StackOverflow2013

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copied!<p>If there's no header with that name / namespace, you'll get an exception (<code>MessageHeaderException</code>) in the call to GetHeader. If you don't want to deal with exceptions, you can first see if such a header exists (using the <code>FindHeader</code> method), then if it returns a non-negative value, get the corresponding header.</p> <pre><code>public class StackOverflow_8854137 { [ServiceContract] public interface ITest { [OperationContract] string Echo(string text); } public class Service : ITest { public string Echo(string text) { return text; } } class MyBehavior : IEndpointBehavior, IDispatchMessageInspector { public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { } public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime) { } public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher) { endpointDispatcher.DispatchRuntime.MessageInspectors.Add(this); } public void Validate(ServiceEndpoint endpoint) { } public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext) { try { Guid tokenId = request.Headers.GetHeader<Guid>("Token", "System"); Console.WriteLine("Token: {0}", tokenId); } catch (Exception e) { Console.WriteLine("{0}: {1}", e.GetType().FullName, e.Message); } return null; } public void BeforeSendReply(ref Message reply, object correlationState) { } } public static void Test() { string baseAddress = "http://" + Environment.MachineName + ":8000/Service"; ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress)); ServiceEndpoint endpoint = host.AddServiceEndpoint(typeof(ITest), new BasicHttpBinding(), ""); endpoint.Behaviors.Add(new MyBehavior()); host.Open(); Console.WriteLine("Host opened"); ChannelFactory<ITest> factory = new ChannelFactory<ITest>(new BasicHttpBinding(), new EndpointAddress(baseAddress)); ITest proxy = factory.CreateChannel(); Console.WriteLine(proxy.Echo("No token")); using (new OperationContextScope((IContextChannel)proxy)) { OperationContext.Current.OutgoingMessageHeaders.Add(MessageHeader.CreateHeader("Token", "System", Guid.NewGuid())); Console.WriteLine(proxy.Echo("With token")); } ((IClientChannel)proxy).Close(); factory.Close(); Console.Write("Press ENTER to close the host"); Console.ReadLine(); host.Close(); } } </code></pre>

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