WCF-exception-handling mit IErrorHandler

Dieser Artikel könnte helfen:

http://www.olegsych.com/2008/07/simplifying-wcf-using-exceptions-as-faults/

Ansatz, den ich verwendet habe, mit einigem Erfolg, wenn ich nicht wollte, um die Ausnahmen aufgelistet, die vielleicht geworfen werden ist das erstellen einer PassthroughExceptionHandlingBehavior Klasse, die eine IErrorHandler Verhalten für die server-Seite und IClientMessageInspector für die client-Seite. Die IErrorHandler Verhalten serialisiert die Ausnahme in der Fehler Meldung. Die IClientMessageInspector deserialisiert und wirft die Ausnahme.

Befestigen Sie dieses Verhalten sowohl für den WCF-client und WCF-server. Können Sie das Verhalten über die config-Datei oder durch anwenden der [PassthroughExceptionHandlingBehavior] - Attribut zu Ihrem Vertrag.

Hier ist das Verhalten der Klasse:

public class PassthroughExceptionHandlingBehavior : Attribute, IClientMessageInspector, IErrorHandler,
    IEndpointBehavior, IServiceBehavior, IContractBehavior
{
    #region IClientMessageInspector Members

    public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
    {
        if (reply.IsFault)
        {
            //Create a copy of the original reply to allow default processing of the message
            MessageBuffer buffer = reply.CreateBufferedCopy(Int32.MaxValue);
            Message copy = buffer.CreateMessage();  //Create a copy to work with
            reply = buffer.CreateMessage();         //Restore the original message

            var exception = ReadExceptionFromFaultDetail(copy) as Exception;
            if (exception != null)
            {
                throw exception;
            }
        }
    }

    public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel)
    {
        return null;
    }

    private static object ReadExceptionFromFaultDetail(Message reply)
    {
        const string detailElementName = "detail";

        using (XmlDictionaryReader reader = reply.GetReaderAtBodyContents())
        {
            //Find <soap:Detail>
            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element && 
                    detailElementName.Equals(reader.LocalName, StringComparison.InvariantCultureIgnoreCase))
                {
                    return ReadExceptionFromDetailNode(reader);
                }
            }
            //Couldn't find it!
            return null;
        }
    }

    private static object ReadExceptionFromDetailNode(XmlDictionaryReader reader)
    {
        //Move to the contents of <soap:Detail>
        if (!reader.Read())
        {
            return null;
        }

        //Return the deserialized fault
        try
        {
            NetDataContractSerializer serializer = new NetDataContractSerializer();
            return serializer.ReadObject(reader);
        }
        catch (SerializationException)
        {
            return null;
        }
    }

    #endregion

    #region IErrorHandler Members

    public bool HandleError(Exception error)
    {
        return false;
    }

    public void ProvideFault(Exception error, System.ServiceModel.Channels.MessageVersion version, ref System.ServiceModel.Channels.Message fault)
    {
        if (error is FaultException)
        {
            //Let WCF do normal processing
        }
        else
        {
            //Generate fault message manually including the exception as the fault detail
            MessageFault messageFault = MessageFault.CreateFault(
                new FaultCode("Sender"),
                new FaultReason(error.Message),
                error,
                new NetDataContractSerializer());
            fault = Message.CreateMessage(version, messageFault, null);
        }
    }

    #endregion

    #region IContractBehavior Members

    public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
        ApplyClientBehavior(clientRuntime);
    }

    public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime)
    {
        ApplyDispatchBehavior(dispatchRuntime.ChannelDispatcher);
    }

    public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
    {
    }

    #endregion

    #region IEndpointBehavior Members

    public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
    {
        ApplyClientBehavior(clientRuntime);
    }

    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)
    {
        ApplyDispatchBehavior(endpointDispatcher.ChannelDispatcher);
    }

    public void Validate(ServiceEndpoint endpoint)
    {
    }

    #endregion

    #region IServiceBehavior Members

    public void AddBindingParameters(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyDispatchBehavior(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
    {
        foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
        {
            ApplyDispatchBehavior(dispatcher);
        }
    }

    public void Validate(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
    {
    }

    #endregion

    #region Behavior helpers

    private static void ApplyClientBehavior(System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
    {
        foreach (IClientMessageInspector messageInspector in clientRuntime.MessageInspectors)
        {
            if (messageInspector is PassthroughExceptionHandlingBehavior)
            {
                return;
            }
        }

        clientRuntime.MessageInspectors.Add(new PassthroughExceptionHandlingBehavior());
    }

    private static void ApplyDispatchBehavior(System.ServiceModel.Dispatcher.ChannelDispatcher dispatcher)
    {
        //Don't add an error handler if it already exists
        foreach (IErrorHandler errorHandler in dispatcher.ErrorHandlers)
        {
            if (errorHandler is PassthroughExceptionHandlingBehavior)
            {
                return;
            }
        }

        dispatcher.ErrorHandlers.Add(new PassthroughExceptionHandlingBehavior());
    }

    #endregion
}

#region PassthroughExceptionHandlingElement class

public class PassthroughExceptionExtension : BehaviorExtensionElement
{
    public override Type BehaviorType
    {
        get { return typeof(PassthroughExceptionHandlingBehavior); }
    }

    protected override object CreateBehavior()
    {
        System.Diagnostics.Debugger.Launch();
        return new PassthroughExceptionHandlingBehavior();
    }
}

#endregion