WCF Custom Header with Silverlight

In my previous post “Client Additional Parameters using Custom Headers in WCF“, I discussed about passing additional parameters from client in SOAP header with WCF service by implementing IClientMessageInspector, IEndPointBehavior and BehaviorExtensionElement.

I am really glad to know that it help some of you. However, I have received some queries from readers for implementing custom headers with Silverlight client which I am going to discuss in this post.

While working on Silverlight client, we have limited framework available and to implement custom headers there are some slight changes:

1. Instead of App.config or Web.config, you have ServiceReference.ClientConfig
2. MessageHeader (Generic) class is not available instead you can use MessageHeader class
3. There is no BehaviorExtensionElement class available in Silverlight 4 Runtime
4. Since there is no BehaviorExtensionElement class, therefore you cannot define extension in .config file
5. You need to programmatically bind/add custom endpoint behavior

   1:  public class MyMessageInspector : IClientMessageInspector

   2:  {

   3:      #region IClientMessageInspector Members

   4:   

   5:      public void AfterReceiveReply(ref Message reply,

   6:                                      object correlationState)

   7:      {

   8:          Debug.WriteLine("SOAP Response: {0}", reply.ToString());

   9:      }

  10:   

  11:      public object BeforeSendRequest(ref Message request,

  12:                                      IClientChannel channel)

  13:      {

  14:          const string STR_Customer_Unique_Id = "Customer Unique Id: 12345";

  15:          var header = MessageHeader.CreateHeader("Identity", 

  16:                                                  "https://www.adilmughal.com", 

  17:                                                  STR_Customer_Unique_Id);

  18:          request.Headers.Add(header);

  19:          Debug.WriteLine("SOAP Request: {0}", request.ToString());

  20:          return null;

  21:      }

  22:      #endregion

  23:  }

   1:  public class CustomBehavior : IEndpointBehavior

   2:  {

   3:      #region IEndpointBehavior Members

   4:   

   5:      public void AddBindingParameters(ServiceEndpoint endpoint,

   6:                                          BindingParameterCollection bindingParameters)

   7:      {

   8:      }

   9:   

  10:      public void ApplyClientBehavior(ServiceEndpoint endpoint,

  11:                                      ClientRuntime clientRuntime)

  12:      {

  13:          clientRuntime.MessageInspectors.Add(new MyMessageInspector());

  14:      }

  15:   

  16:      public void ApplyDispatchBehavior(ServiceEndpoint endpoint,

  17:                                          EndpointDispatcher endpointDispatcher)

  18:      {

  19:      }

  20:   

  21:      public void Validate(

  22:          ServiceEndpoint endpoint)

  23:      {

  24:      }

  25:      #endregion

  26:  }

ServiceProxy.TestServiceClient proxy = new ServiceProxy.TestServiceClient();

proxy.Endpoint.Behaviors.Add(new CustomBehavior());