WCF回调操作

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <system.serviceModel>

      <services>

          <service name="Artech.DuplexServices.Services.CalculatorService">

              <endpoint address="net.tcp://127.0.0.1:9999/CalculatorService"

                        binding="netTcpBinding" contract="Artech.DuplexServices.Contracts.ICalculator"></endpoint>

          </service>

    </services>

  </system.serviceModel>

</configuration>

今天学习了WCF回调代码，可能的异常，注意点。

1.配置项的大小写要注意。

把配置项<endpoint address="net.tcp://127.0.0.1:9999/CalculatorService
      binding="netTcpbinding" contract="Artech.DuplexServices.Contracts.ICalculator"></endpoint>，红色部分没有注意大小写问题，导致了程序加载类异常。应该是binding="netTcpBinding"。

2.回调时不能关闭Tcp连接。

3.防止调用时的死锁。需要再契约上使用属性[OperationContract(IsOneWay=true)]。

源码地址：http://pan.baidu.com/s/1ntyP1ZN

框架图

原程序

Sevices

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Artech.DuplexServices.Contracts;

using System.ServiceModel;

namespace Artech.DuplexServices.Services

{

    public class CalculatorService : ICalculator

    {

        public void Add(double x, double y)

        {

            double result = x + y;

            ICallBack callback = OperationContext.Current.GetCallbackChannel<ICallBack>();

            callback.DispalayResult(x, y, result);

        }

    }

}

Contracts：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

namespace Artech.DuplexServices.Contracts

{

    [ServiceContract(Namespace="http://www.artech.com/",CallbackContract=typeof(ICallBack))]

    public interface ICalculator

    {

        [OperationContract(IsOneWay=true)]

        void Add(double x, double y);

    }

}

namespace Artech.DuplexServices.Contracts

{

    public interface ICallBack

    {

        [OperationContract(IsOneWay = true)]

        void DispalayResult(double x, double y, double result);

    }

}

Hosting，

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

using System.ServiceModel.Description;

using Artech.DuplexServices.Contracts;

using Artech.DuplexServices.Services;

using System.ServiceModel.Channels;

namespace Artech.DuplexServices.Hosting

{

    class Program

    {

        static void Main(string[] args)

        {

            using (ServiceHost host = new ServiceHost(typeof(CalculatorService)))

            {

                host.Open();

                Console.Read();

            }

        }

    }

}

App.config

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <system.serviceModel>

      <services>

          <service name="Artech.DuplexServices.Services.CalculatorService">

              <endpoint address="net.tcp://127.0.0.1:9999/CalculatorService"

                        binding="netTcpBinding" contract="Artech.DuplexServices.Contracts.ICalculator"></endpoint>

          </service>

    </services>

  </system.serviceModel>

</configuration>

ClientConsole

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Artech.DuplexServices.Contracts;

using System.ServiceModel;

using System.ServiceModel.Channels;

//system.serviceModel/bindings/netTcpbinding

namespace Artech.DuplexServices.Clients

{

    public class CalculateCallback : ICallBack

    {

        public void DispalayResult(double x, double y, double result)

        {

            Console.WriteLine("x+y={2} when x={0} and y={1}",x,y,result);

        }

    }

}

namespace Artech.DuplexServices.Clients

{

    class Program

    {

        static void Main(string[] args)

        {

            InstanceContext instanceContext = new InstanceContext(new CalculateCallback());

            using (DuplexChannelFactory<ICalculator> ChannelFactory = new DuplexChannelFactory<ICalculator>(

                instanceContext, "CalculatorService"))

            {

                ICalculator proxy = ChannelFactory.CreateChannel();

                using (proxy as IDisposable)

                {

                   proxy.Add(,);

                   Console.ReadLine();

                }

            }

        }

    }

}

ClientConsole-AppConfig

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <system.serviceModel>

    <client>

      <endpoint name="CalculatorService" address="net.tcp://127.0.0.1:9999/CalculatorService" binding="netTcpBinding"

                contract="Artech.DuplexServices.Contracts.ICalculator">

      </endpoint>

    </client>

  </system.serviceModel>

</configuration>