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copied!<p>What binding are you using? In the SSCCE below the context is not null on the callback implementation.</p> <pre><code>public class StackOverflow_15769719 { [ServiceContract(CallbackContract = typeof(ICallback))] public interface ITest { [OperationContract] string Hello(string text); } [ServiceContract] public interface ICallback { [OperationContract(IsOneWay = true)] void OnHello(string text); } public class Service : ITest { public string Hello(string text) { ICallback callback = OperationContext.Current.GetCallbackChannel<ICallback>(); ThreadPool.QueueUserWorkItem(delegate { callback.OnHello(text); }); return text; } } class MyCallback : ICallback { AutoResetEvent evt; public MyCallback(AutoResetEvent evt) { this.evt = evt; } public void OnHello(string text) { Console.WriteLine("[callback] Headers: "); foreach (var header in OperationContext.Current.IncomingMessageHeaders) { Console.WriteLine("[callback] {0}", header); } Console.WriteLine("[callback] OnHello({0})", text); evt.Set(); } } public static void Test() { bool useTcp = false; string baseAddress = useTcp ? "net.tcp://" + Environment.MachineName + ":8000/Service" : "http://" + Environment.MachineName + ":8000/Service"; ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress)); Binding binding = useTcp ? (Binding)new NetTcpBinding(SecurityMode.None) : new WSDualHttpBinding(WSDualHttpSecurityMode.None) { ClientBaseAddress = new Uri("http://" + Environment.MachineName + ":8888/Client") }; host.AddServiceEndpoint(typeof(ITest), binding, ""); host.Open(); Console.WriteLine("Host opened"); AutoResetEvent evt = new AutoResetEvent(false); MyCallback callback = new MyCallback(evt); DuplexChannelFactory<ITest> factory = new DuplexChannelFactory<ITest>( new InstanceContext(callback), binding, new EndpointAddress(baseAddress)); ITest proxy = factory.CreateChannel(); Console.WriteLine(proxy.Hello("foo bar")); evt.WaitOne(); ((IClientChannel)proxy).Close(); factory.Close(); Console.Write("Press ENTER to close the host"); Console.ReadLine(); host.Close(); } } </code></pre>

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