MessageQueue.ReceiveCompleted MessageQueue.ReceiveCompleted MessageQueue.ReceiveCompleted MessageQueue.ReceiveCompleted Event

Definition

Tritt ein, wenn eine Meldung aus der Warteschlange entfernt wurde.Occurs when a message has been removed from the queue. Dieses Ereignis wird von dem asynchronen BeginReceive()-Vorgang ausgelöst.This event is raised by the asynchronous operation, BeginReceive().

public:
 event System::Messaging::ReceiveCompletedEventHandler ^ ReceiveCompleted;
[System.Messaging.MessagingDescription("MQ_ReceiveCompleted")]
public event System.Messaging.ReceiveCompletedEventHandler ReceiveCompleted;
member this.ReceiveCompleted : System.Messaging.ReceiveCompletedEventHandler 
Public Custom Event ReceiveCompleted As ReceiveCompletedEventHandler 
Attribute

Beispiele

Im folgenden Codebeispiel wird ein Ereignishandler mit MyReceiveCompleteddem Namen erstellt, der ReceiveCompleted dem Ereignishandlerdelegaten angefügt wird, und es wird aufgerufen BeginReceive , um einen asynchronen Empfangsvorgang in der Warteschlange zu initiieren, die sich im Pfad ".\MyQueue" befindet.The following code example creates an event handler named MyReceiveCompleted, attaches it to the ReceiveCompleted event handler delegate, and calls BeginReceive to initiate an asynchronous receive operation on the queue that is located at the path ".\myQueue". Wenn ein ReceiveCompleted -Ereignis ausgelöst wird, empfängt das Beispiel die Nachricht und schreibt Ihren Text auf den Bildschirm.When a ReceiveCompleted event is raised, the example receives the message and writes its body to the screen. Im Beispiel wird dann BeginReceive erneut aufgerufen, um einen neuen asynchronen Empfangsvorgang zu initiieren.The example then calls BeginReceive again to initiate a new asynchronous receive operation.

#using <system.dll>
#using <system.messaging.dll>

using namespace System;
using namespace System::Messaging;
ref class MyNewQueue
{
public:

   //*************************************************
   // Provides an event handler for the ReceiveCompleted
   // event.
   //*************************************************
   static void MyReceiveCompleted( Object^ source, ReceiveCompletedEventArgs^ asyncResult )
   {
      // Connect to the queue.
      MessageQueue^ mq = dynamic_cast<MessageQueue^>(source);

      // End the asynchronous Receive operation.
      Message^ m = mq->EndReceive( asyncResult->AsyncResult );

      // Display message information on the screen.
      Console::WriteLine( "Message: {0}", m->Body );

      // Restart the asynchronous Receive operation.
      mq->BeginReceive();
      return;
   }
};


//*************************************************
// Provides an entry point into the application.
//         
// This example performs asynchronous receive operation
// processing.
//*************************************************
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 ReceiveCompleted event.
   myQueue->ReceiveCompleted += gcnew ReceiveCompletedEventHandler( MyNewQueue::MyReceiveCompleted );

   // Begin the asynchronous receive operation.
   myQueue->BeginReceive();

   // Do other work on the current thread.
   return 0;
}
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 receive 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 ReceiveCompleted event.
			myQueue.ReceiveCompleted += new 
				ReceiveCompletedEventHandler(MyReceiveCompleted);
			
			// Begin the asynchronous receive operation.
			myQueue.BeginReceive();
			
			// Do other work on the current thread.

			return;
		}


		//**************************************************
		// Provides an event handler for the ReceiveCompleted
		// event.
		//**************************************************
		
		private static void MyReceiveCompleted(Object source, 
			ReceiveCompletedEventArgs asyncResult)
		{
			// Connect to the queue.
			MessageQueue mq = (MessageQueue)source;

			// End the asynchronous Receive operation.
			Message m = mq.EndReceive(asyncResult.AsyncResult);

			// Display message information on the screen.
			Console.WriteLine("Message: " + (string)m.Body);

			// Restart the asynchronous Receive operation.
			mq.BeginReceive();
			
			return; 
		}
	}
}
Imports System.Messaging

Public Class MyNewQueue


        '
        ' Provides an entry point into the application.
        '		 
        ' This example performs asynchronous receive 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 ReceiveCompleted event.
            AddHandler myQueue.ReceiveCompleted, AddressOf _
                MyReceiveCompleted

            ' Begin the asynchronous receive operation.
            myQueue.BeginReceive()

            ' Do other work on the current thread.

            Return

        End Sub


        '
        ' Provides an event handler for the ReceiveCompleted
        ' event.
        '

        Private Shared Sub MyReceiveCompleted(ByVal [source] As _
            [Object], ByVal asyncResult As ReceiveCompletedEventArgs)

            ' Connect to the queue.
            Dim mq As MessageQueue = CType([source], MessageQueue)

            ' End the asynchronous Receive operation.
            Dim m As Message = mq.EndReceive(asyncResult.AsyncResult)

            ' Display message information on the screen.
            Console.WriteLine(("Message: " + CStr(m.Body)))

            ' Restart the asynchronous Receive operation.
            mq.BeginReceive()

            Return

        End Sub

End Class

Hinweise

BeginReceivewird bei der asynchronen Verarbeitung verwendet, um ReceiveCompleted das-Ereignis zu erhöhen, wenn eine Nachricht in der Warteschlange verfügbar ist.BeginReceive is used in asynchronous processing to raise the ReceiveCompleted event when a message is available in the queue.

EndReceive(IAsyncResult)wird verwendet, um den Vorgang abzuschließen, BeginReceive der durch einen-Rückruf initiiert wurde, und die Meldung einsehen, wenn das ReceiveCompleted -Ereignis ausgelöst wird.EndReceive(IAsyncResult) is used to complete the operation initiated by a call to BeginReceive and peek the message when the ReceiveCompleted event is raised.

Beim Erstellen eines ReceiveCompletedEventHandler-Delegaten bestimmen Sie die Methode für die Ereignisbehandlung.When you create a ReceiveCompletedEventHandler delegate, you identify the method that will handle the event. Um dem Ereignishandler das Ereignis zuzuordnen, fügen Sie dem Ereignis eine Instanz des Delegaten hinzu.To associate the event with your event handler, add an instance of the delegate to the event. Der Ereignishandler wird bei jedem Eintreten des Ereignisses aufgerufen, sofern der Delegat nicht entfernt wird.The event handler is called whenever the event occurs, unless you remove the delegate. Weitere Informationen zu Ereignishandlerdelegaten finden Sie unter behandeln und Auswerfen von Ereignissen.For more information about event handler delegates, see Handling and Raising Events.

Gilt für:

Siehe auch