服务端类代码

服务契约：

[ServiceContract(CallbackContract=typeof(IserviceCallBack))]    public interface IService1    {        [OperationContract]        string GetData(int value);    }    public interface IserviceCallBack    {        [OperationContract]        string GetClientData();    }

 

服务实例：

[ServiceBehavior(ConcurrencyMode=ConcurrencyMode.Reentrant)]    public class Service1 : IService1    {        public string GetData(int value)        {            IserviceCallBack callback = OperationContext.Current.GetCallbackChannel
     
      ();            string value1= callback.GetClientData();            return string.Format("You entered: {0} and CallValue is {1}", value,value1);        }    }
     

由于在方法中调用客户端的结果，所以使用重入

客户端代码

class CallBack : IService1Callback    {        public string GetClientData()        {            return "test callback value";        }    }    class Program    {        static void Main(string[] args)        {            Service1Client client = new Service1Client(new InstanceContext(new CallBack()));            Console.Write(client.GetData(1));            Console.Read();        }     }

结果是：You entered: 1 and CallValue is test callback value