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Cómo: Inspeccionar y modificar mensajes en el servicio

Puede inspeccionar o modificar los mensajes entrantes o salientes en un servicio de Windows Communication Foundation (WCF) implementando System.ServiceModel.Dispatcher.IDispatchMessageInspector e insertándolo en el entorno de ejecución del servicio. Para obtener más información, vea Extender despachadores. La característica equivalente en el cliente es System.ServiceModel.Dispatcher.IClientMessageInspector.

Para inspeccionar o modificar mensajes

  1. Implemente la interfaz System.ServiceModel.Dispatcher.IDispatchMessageInspector.

  2. Implemente una interfaz System.ServiceModel.Description.IServiceBehavior, System.ServiceModel.Description.IEndpointBehavior o System.ServiceModel.Description.IContractBehavior según el nivel en el que desee insertar fácilmente el inspector de mensajes de servicio.

  3. Inserte su comportamiento antes de llamar al método ICommunicationObject.Open sobre el System.ServiceModel.ServiceHost. Para obtener más información, consulte Configuración y extensión del entorno de ejecución con comportamientos.

Ejemplo

Los ejemplos de código siguientes muestran, en orden:

  • Una implementación del inspector de servicio.

  • Un comportamiento de servicio que inserta el inspector.

  • Un archivo de configuración que carga y ejecuta el comportamiento en una aplicación de servicio.

#region IDispatchMessageInspector Members
public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel, InstanceContext instanceContext)
{
  Console.WriteLine("IDispatchMessageInspector.AfterReceiveRequest called.");
  return null;
}

public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
{
  Console.WriteLine("IDispatchMessageInspector.BeforeSendReply called.");
}
#endregion

#Region "IDispatchMessageInspector Members"
        Public Function AfterReceiveRequest(ByRef request As System.ServiceModel.Channels.Message, _
                           ByVal channel As IClientChannel, ByVal instanceContext As InstanceContext) _
                           As Object Implements IDispatchMessageInspector.AfterReceiveRequest
            Console.WriteLine("IDispatchMessageInspector.AfterReceiveRequest called.")
            Return Nothing
        End Function

        Public Sub BeforeSendReply(ByRef reply As System.ServiceModel.Channels.Message, ByVal correlationState As Object) _
        Implements IDispatchMessageInspector.BeforeSendReply
            Console.WriteLine("IDispatchMessageInspector.BeforeSendReply called.")
        End Sub
#End Region

#region IServiceBehavior Members
public void AddBindingParameters(
  ServiceDescription serviceDescription,
  ServiceHostBase serviceHostBase,
  System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints,
  BindingParameterCollection bindingParameters
)
{ return; }

public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
  foreach (ChannelDispatcher chDisp in serviceHostBase.ChannelDispatchers)
  {
    foreach (EndpointDispatcher epDisp in chDisp.Endpoints)
    {
      epDisp.DispatchRuntime.MessageInspectors.Add(new Inspector());
      foreach (DispatchOperation op in epDisp.DispatchRuntime.Operations)
        op.ParameterInspectors.Add(new Inspector());
    }
  }
}

#Region "IServiceBehavior Members"
        Public Sub AddBindingParameters(ByVal serviceDescription As ServiceDescription, _
                       ByVal serviceHostBase As ServiceHostBase, ByVal endpoints As _
                       System.Collections.ObjectModel.Collection(Of ServiceEndpoint), _
                       ByVal bindingParameters As BindingParameterCollection) Implements IServiceBehavior.AddBindingParameters
            Return
        End Sub

        Public Sub ApplyDispatchBehavior(ByVal serviceDescription As ServiceDescription, _
                                         ByVal serviceHostBase As ServiceHostBase) Implements _
                                         IServiceBehavior.ApplyDispatchBehavior
            For Each chDisp As ChannelDispatcher In serviceHostBase.ChannelDispatchers
                For Each epDisp As EndpointDispatcher In chDisp.Endpoints
                    epDisp.DispatchRuntime.MessageInspectors.Add(New Inspector())
                    For Each op As DispatchOperation In epDisp.DispatchRuntime.Operations
                        op.ParameterInspectors.Add(New Inspector())
                    Next op
                Next epDisp
            Next chDisp
        End Sub

<configuration>
  <system.serviceModel>
    <services>
      <service 
        name="Microsoft.WCF.Documentation.SampleService"
        behaviorConfiguration="metadataSupport">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/SampleService" />
          </baseAddresses>
        </host>
        <endpoint
          address=""
          binding="wsHttpBinding"
          contract="Microsoft.WCF.Documentation.ISampleService"
        />
        <endpoint
           address="mex"
           binding="mexHttpBinding"
           contract="IMetadataExchange"
        />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="metadataSupport">
          <serviceMetadata httpGetEnabled="true" httpGetUrl=""/>
          <serviceInterceptors />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <extensions>
      <behaviorExtensions>
        <add 
          name="serviceInterceptors" 
          type="Microsoft.WCF.Documentation.InspectorInserter, HostApplication, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null"
        />
      </behaviorExtensions>
    </extensions>
  </system.serviceModel>
</configuration>

Consulte también