ManagementEventWatcher Konstruktor

Definisi

Ruang nama:

System.Management

Rakitan:

System.Management.dll

Paket:

System.Management v8.0.0

Menginisialisasi instans baru kelas ManagementEventWatcher.

Overload

ManagementEventWatcher()	Menginisialisasi instans baru kelas ManagementEventWatcher. Untuk inisialisasi lebih lanjut, atur properti pada objek . Ini adalah konstruktor tanpa parameter.
ManagementEventWatcher(EventQuery)	Menginisialisasi instans ManagementEventWatcher baru kelas saat diberi kueri peristiwa WMI.
ManagementEventWatcher(String)	Menginisialisasi instans ManagementEventWatcher baru kelas saat diberi kueri peristiwa WMI dalam bentuk string.
ManagementEventWatcher(ManagementScope, EventQuery)	Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan.
ManagementEventWatcher(String, String)	Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan. Untuk varian ini, kueri dan cakupan ditentukan sebagai string.
ManagementEventWatcher(ManagementScope, EventQuery, EventWatcherOptions)	Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan, sesuai dengan opsi yang ditentukan. Untuk varian ini, kueri dan cakupan adalah objek yang ditentukan. Objek opsi dapat menentukan opsi seperti waktu habis dan informasi konteks.
ManagementEventWatcher(String, String, EventWatcherOptions)	Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan, sesuai dengan opsi yang ditentukan. Untuk varian ini, kueri dan cakupan ditentukan sebagai string. Objek opsi dapat menentukan opsi seperti informasi waktu habis dan konteks.

ManagementEventWatcher()

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans baru kelas ManagementEventWatcher. Untuk inisialisasi lebih lanjut, atur properti pada objek . Ini adalah konstruktor tanpa parameter.

public:
 ManagementEventWatcher();

public ManagementEventWatcher ();

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
        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

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.

ManagementEventWatcher(EventQuery)

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans ManagementEventWatcher baru kelas saat diberi kueri peristiwa WMI.

public:
 ManagementEventWatcher(System::Management::EventQuery ^ query);

public ManagementEventWatcher (System.Management.EventQuery query);

new System.Management.ManagementEventWatcher : System.Management.EventQuery -> System.Management.ManagementEventWatcher

Public Sub New (query As EventQuery)

Parameter

query

EventQuery

Mewakili EventQuery kueri peristiwa WMI, yang menentukan peristiwa yang akan didengarkan oleh pengamat.

Contoh

Dalam contoh kode ini, klien menerima pemberitahuan ketika 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\"";

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

        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher(New EventQuery( _
        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

Keterangan

Namespace tempat pengamat akan mendengarkan peristiwa adalah namespace default yang saat ini diatur.

.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.

ManagementEventWatcher(String)

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans ManagementEventWatcher baru kelas saat diberi kueri peristiwa WMI dalam bentuk string.

public:
 ManagementEventWatcher(System::String ^ query);

public ManagementEventWatcher (string query);

new System.Management.ManagementEventWatcher : string -> System.Management.ManagementEventWatcher

Public Sub New (query As String)

Parameter

query

String

Kueri peristiwa WMI, yang menentukan peristiwa yang akan didengarkan pengamat.

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\"";

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

        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher(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

Keterangan

Namespace tempat pengamat akan mendengarkan peristiwa adalah namespace default yang saat ini diatur.

.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.

ManagementEventWatcher(ManagementScope, EventQuery)

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan.

public:
 ManagementEventWatcher(System::Management::ManagementScope ^ scope, System::Management::EventQuery ^ query);

public ManagementEventWatcher (System.Management.ManagementScope scope, System.Management.EventQuery query);

new System.Management.ManagementEventWatcher : System.Management.ManagementScope * System.Management.EventQuery -> System.Management.ManagementEventWatcher

Public Sub New (scope As ManagementScope, query As EventQuery)

Parameter

scope

ManagementScope

yang ManagementScope mewakili cakupan (namespace) tempat pengamat akan mendengarkan peristiwa.

query

EventQuery

Mewakili EventQuery kueri peristiwa WMI, yang menentukan peristiwa yang akan didengarkan oleh pengamat.

Contoh

Dalam contoh kode ini, klien menerima pemberitahuan ketika 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\"";

        // Initialize an event watcher and subscribe to events
        // that match this query
        ManagementEventWatcher watcher =
            new ManagementEventWatcher(
            new ManagementScope("root\\CIMV2"),
            new EventQuery(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 String
        query = "SELECT * FROM __InstanceCreationEvent " _
            & "WITHIN 1 WHERE " & _
            "TargetInstance isa ""Win32_Process"""

        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher( _
            New ManagementScope("root\CIMV2"), _
            New EventQuery(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

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.

ManagementEventWatcher(String, String)

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan. Untuk varian ini, kueri dan cakupan ditentukan sebagai string.

public:
 ManagementEventWatcher(System::String ^ scope, System::String ^ query);

public ManagementEventWatcher (string scope, string query);

new System.Management.ManagementEventWatcher : string * string -> System.Management.ManagementEventWatcher

Public Sub New (scope As String, query As String)

Parameter

scope

String

Cakupan manajemen (namespace) tempat pengamat akan mendengarkan peristiwa.

query

String

Kueri yang menentukan peristiwa yang akan didengarkan pengamat.

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\"";

        // Initialize an event watcher and subscribe to events
        // that match this query
        ManagementEventWatcher watcher =
            new ManagementEventWatcher("root\\CIMV2",
            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 String
        query = "SELECT * FROM __InstanceCreationEvent " _
            & "WITHIN 1 WHERE " & _
            "TargetInstance isa ""Win32_Process"""

        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher( _
            "root\CIMV2", 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

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.

ManagementEventWatcher(ManagementScope, EventQuery, EventWatcherOptions)

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan, sesuai dengan opsi yang ditentukan. Untuk varian ini, kueri dan cakupan adalah objek yang ditentukan. Objek opsi dapat menentukan opsi seperti waktu habis dan informasi konteks.

public:
 ManagementEventWatcher(System::Management::ManagementScope ^ scope, System::Management::EventQuery ^ query, System::Management::EventWatcherOptions ^ options);

public ManagementEventWatcher (System.Management.ManagementScope scope, System.Management.EventQuery query, System.Management.EventWatcherOptions options);

new System.Management.ManagementEventWatcher : System.Management.ManagementScope * System.Management.EventQuery * System.Management.EventWatcherOptions -> System.Management.ManagementEventWatcher

Public Sub New (scope As ManagementScope, query As EventQuery, options As EventWatcherOptions)

Parameter

scope

ManagementScope

yang ManagementScope mewakili cakupan (namespace) tempat pengamat akan mendengarkan peristiwa.

query

EventQuery

Mewakili EventQuery kueri peristiwa WMI, yang menentukan peristiwa yang akan didengarkan oleh pengamat.

options

EventWatcherOptions

Mewakili opsi tambahan yang EventWatcherOptions digunakan untuk watch peristiwa.

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, so wait for 1 event to return
        EventWatcherOptions options = new EventWatcherOptions(
            null, TimeSpan.MaxValue, 1);

        // Initialize an event watcher and subscribe to events
        // that match this query
        ManagementEventWatcher watcher =
            new ManagementEventWatcher(
            new ManagementScope("root\\CIMV2"),
            new EventQuery(query), options);

        // 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, so wait for 1 event to return
        Dim options As New EventWatcherOptions( _
            Nothing, TimeSpan.MaxValue, 1)


        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher( _
            New ManagementScope("root\CIMV2"), _
            New EventQuery(query), _
            options)

        ' 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.

ManagementEventWatcher(String, String, EventWatcherOptions)

Sumber:

ManagementEventWatcher.cs

Menginisialisasi instans ManagementEventWatcher baru kelas yang mendengarkan peristiwa yang sesuai dengan kueri peristiwa WMI yang diberikan, sesuai dengan opsi yang ditentukan. Untuk varian ini, kueri dan cakupan ditentukan sebagai string. Objek opsi dapat menentukan opsi seperti informasi waktu habis dan konteks.

public:
 ManagementEventWatcher(System::String ^ scope, System::String ^ query, System::Management::EventWatcherOptions ^ options);

public ManagementEventWatcher (string scope, string query, System.Management.EventWatcherOptions options);

new System.Management.ManagementEventWatcher : string * string * System.Management.EventWatcherOptions -> System.Management.ManagementEventWatcher

Public Sub New (scope As String, query As String, options As EventWatcherOptions)

Parameter

scope

String

Cakupan manajemen (namespace) tempat pengamat akan mendengarkan peristiwa.

query

String

Kueri yang menentukan peristiwa yang akan didengarkan pengamat.

options

EventWatcherOptions

Mewakili opsi tambahan yang EventWatcherOptions digunakan untuk watch peristiwa.

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, so wait for 1 event to return
        EventWatcherOptions options = new EventWatcherOptions(
            null, TimeSpan.MaxValue, 1);

        // Initialize an event watcher and subscribe to events
        // that match this query
        ManagementEventWatcher watcher =
            new ManagementEventWatcher(
            new ManagementScope("root\\CIMV2"),
            new EventQuery(query), options);

        // 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, so wait for 1 event to return
        Dim options As New EventWatcherOptions( _
            Nothing, TimeSpan.MaxValue, 1)


        ' Initialize an event watcher and subscribe to events 
        ' that match this query
        Dim watcher As New ManagementEventWatcher( _
            "root\CIMV2", _
            query, _
            options)

        ' 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.