WCF体验之旅(11):再谈WCF的双向通讯-基于Http的双向通讯V.S.基于TCP的双向通讯(1)

using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
namespace Artech.DuplexWCF.Contract
{
[ServiceContract(CallbackContract = typeof(ICallback))]
public interface ICalculator
{
[OperationContract(IsOneWay = true)]
void Add(double x, double y);
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
namespace Artech.DuplexWCF.Contract
{
[ServiceContract]
public interface ICallback
{
[OperationContract(IsOneWay = true)]
void DisplayResult(double result);
}
}

using System;
using System.Collections.Generic;
using System.Text;
using Artech.DuplexWCF.Contract;
using System.ServiceModel;
namespace Artech.DuplexWCF.Service
{
public class CalculatorService:ICalculator
{
ICalculator Members#region ICalculator Members
public void Add(double x, double y)
{
double result = x + y; 
ICallback callback = OperationContext.Current.GetCallbackChannel();
callback.DisplayResult(result);
}
#endregion
}
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>        
<services>
<service name="Artech.DuplexWCF.Service.CalculatorService">
<endpoint address="net.tcp://localhost:9999/calculator"  binding="netTcpBinding" 
contract="Artech.DuplexWCF.Contract.ICalculator" />                
</service>
</services>
</system.serviceModel>
</configuration>