Перехват текста сообщений

using System.ServiceModel;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Description;
using System.ServiceModel.Channels;
 
  class MessageBehavior
        : IClientMessageInspector,
        IEndpointBehavior
    {
        public Action<string> OnSend { set; get; }
        public Action<string> OnReceive { set; get; }


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

        public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
        {
            clientRuntime.ClientMessageInspectors.Add(this);
        }

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
        {
        }

        public void Validate(ServiceEndpoint endpoint)
        {
        }


        public object BeforeSendRequest(ref Message request, IClientChannel channel)
        {
            OnSend?.Invoke(request.ToString());
            return null;
        }

        public void AfterReceiveReply(ref Message reply, object correlationState)
        {
            OnReceive?.Invoke(reply.ToString());
        }
 
{
  using (Service1Client client = new Service1Client())
  {
    client.Endpoint.EndpointBehaviors.Add(
      new MessageBehavior()
      {
        OnReceive = OnMsg,
        OnSend = OnMsg
      });
 
    var res = client.GetData(123);
  }  
}