EventWatcherOptions Konstruktor

Definisi

Ruang nama:

System.Management

Rakitan:

System.Management.dll

Paket:

System.Management v8.0.0

Menginisialisasi instans EventWatcherOptions baru kelas untuk pengamatan peristiwa.

Overload

EventWatcherOptions()	Menginisialisasi instans EventWatcherOptions baru kelas untuk pengamatan peristiwa, menggunakan nilai default. Ini adalah konstruktor tanpa parameter.
EventWatcherOptions(ManagementNamedValueCollection, TimeSpan, Int32)	Menginisialisasi instans EventWatcherOptions baru kelas dengan nilai yang diberikan.

EventWatcherOptions()

Sumber:

ManagementOptions.cs

Menginisialisasi instans EventWatcherOptions baru kelas untuk pengamatan peristiwa, menggunakan nilai default. Ini adalah konstruktor tanpa parameter.

public:
 EventWatcherOptions();

public EventWatcherOptions ();

Public Sub New ()

Contoh

Contoh berikut menunjukkan bagaimana klien menerima pemberitahuan saat instans Win32_Process dibuat karena kelas peristiwa __InstanceCreationEvent. Untuk informasi selengkapnya, lihat dokumentasi Instrumentasi Manajemen Windows . Klien menerima peristiwa secara sinkron dengan memanggil WaitForNextEvent metode . Contoh ini dapat diuji dengan memulai proses, seperti Notepad, saat kode contoh sedang berjalan.

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

Keterangan

.NET Framework Security

Kepercayaan penuh untuk penelepon segera. Anggota ini tidak dapat digunakan oleh kode tepercaya sebagian. Untuk informasi selengkapnya, lihat Menggunakan Pustaka dari Kode Tepercaya Sebagian.

EventWatcherOptions(ManagementNamedValueCollection, TimeSpan, Int32)

Sumber:

ManagementOptions.cs

Menginisialisasi instans EventWatcherOptions baru kelas dengan nilai yang diberikan.

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)

Parameter

context

ManagementNamedValueCollection

Objek konteks opsi yang berisi informasi khusus penyedia untuk diteruskan ke penyedia.

timeout

TimeSpan

Waktu habis untuk menunggu peristiwa berikutnya.

blockSize

Int32

Jumlah peristiwa yang harus ditunda di setiap blok.

Contoh

Contoh berikut menunjukkan bagaimana klien menerima pemberitahuan saat instans Win32_Process dibuat karena kelas peristiwa __InstanceCreationEvent. Untuk informasi selengkapnya, lihat dokumentasi Instrumentasi Manajemen Windows . Klien menerima peristiwa secara sinkron dengan memanggil WaitForNextEvent metode . Contoh ini dapat diuji dengan memulai proses, seperti Notepad, saat kode contoh sedang berjalan.

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

Keterangan

.NET Framework Security

Kepercayaan penuh untuk penelepon segera. Anggota ini tidak dapat digunakan oleh kode tepercaya sebagian. Untuk informasi selengkapnya, lihat Menggunakan Pustaka dari Kode Tepercaya Sebagian.