ManagementOperationObserver.ObjectReady Kejadian
Definisi
Penting
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Terjadi ketika objek baru tersedia.
public:
event System::Management::ObjectReadyEventHandler ^ ObjectReady;
public event System.Management.ObjectReadyEventHandler ObjectReady;
member this.ObjectReady : System.Management.ObjectReadyEventHandler
Public Custom Event ObjectReady As ObjectReadyEventHandler
Public Event ObjectReady As ObjectReadyEventHandler
Jenis Acara
Contoh
Contoh berikut menunjukkan cara melakukan enumerasi instans asinkron. Contohnya menggunakan ManagementOperationObserver kelas untuk menangani informasi manajemen dan peristiwa secara asinkron.
using System;
using System.Management;
// This example demonstrates how
// to perform an asynchronous instance enumeration.
public class EnumerateInstancesAsync
{
public EnumerateInstancesAsync()
{
// Enumerate asynchronously using Object Searcher
// ===============================================
// Instantiate an object searcher with the query
ManagementObjectSearcher searcher =
new ManagementObjectSearcher(new
SelectQuery("Win32_Service"));
// Create a results watcher object,
// and handler for results and completion
ManagementOperationObserver results = new
ManagementOperationObserver();
// Attach handler to events for results and completion
results.ObjectReady += new
ObjectReadyEventHandler(this.NewObject);
results.Completed += new
CompletedEventHandler(this.Done);
// Call the asynchronous overload of Get()
// to start the enumeration
searcher.Get(results);
// Do something else while results
// arrive asynchronously
while (!this.Completed)
{
System.Threading.Thread.Sleep (1000);
}
this.Reset();
}
private bool isCompleted = false;
private void NewObject(object sender,
ObjectReadyEventArgs obj)
{
Console.WriteLine("Service : {0}, State = {1}",
obj.NewObject["Name"],
obj.NewObject["State"]);
}
private bool Completed
{
get
{
return isCompleted;
}
}
private void Reset()
{
isCompleted = false;
}
private void Done(object sender,
CompletedEventArgs obj)
{
isCompleted = true;
}
public static void Main()
{
EnumerateInstancesAsync example =
new EnumerateInstancesAsync();
return;
}
}
Imports System.Management
' This example demonstrates how
' to perform an asynchronous instance enumeration.
Public Class EnumerateInstancesAsync
Public Sub New()
Me.isCompleted = False
' Enumerate asynchronously using Object Searcher
' ===============================================
' Instantiate an object searcher with the query
Dim searcher As ManagementObjectSearcher
searcher = New ManagementObjectSearcher( _
New SelectQuery("Win32_Service"))
' Create a results watcher object,
' and handler for results and completion
Dim results As ManagementOperationObserver
results = New ManagementOperationObserver
' Attach handler to events for
' results and completion
AddHandler results.ObjectReady, _
AddressOf Me.NewObject
AddHandler results.Completed, _
AddressOf Me.Done
' Call the asynchronous overload of
' Get() to start the enumeration
searcher.Get(results)
' Do something else while results
' arrive(asynchronously)
Do While (Me.Completed.Equals(False))
System.Threading.Thread.Sleep(1000)
Loop
Me.Reset()
End Sub
Private isCompleted As Boolean
Private Sub NewObject(ByVal sender As Object, _
ByVal e As ObjectReadyEventArgs)
Console.WriteLine("Service : {0}, State = {1}", _
e.NewObject("Name"), e.NewObject("State"))
End Sub
Private ReadOnly Property Completed() As Boolean
Get
Return isCompleted
End Get
End Property
Private Sub Reset()
isCompleted = False
End Sub
Private Sub Done(ByVal sender As Object, _
ByVal e As CompletedEventArgs)
isCompleted = True
End Sub
Public Shared Function _
Main(ByVal args() As String) As Integer
Dim example As New EnumerateInstancesAsync
Return 0
End Function
End Class
Keterangan
Data Peristiwa
Penanganan aktivitas menerima argumen jenis ObjectReadyEventArgs yang berisi data yang terkait dengan kejadian ini. Properti berikut ini ObjectReadyEventArgs menyediakan informasi khusus untuk kejadian ini.
Properti | Deskripsi |
---|---|
Context (diwarisi dari ManagementEventArgs) | Mendapatkan konteks operasi yang digaungkan kembali dari operasi yang memicu peristiwa. |
NewObject | Mendapatkan objek yang baru dikembalikan. |
.NET Framework Security
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