Silverlight PollingDuplex InnerChannel出现故障,出现多个MessagesPerPoll(serverPollTimeout)

Im运行silverlight客户端版本4.0.50917.0和SDK版本4.0.50826.1

我针对wcf pollingduplex绑定创建了一个简单的silverlight客户端:

Web.config:

<system.serviceModel>
<extensions>
  <bindingExtensions>
    <add name="pollingDuplexHttpBinding"
        type="System.ServiceModel.Configuration.PollingDuplexHttpBindingCollectionElement,System.ServiceModel.PollingDuplex, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
  </bindingExtensions>
</extensions>
<behaviors>
  <serviceBehaviors>
    <behavior name="sv">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug includeExceptionDetailInFaults="true" />
      <serviceThrottling maxConcurrentSessions="2147483647"/>
    </behavior>
  </serviceBehaviors>
</behaviors>

<bindings>
  <!-- Create the polling duplex binding. -->
  <pollingDuplexHttpBinding>
    <binding name="multipleMessagesPerPollPollingDuplexHttpBinding"
             duplexMode="MultipleMessagesPerPoll"
             maxOutputDelay="00:00:01"/>

    <binding name="singleMessagePerPollPollingDuplexHttpBinding"
             maxOutputDelay="00:00:01"/>
  </pollingDuplexHttpBinding>
</bindings>
<services>
  <service behaviorConfiguration="sv" name="Backend.GUIPollingService">
    <endpoint address="" binding="pollingDuplexHttpBinding" bindingConfiguration="singleMessagePerPollPollingDuplexHttpBinding"
      contract="Backend.IGUIPollingService" />
    <endpoint address="mmpp" binding="pollingDuplexHttpBinding" bindingConfiguration="multipleMessagesPerPollPollingDuplexHttpBinding"
      name="multimessage" contract="Backend.IGUIPollingService" />
    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
  </service>
</services>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />

我的silverlight客户端连接如下:

 string endPointAddress2 = "http://"
          + App.Current.Host.Source.DnsSafeHost
          + ":"
          + App.Current.Host.Source.Port.ToString(CultureInfo.InvariantCulture)
          + "/GUIPollingService.svc/mmpp";
 this.client = new GUIClientProxy.GUIPollingServiceClient(
        new PollingDuplexHttpBinding(PollingDuplexMode.MultipleMessagesPerPoll), 
        new EndpointAddress(endPointAddress2))

我有一个内部通道故障的事件处理程序:

client.InnerChannel.Faulted += new EventHandler(InnerChannel_Faulted);

...

void InnerChannel_Faulted(object sender, EventArgs e)
    {

        Dispatcher.BeginInvoke(() =>
        { status.Text += "Inner channel Faulted\n\n"
        }
    } 

当使用上面的Client.InnerChannelFaulted事件正好发生在 一 serverPollTimeout . (默认15秒,用Fiddler验证)

如果我将我的客户端切换为这样的连接:

string endPointAddress2 = "http://"
          + App.Current.Host.Source.DnsSafeHost
          + ":"
          + App.Current.Host.Source.Port.ToString(CultureInfo.InvariantCulture)
          + "/GUIPollingService.svc";
 this.client = new GUIClientProxy.GUIPollingServiceClient(
        new PollingDuplexHttpBinding(), 
        new EndpointAddress(endPointAddress2))

每个投票的aka单个消息fiddler显示 服务器轮询超时 开始新的投票,频道 不 出现故障。

有什么问题吗?

编辑:

我读过 http://social.msdn.microsoft.com/Forums/en/wcf/thread/1e6aa407-4446-4d4a-8dac-5392250814b8 和 http://forums.silverlight.net/forums/p/200659/468206.aspx#468206 我也同意“单条消息投票”不是一个体面的解决办法。正如您在我的版本中看到的,我运行的是最新版本的SDK和developer runtime。

编辑2:

我刚刚发现,如果我使用谷歌浏览器而不是IE8多消息浏览器可以很好的工作!对我来说这闻起来像是一个运行时对ie8的错误?

编辑3:

silverlight WS博客上的确认消息: http://blogs.msdn.com/b/silverlightws/archive/2010/12/15/pollingduplex-using-multiplemessagesperpoll-issue-in-latest-sl4-gdrs.aspx