Question

我遇到一些问题，我的netTcpBinding WCF客户端/服务器正在使用回调。这是代码...任何想法？

服务方

合同：

using System.Runtime.Serialization;
using System.ServiceModel;

namespace API.Interface
{
   [ServiceContract(CallbackContract = typeof(IServiceCallback))]
   public interface IMyService
   {
       [OperationContract]
       void DoSomething();
   }

   public interface IServiceCallback
   {
        [OperationContract(IsOneWay = true)]
        void OnCallback();
   }
}

服务：

using System;
using System.Security.Cryptography.X509Certificates;
using System.ServiceModel;
using System.Timers;
using API.Interface;

namespace API.Service
{
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Reentrant)]
    public class MyService : IMyService
    {
        public static IServiceCallback callback;
        public static Timer Timer;

        public void DoSomething()
        {
            Console.WriteLine("> Session opened at {0}", DateTime.Now);
            callback = OperationContext.Current.GetCallbackChannel<IServiceCallback>();

            Timer = new Timer(1000);
            Timer.Elapsed += OnTimerElapsed;
            Timer.Enabled = true;

        }

        void OnTimerElapsed(object sender, ElapsedEventArgs e)
        {
            callback.OnCallback();
        }
    }
}

以下是我用来启动服务的代码

        var service = new MyService();
        // Start up the WCF API
        var service = new ServiceHost(turboService);
        service.Open();

这是App.Config

   <system.serviceModel>
    <services>
      <service name="API.Service.MyService">
        <endpoint address="" binding="netTcpBinding" bindingConfiguration=""
          contract="API.Interface.IMyService">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration=""
          contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="net.tcp://localhost:8732/MyService/"/>
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="">
          <serviceMetadata httpGetEnabled="false" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

客户端

CallbackService

using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using System.Text;
using USBAutomationTester.ServiceReference;

namespace USBAutomationTester
{
    [CallbackBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant, UseSynchronizationContext = false)]
    public class CallbackService : IMyServiceCallback
    {
        public void OnCallback()
        {
            Console.WriteLine("> Received callback at {0}", DateTime.Now);
        }
    }
}

连接并致电

 var instanceContext = new InstanceContext(new CallbackService());
 var service = new TurboValidateServiceClient(instanceContext);
 service.DoSomething();

App.Config中

  <system.serviceModel>
    <bindings>
      <netTcpBinding>
        <binding name="NetTcpBinding_IMyService" />
      </netTcpBinding>
    </bindings>
    <client>
      <endpoint address="net.tcp://localhost:8732/MyService/"
        binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ITurboValidateService"
        contract="ServiceReference.IMyService"
        name="NetTcpBinding_IMyService">
        <identity>
          <dns value="localhost" />
        </identity>
      </endpoint>
    </client>
  </system.serviceModel>

我相信我拥有所需的一切。谷歌搜索让我走上了几条不同的道路而没有真正的结果。我可以看到服务调用回调，但我的客户端永远不会得到它。

在此先感谢，我知道这是一个WCF 101类型的问题，但我现在很难过。

更新

在客户端上，我收到此异常

“无法处理带有操作的传入邮件，因为它的目标是请求 - 回复操作，但由于未设置MessageId属性，因此无法回复。”

接着是

“关闭时，频道收到了带有操作'http://tempuri.org/IMyService/OnCallback'的意外输入消息。您应该只在不期待任何输入消息时关闭频道。”

Answer 1

可能问题在于，当计时器触发时，上下文已经关闭。

    public void DoSomething()
    {
        Console.WriteLine("> Session opened at {0}", DateTime.Now);
        callback = OperationContext.Current.GetCallbackChannel<IServiceCallback>();

        Timer = new Timer(1000);
        Timer.Elapsed += OnTimerElapsed;
        Timer.Enabled = true;

    }

    void OnTimerElapsed(object sender, ElapsedEventArgs e)
    {
        callback.OnCallback();
    }

尝试将回调转换为ICommunicationObject并检查State属性。如果您在尝试Open时未设置为OnCallback，那就是您的问题。

获取WCF回调以使用netTcpBinding

1 个答案: