IDispatchMessageInspector Gränssnitt

Definition

public interface class IDispatchMessageInspector

public interface IDispatchMessageInspector

type IDispatchMessageInspector = interface

Public Interface IDispatchMessageInspector

Exempel

I följande kodexempel visas en grundläggande IDispatchMessageInspector som skriver en sträng till konsolen när den anropas.

#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

I följande kodexempel visas implementeringen av en IServiceBehavior som lägger till i InspectorIDispatchMessageInspectorDispatchRuntime.MessageInspectors samlingen.

#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

I följande kodexempel visas hur du använder en programkonfigurationsfil InspectorIDispatchMessageInspectorför att läsa in tjänstbeteendet som infogar .

<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>

Kommentarer

Implementera IDispatchMessageInspector för att inspektera eller ändra inkommande eller utgående programmeddelanden antingen innan du skickar ett begärandemeddelande till en åtgärd eller innan du returnerar ett svarsmeddelande till en anropare. Det finns ett stort antal scenarier som kräver avlyssning av meddelanden innan åtgärden anropas. Du kan till exempel logga inkommande programmeddelanden eller utföra en funktion baserat på ett meddelandehuvud.

Vanligtvis infogas meddelandekontrollanter av ett tjänstbeteende (System.ServiceModel.Description.IServiceBehavior), ett slutpunktsbeteende (System.ServiceModel.Description.IEndpointBehavior) eller ett kontraktsbeteende (System.ServiceModel.Description.IContractBehavior). Beteendet lägger sedan till meddelandekontrollen i DispatchRuntime.MessageInspectors samlingen. Mer information om hur du utökar körningen med hjälp av beteenden finns i Utöka ServiceHost och Service Model Layer.

• Metoden AfterReceiveRequest aktiverar anpassat beteende när meddelandet har tagits emot, men innan det skickas till den avsedda åtgärden.

• Metoden BeforeSendReply aktiverar anpassat beteende när åtgärden returneras men innan svaret skickas.