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


 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()
    );
  }  
 }

 
 static class Test
  {
  static void RunTest()
   {
   using (Service1Client client = new Service1Client())
    {
     client
      .Endpoint
      .EndpointBehaviors
      .Add(
        new MessageBehavior()
         {
          OnReceive = OnMsg,
          OnSend = OnMsg
         }
      );
   
    var res = client.GetData(123);
    }
   }
  }
}