptions.cs

Initialise une nouvelle instance de la classe EventWatcherOptions pour la surveillance d'événements, en utilisant les valeurs par défaut. Il s’agit du constructeur sans paramètre.

public:
 EventWatcherOptions();

public EventWatcherOptions ();

Public Sub New ()

Exemples

L’exemple suivant montre comment le client reçoit une notification lorsqu’un instance de Win32_Process est créé parce que la classe d’événements est __InstanceCreationEvent. Pour plus d’informations, consultez la documentation Windows Management Instrumentation . Le client reçoit les événements de façon synchrone en appelant la méthode WaitForNextEvent. Cet exemple peut être testé par le démarrage d'un processus, comme le Bloc-notes, alors que l'exemple de code est en cours d'exécution.

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
        string query = "SELECT * FROM" +
            " __InstanceCreationEvent WITHIN 1 " +
            "WHERE TargetInstance isa \"Win32_Process\"";

        // Event options
        EventWatcherOptions eventOptions = new
            EventWatcherOptions();
        eventOptions.Timeout = System.TimeSpan.MaxValue;

        // Initialize an event watcher and subscribe to events
        // that match this query
        ManagementEventWatcher watcher =
            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.");
        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 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

Remarques

Sécurité du .NET Framework

Confiance totale accordée à l'appelant immédiat. Ce membre ne peut pas être utilisé par du code d'un niveau de confiance partiel. Pour plus d’informations, consultez Utilisation de bibliothèques à partir de code partiellement approuvé.

S’applique à

EventWatcherOptions(ManagementNamedValueCollection, TimeSpan, Int32)

Source:: ManagementOptions.cs

Source:: ManagementOptions.cs

Source:: ManagementOptions.cs

Initialise une nouvelle instance de la classe EventWatcherOptions avec les valeurs spécifiées.

public:
 EventWatcherOptions(System::Management::ManagementNamedValueCollection ^ context, TimeSpan timeout, int blockSize);

public EventWatcherOptions (System.Management.ManagementNamedValueCollection context, TimeSpan timeout, int blockSize);

new System.Management.EventWatcherOptions : System.Management.ManagementNamedValueCollection * TimeSpan * int -> System.Management.EventWatcherOptions

Public Sub New (context As ManagementNamedValueCollection, timeout As TimeSpan, blockSize As Integer)

Paramètres

context: ManagementNamedValueCollection

Objet de contexte d'options contenant des informations spécifiques au fournisseur à passer au fournisseur.

timeout: TimeSpan

Délai d'attente des événements suivants.

blockSize: Int32

Nombre d'événements à attendre dans chaque bloc.

Exemples

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
        string query = "SELECT * FROM" +
            " __InstanceCreationEvent WITHIN 1 " +
            "WHERE TargetInstance isa \"Win32_Process\"";

        // Event options
        // blockSize = 1 to receive one event
        EventWatcherOptions eventOptions = new
            EventWatcherOptions(null, System.TimeSpan.MaxValue,
            1);

        // Initialize an event watcher and subscribe to events
        // that match this query
        ManagementEventWatcher watcher =
            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.");
        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 String
        query = "SELECT * FROM" & _
            " __InstanceCreationEvent WITHIN 1 " & _
            "WHERE TargetInstance isa ""Win32_Process"""

        ' Event options
        ' blockSize = 1 to receive one event
        Dim eventOptions As New EventWatcherOptions( _
            Nothing, System.TimeSpan.MaxValue, 1)

        ' 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

Remarques

Sécurité du .NET Framework

S’applique à

Partager via

EventWatcherOptions Constructeurs

Définition

Surcharges

EventWatcherOptions()

Exemples

Remarques

Sécurité du .NET Framework

S’applique à

EventWatcherOptions(ManagementNamedValueCollection, TimeSpan, Int32)

Paramètres

Exemples

Remarques

Sécurité du .NET Framework

S’applique à

Ressources supplémentaires