我需要在web.config中修复什么才能使这个MSDN示例正常工作？

Question

在Visual 2010中使用.NET 4和Silverlight 4，我试图按照MSDN指南为Silverlight客户端(http://msdn.microsoft.com/en-us/library/cc645027(v=vs.96).aspx )构建一个双工服务。

Web.config发出警告：

警告26元素“绑定”具有无效的子元素“pollingDuplexHttpBinding”。可能需要的元素列表：'basicHttpBinding，customBinding，msmqIntegrationBinding，netPeerTcpBinding，netMsmqBinding，netNamedPipeBinding，netTcpBinding，wsFederationHttpBinding，ws2007FederationHttpBinding，wsHttpBinding，ws2007HttpBinding，wsDualHttpBinding，netTcpContextBinding，wsHttpContextBinding，basicHttpContextBinding，mexHttpBinding，mexHttpsBinding，mexHttpBinding，webHttpBinding‘。C:\DuplexService\DuplexService\Web.config

我无法将服务引用添加到客户端。我无法在WCF测试客户端中加载该服务。我在很多地方都找过答案。我不知道问题出在哪里。

当前的web.config如下所示：

​

<!-- Register the binding extension from the SDK. -->
<extensions>
  <bindingExtensions>
    <add name=
        "pollingDuplexHttpBinding"
        type="System.ServiceModel.Configuration.PollingDuplexHttpBindingCollectionElement,System.ServiceModel.PollingDuplex, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
  </bindingExtensions>
</extensions>

<bindings>
  <!-- Create the polling duplex binding. -->
  <pollingDuplexHttpBinding>
    <binding name="multipleMessagesPerPollPollingDuplexHttpBinding"
             duplexMode="MultipleMessagesPerPoll"
             maxOutputDelay="00:00:07"/>
  </pollingDuplexHttpBinding>
</bindings>

<services>
  <service name="DuplexService.OrderService"
     behaviorConfiguration="DuplexService.OrderServiceBehavior">

    <!-- Service Endpoints -->
    <endpoint
       address=""
       binding="pollingDuplexHttpBinding"
       bindingConfiguration="multipleMessagesPerPollPollingDuplexHttpBinding"
       contract="DuplexService.IDuplexService">
    </endpoint>
    <endpoint
        address="mex"
        binding="mexHttpBinding"
        contract="IMetadataExchange"/>
  </service>
</services>

<behaviors>
  <serviceBehaviors>
    <behavior>
      <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
      <serviceMetadata httpGetEnabled="true"/>
      <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
      <serviceDebug includeExceptionDetailInFaults="false"/>
    </behavior>
  </serviceBehaviors>
</behaviors>

<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />

​

​

Answer 1

我也有过这个问题。通过添加

C:\Program Files (x86)\Microsoft SDKs\Silverlight\v4.0\Libraries\Server\System.ServiceModel.PollingDuplex.dll

对WebRole项目的引用。

Answer 2

用这个配置..。对我来说很管用。

<system.serviceModel>
<extensions>
  <bindingElementExtensions>
    <add name="pollingDuplex"
         type="System.ServiceModel.Configuration.PollingDuplexElement, 
         System.ServiceModel.PollingDuplex" />
  </bindingElementExtensions>
</extensions>
<bindings>
  <customBinding>
    <binding name="pollingDuplexBinding">
      <binaryMessageEncoding />
      <pollingDuplex maxPendingSessions="2147483647"   
                     maxPendingMessagesPerSession="2147483647" 
                     />
      <httpTransport />
    </binding>
  </customBinding>
</bindings>

<behaviors>
  <serviceBehaviors>
    <behavior name="sb">
      <serviceMetadata httpGetEnabled="true"/>
      <serviceDebug includeExceptionDetailInFaults="false"/>
      <serviceThrottling maxConcurrentSessions="2147483647"/>
    </behavior>
  </serviceBehaviors>
</behaviors>
<services>
  <service name="DataServices" behaviorConfiguration="sb" >
    <endpoint address="" 
              binding="customBinding" 
              bindingConfiguration="pollingDuplexBinding"
              contract="DataServices.IDataService"/>
    <endpoint address="mex" 
              binding="mexHttpBinding" 
              contract="IMetadataExchange"/>
  </service>
</services>