async callback z

public class StackOverflow_5979252
{
[ServiceContract(Name = "IMessageCallback")]
public interface IAsyncMessageCallback
{
[OperationContract(AsyncPattern = true)]
IAsyncResult BeginOnMessageAdded(string msg, DateTime timestamp, AsyncCallback callback, object asyncState);
void EndOnMessageAdded(IAsyncResult result);
}
[ServiceContract(CallbackContract = typeof(IAsyncMessageCallback))]
public interface IMessage
{
[OperationContract]
void AddMessage(string message);
}
[ServiceBehavior(IncludeExceptionDetailInFaults = true, ConcurrencyMode = ConcurrencyMode.Multiple)]
public class Service : IMessage
{
public void AddMessage(string message)
{
IAsyncMessageCallback callback = OperationContext.Current.GetCallbackChannel<IAsyncMessageCallback>();
callback.BeginOnMessageAdded(message, DateTime.Now, delegate(IAsyncResult ar)
{
callback.EndOnMessageAdded(ar);
}, null);
}
}
class MyClientCallback : IAsyncMessageCallback
{
public IAsyncResult BeginOnMessageAdded(string msg, DateTime timestamp, AsyncCallback callback, object asyncState)
{
Action<string, DateTime> act = (txt, time) => { Console.WriteLine("[{0}] {1}", time, txt); };
return act.BeginInvoke(msg, timestamp, callback, asyncState);
}
public void EndOnMessageAdded(IAsyncResult result)
{
Action<string,DateTime> act = (Action<string,DateTime>)((System.Runtime.Remoting.Messaging.AsyncResult)result).AsyncDelegate;
act.EndInvoke(result);
}
}
static Binding GetBinding()
{
return new NetTcpBinding(SecurityMode.None);
}
public static void Test()
{
string baseAddress = "net.tcp://" + Environment.MachineName + ":8000/Service";
ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress));
host.AddServiceEndpoint(typeof(IMessage), GetBinding(), "");
host.Open();
Console.WriteLine("Host opened");
InstanceContext instanceContext = new InstanceContext(new MyClientCallback());
DuplexChannelFactory<IMessage> factory = new DuplexChannelFactory<IMessage>(instanceContext, GetBinding(), new EndpointAddress(baseAddress));
IMessage proxy = factory.CreateChannel();
proxy.AddMessage("Hello world");
Console.Write("Press ENTER to close the host");
Console.ReadLine();
((IClientChannel)proxy).Close();
factory.Close();
host.Close();
}
}