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(1,2);
                   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>