PeekCompletedEventHandler-Delegat
Stellt die Methode dar, die das PeekCompleted-Ereignis einer MessageQueue behandelt.
Namespace: System.Messaging
Assembly: System.Messaging (in system.messaging.dll)
Syntax
'Declaration
Public Delegate Sub PeekCompletedEventHandler ( _
sender As Object, _
e As PeekCompletedEventArgs _
)
'Usage
Dim instance As New PeekCompletedEventHandler(AddressOf HandlerMethod)
public delegate void PeekCompletedEventHandler (
Object sender,
PeekCompletedEventArgs e
)
public delegate void PeekCompletedEventHandler (
Object^ sender,
PeekCompletedEventArgs^ e
)
/** @delegate */
public delegate void PeekCompletedEventHandler (
Object sender,
PeekCompletedEventArgs e
)
JScript unterstützt die Verwendung von Delegaten, aber nicht die Deklaration von neuen Delegaten.
Parameter
- sender
Die Quelle des Ereignisses, die MessageQueue.
- e
Ein PeekCompletedEventArgs, das die Ereignisdaten enthält.
Hinweise
Beim Erstellen eines PeekCompletedEventHandler-Delegaten bestimmen Sie die Methode für die Ereignisbehandlung. Um dem Ereignishandler das Ereignis zuzuordnen, fügen Sie dem Ereignis eine Instanz des Delegaten hinzu. Der Ereignishandler wird bei jedem Eintreten des Ereignisses aufgerufen, sofern der Delegat nicht entfernt wird. Weitere Informationen über Ereignishandlerdelegaten finden Sie unter Ereignisse und Delegaten.
Beispiel
Im folgenden Beispiel wird veranschaulicht, wie ein Ereignisdelegat (PeekCompletedEventHandler) für den Ereignishandler (MyPeekCompleted) erstellt und dem MessageQueue.PeekCompleted-Ereignis zugeordnet wird. Der Ereignishandler liest eine Nachricht und zeigt ihre Bezeichnung auf dem Bildschirm an.
Imports System
Imports System.Messaging
' Provides a container class for the example.
Public Class MyNewQueue
' Provides an entry point into the application.
'
' This example performs asynchronous peek operation
' processing.
Public Shared Sub Main()
' Create an instance of MessageQueue. Set its formatter.
Dim myQueue As New MessageQueue(".\myQueue")
myQueue.Formatter = New XmlMessageFormatter(New Type() _
{GetType([String])})
' Add an event handler for the PeekCompleted event.
AddHandler myQueue.PeekCompleted, AddressOf _
MyPeekCompleted
' Begin the asynchronous peek operation.
myQueue.BeginPeek()
' Do other work on the current thread.
Return
End Sub 'Main
'**************************************************
' Provides an event handler for the PeekCompleted
' event.
'**************************************************
Private Shared Sub MyPeekCompleted(ByVal [source] As _
[Object], ByVal asyncResult As PeekCompletedEventArgs)
' Connect to the queue.
Dim mq As MessageQueue = CType([source], MessageQueue)
' End the asynchronous peek operation.
Dim m As Message = mq.EndPeek(asyncResult.AsyncResult)
' Display message information on the screen.
Console.WriteLine(("Message: " + CStr(m.Body)))
' Restart the asynchronous peek operation.
mq.BeginPeek()
Return
End Sub 'MyPeekCompleted
End Class 'MyNewQueue
using System;
using System.Messaging;
namespace MyProject
{
/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
//**************************************************
// Provides an entry point into the application.
//
// This example performs asynchronous peek operation
// processing.
//**************************************************
public static void Main()
{
// Create an instance of MessageQueue. Set its formatter.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
myQueue.Formatter = new XmlMessageFormatter(new Type[]
{typeof(String)});
// Add an event handler for the PeekCompleted event.
myQueue.PeekCompleted += new
PeekCompletedEventHandler(MyPeekCompleted);
// Begin the asynchronous peek operation.
myQueue.BeginPeek();
// Do other work on the current thread.
return;
}
//**************************************************
// Provides an event handler for the PeekCompleted
// event.
//**************************************************
private static void MyPeekCompleted(Object source,
PeekCompletedEventArgs asyncResult)
{
// Connect to the queue.
MessageQueue mq = (MessageQueue)source;
// End the asynchronous peek operation.
Message m = mq.EndPeek(asyncResult.AsyncResult);
// Display message information on the screen.
Console.WriteLine("Message: " + (string)m.Body);
// Restart the asynchronous peek operation.
mq.BeginPeek();
return;
}
}
}
#using <system.dll>
#using <system.messaging.dll>
using namespace System;
using namespace System::Messaging;
// This example performs asynchronous peek operation
// processing.
//*************************************************
ref class MyNewQueue
{
public:
// Provides an event handler for the PeekCompleted
// event.
static void MyPeekCompleted( Object^ source, PeekCompletedEventArgs^ asyncResult )
{
// Connect to the queue.
MessageQueue^ mq = dynamic_cast<MessageQueue^>(source);
// End the asynchronous peek operation.
Message^ m = mq->EndPeek( asyncResult->AsyncResult );
// Display message information on the screen.
Console::WriteLine( "Message: {0}", static_cast<String^>(m->Body) );
// Restart the asynchronous peek operation.
mq->BeginPeek();
return;
}
};
// Provides an entry point into the application.
//
int main()
{
// Create an instance of MessageQueue. Set its formatter.
MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );
array<Type^>^p = gcnew array<Type^>(1);
p[ 0 ] = String::typeid;
myQueue->Formatter = gcnew XmlMessageFormatter( p );
// Add an event handler for the PeekCompleted event.
myQueue->PeekCompleted += gcnew PeekCompletedEventHandler( MyNewQueue::MyPeekCompleted );
// Begin the asynchronous peek operation.
myQueue->BeginPeek();
// Do other work on the current thread.
return 0;
}
package MyProject;
import System.*;
import System.Messaging.*;
/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
//**************************************************
// Provides an entry point into the application.
//
// This example performs asynchronous peek operation
// processing.
//**************************************************
public static void main(String[] args)
{
// Create an instance of MessageQueue. Set its formatter.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
myQueue.set_Formatter(new XmlMessageFormatter(new Type[]
{ String.class.ToType() }));
// Add an event handler for the PeekCompleted event.
myQueue.add_PeekCompleted(new PeekCompletedEventHandler(MyPeekCompleted));
// Begin the asynchronous peek operation.
myQueue.BeginPeek();
// Do other work on the current thread.
return;
} //main
//**************************************************
// Provides an event handler for the PeekCompleted
// event.
//**************************************************
private static void MyPeekCompleted(Object source,
PeekCompletedEventArgs asyncResult)
{
// Connect to the queue.
MessageQueue mq = (MessageQueue)source;
// End the asynchronous peek operation.
Message m = mq.EndPeek(asyncResult.get_AsyncResult());
// Display message information on the screen.
Console.WriteLine("Message: " + (String)(m.get_Body()));
// Restart the asynchronous peek operation.
mq.BeginPeek();
return;
} //MyPeekCompleted
} //MyNewQueue
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0
Siehe auch
Referenz
System.Messaging-Namespace
MessageQueue-Klasse
ReceiveCompletedEventHandler
PeekCompletedEventArgs-Klasse