Localizing WCF Services with MessageInspectors

I am currently working on a web application with the following setup: Web server (ASP.Net MVC) talking to App server (WCF). The web app supports localization in three languages. As a result, many of the service operations need to return localized (product names, descriptions, …) information as well – depending on the current user’s profile in the web app.

I wanted to solve this as simple as possible (certainly not by adding a languageCode parameter to each operation, or so). A quick experiment lead me to the following…

public class LocalizationBehavior :
   IClientMessageInspector,   // client endpoint
   IDispatchMessageInspector, // service endpoint
   IEndpointBehavior
{
   private const string headerName = "localizationHeader";
   private const string @namespace = "urn:schemas-jolena-be:localization";

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

   public object BeforeSendRequest(ref Message request, IClientChannel channel)
   {
      request.Headers.Add(MessageHeader.CreateHeader(
         headerName,
         @namespace,
         Thread.CurrentThread.CurrentUICulture.Name));
      return null; // no correlation required
   }

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

   public object AfterReceiveRequest(ref Message request,
      IClientChannel channel, InstanceContext instanceContext)
   {
      var cultureName = request.Headers.GetHeader(headerName, @namespace);
      Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo(cultureName);
      return null; // no correlation required
   }

   public void AfterReceiveReply(ref Message reply, object correlationState) { }
   public void Validate(ServiceEndpoint endpoint) { }
   public void AddBindingParameters(ServiceEndpoint endpoint,
      BindingParameterCollection bindingParameters) { }
   public void BeforeSendReply(ref Message reply, object correlationState) { }
}

Applying the above behavior to both client and server side endpoints will make sure the CurrentUICulture corresponds to the one of client thread.

What do you think? Makes sense?

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