////////////////////////////////////////////////////////////////////////////////////////////////////
    /// <summary>   Инспектор сообщений. </summary>
    ///
    /// <remarks>   Rvs,  09 . 09 . 2010 . </remarks>
    ////////////////////////////////////////////////////////////////////////////////////////////////////
    class Logger:IDispatchMessageInspector
    {
        #region Члены IDispatchMessageInspector

        public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)
        {
            System.Windows.Forms.MessageBox.Show(request.ToString());
            return null;
        }

        public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
        {
            System.Windows.Forms.MessageBox.Show(reply.ToString());
        }

        #endregion
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////
    /// <summary>   Поведение хоста для инспектирования сообщений. </summary>
    ///
    /// <remarks>   Rvs,  09 . 09 . 2010 . </remarks>
    ////////////////////////////////////////////////////////////////////////////////////////////////////
    class LoggerBehavior : IEndpointBehavior
    {
        #region Члены IEndpointBehavior

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

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

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
        {
            endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new Logger());
        }

        public void Validate(ServiceEndpoint endpoint)
        {

        }

        #endregion
    }

ServiceEndpoint ep = host.AddServiceEndpoint(service.typeOfInterface, new BasicHttpBinding(), addr);
        ep.Behaviors.Add(new LoggerBehavior());