合同需要Duplex，但Binding'BasicHttpBinding'不支持它，或者没有正确配置以支持它

Question

我创建了一个wcf服务，但是当我尝试更新服务引用时，它总是会给出这个异常，“Contract需要Duplex，但Binding'BasicHttpBinding'不支持它，或者没有正确配置以支持它。”

以下是我的web.config文件

<?xml version="1.0"?>
<configuration>

<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<bindings>
  <wsDualHttpBinding>
    <binding name="myBinding"       clientBaseAddress="http://localhost:18528/BankService/Service.svc">
      <security mode="None"/>
    </binding>
  </wsDualHttpBinding>
</bindings>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true">
  <baseAddressPrefixFilters>
    <add prefix="http://localhost:18528/BankService/Service.svc"/>
  </baseAddressPrefixFilters>
</serviceHostingEnvironment>
<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"/>
      <dataContractSerializer maxItemsInObjectGraph="999999999"/>
      </behavior>
  </serviceBehaviors>
</behaviors>
<services>
  <service name="BankService">
    <endpoint address="" binding="wsDualHttpBinding" contract="BankService.IBankService" bindingConfiguration="myBinding"
                name="HttpEndPoint">
    </endpoint>
    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
  </service>
</services>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
 </system.webServer>

</configuration>

由于我已经指定了一个wsDualHttpBinding，当我尝试更新服务引用时它仍然会出现此异常。

当我在整个解决方案中查找“BasicHttpBinding”关键字时，我在configuration.svcinfo和configuration91.svcinfo中找到它们。

任何机构都可以给我解决方案，谢谢。