InterfaceQueuingAttribute Classe

Definição

public ref class InterfaceQueuingAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Interface, AllowMultiple=true, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(false)]
public sealed class InterfaceQueuingAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Interface, AllowMultiple=true, Inherited=true)>]
[<System.Runtime.InteropServices.ComVisible(false)>]
type InterfaceQueuingAttribute = class
    inherit Attribute

Public NotInheritable Class InterfaceQueuingAttribute
Inherits Attribute

Herança

Object

Attribute

InterfaceQueuingAttribute

Atributos

AttributeUsageAttribute ComVisibleAttribute

Exemplos

O exemplo de código a seguir mostra como usar o InterfaceQueuingAttribute atributo.

public interface class IQueuedComponent
{
   void QueuedTask();
};


// Mark IQueuedComponent interface as queued
// Create the queued component class by inheriting the 
// System.EnterpriseServices.ServicedComponent class and an
// interface that is marked as queued with the InterfaceQueuing attribute

[InterfaceQueuing(true,Interface="IQueuedComponent")]
public ref class QueuedComponent sealed: public ServicedComponent, public IQueuedComponent
{
public:
   virtual void QueuedTask()
   {
      // Perform queued task here
   }

};

public interface IQueuedComponent
{
    void QueuedTask();
}
// Mark IQueuedComponent interface as queued
[InterfaceQueuing(true, Interface="IQueuedComponent")]
// Create the queued component class by inheriting the
// System.EnterpriseServices.ServicedComponent class and an
// interface that is marked as queued with the InterfaceQueuing attribute
public class QueuedComponent : ServicedComponent, IQueuedComponent
{
    public void QueuedTask()
    {
        // Perform queued task here
    }
}

O exemplo de código a seguir mostra como marcar um aplicativo COM+ como enfileirado no tempo de compilação usando o ApplicationQueuing atributo e habilitar o ouvinte COM+ definindo como QueueListenerEnabled true

// Mark the COM+ application as queued at compile time by using the 
// ApplicationQueuing attribute. Enable the COM+ listener by 
// setting the QueueListenerEnabled to true
[assembly:ApplicationQueuing(Enabled=true,QueueListenerEnabled=true)];

// Mark the COM+ application as queued at compile time by using the
// ApplicationQueuing attribute. Enable the COM+ listener by
// setting the QueueListenerEnabled to true
[assembly: ApplicationQueuing(Enabled=true, QueueListenerEnabled=true)]

O exemplo de código a seguir mostra como usar BindToMoniker para executar o moniker na fila, para obter uma instância do gravador, chamar o método que será gravado e forçar a liberação do objeto gravador para enviar a mensagem para a fila.

// Use BindToMoniker to run the queued moniker, to get an instance of the recorder
IQueuedComponent ^ qc = dynamic_cast<IQueuedComponent^>(System::Runtime::InteropServices::Marshal::BindToMoniker( "queue:/new:QueuedComponent" ));

// Call the method that will be recorded
qc->QueuedTask();

// Force the release of the recorder object, to send the message to the queue
System::Runtime::InteropServices::Marshal::ReleaseComObject( qc );

// Use BindToMoniker to run the queued moniker, to get an instance of the recorder
IQueuedComponent qc =
    (IQueuedComponent)System.Runtime.InteropServices.Marshal.BindToMoniker("queue:/new:QueuedComponent");
// Call the method that will be recorded
qc.QueuedTask();

// Force the release of the recorder object, to send the message to the queue
System.Runtime.InteropServices.Marshal.ReleaseComObject(qc);

Comentários

As chamadas nessa interface serão enfileiradas usando o Enfileiramento de Mensagens.

Para marcar uma interface como enfileirada, aplique esse atributo à interface usando a seguinte sintaxe: [InterfaceQueuing].

Os métodos membro de uma interface enfileirada devem atender aos requisitos para chamadas de método na fila, como não ter parâmetros ou ref nãoout.

Para obter mais informações sobre como usar atributos, consulte Atributos.