A question regarding the web services and Silverlight. Would you be able to shed some light on why there is no support for WSHttpBinding in Silverlight please?

Thank you,

Yosh

posted by SDFusion

Silverlight supports a good subset of BasicHttpBinding functionality. The major value add of WSHttpBinding over BasicHttpBinding is supoport for WS-Security and WS-ReliableMessaging. Given substantial demand, we are looking into enabling a subset of WS-Security capabilities in the future release of Silverlight. 

Thanks,

Tomasz Janczuk

posted by tjanczuk

Thank you very much,

Yosh

posted by SDFusion

posted by chanmm

I wonder which particular security features from WSHttpBinding you are interested in?

posted by tjanczuk

posted by tjanczuk

..Ben

posted by Ben Hayat

Thanks!

..Ben

posted by Ben Hayat

Does the WCF duplex communication with Silverlight work in a web farm and on Azure?

Regards,

James.

posted by JSkimming

I've found a previous blog of yours, which described a potential solution in SL3 and presumably .NET 3.5 WCF.

http://tomasz.janczuk.org/2009/09/scale-out-of-silverlight-http-polling.html

I'm wondering whether it now works out-of-the-box with SL4 and .NET 4, or does it still require the solution in your post I've linked to.

Regards,

James.

posted by JSkimming

posted by deepeshm

scale out of the WCF service exposed with the http polling duplex binding in a web farm (Azure or otherwise) is challenging due to the internal design of the server side implementation. Check out http://tomasz.janczuk.org/2009/09/scale-out-of-silverlight-http-polling.html for more details on the topic.

Thanks,

Tomasz 

posted by tjanczuk

posted by uforualways

I am very new to programming and I am going through this demo, building it from scratch from your video using Visual Web Developer 2020 Express. I am running Silverlight 4 on Windows XP.  I get to the end of building the server WCF service, press <F5> to run the project. All is well until I try to access the Meta Data by typing the ChatService.svc URL on my localhost. Then I get the error message

"Configuration binding extension 'system.serviceModel/bindings/pollingDuplex' could not be found. Verify that this binding extension is properly registered in system.serviceModel/extensions/bindingExtensions and that it is spelled correctly."

I gathered from other posts on your blogsite that this is a common problem. I have de-installed and re-installed silverlight to no avail. Any thoughts? What am I doing wrong?

posted by Detox

posted by Detox

<pollingDuplex>
        <binding name="myPollingDuplex" duplexMode="MultipleMessagesPerPoll" receiveTimeout="00:30:00"/>
</pollingDuplex>

posted by Detox

posted by Virtual

posted by Pictoria

posted by Linh

posted by Birol

posted by GeordieJ

posted by gongchengshi

posted by Vijay

posted by Mohammad

Exception: System.ServiceModel.ServiceActivationException: The service '/DuplexService1/Service1.svc' cannot be activated
due to an exception during compilation.  The exception message is: Security settings for this service require 'Anonymous'
 Authentication but it is not enabled for the IIS application that hosts this service.. ---> System.NotSupportedException: Security
settings for this service require 'Anonymous' Authentication but it is not enabled for the IIS application that hosts this service.

Now we also tried building a CustomBinding

<system.serviceModel>
    <!-- Register the binding extension from the SDK. -->
    <extensions>
      <bindingElementExtensions>
        <add name="pollingDuplex" type="System.ServiceModel.Configuration.PollingDuplexElement, System.ServiceModel.PollingDuplex"/>
      </bindingElementExtensions>
      <bindingExtensions>
                <add name="pollingDuplexHttpBinding" type="System.ServiceModel.Configuration.PollingDuplexHttpBindingCollectionElement,System.ServiceModel.PollingDuplex, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
      </bindingExtensions>
    </extensions>
    <!-- Create the polling duplex binding. -->
    <bindings>
       <customBinding>
        <binding name="pollingBindingConfig" closeTimeout="00:01:05" openTimeout="00:01:05" receiveTimeout="00:01:10" sendTimeout="00:01:10">
          <binaryMessageEncoding maxReadPoolSize="64" maxWritePoolSize="16"
            maxSessionSize="2048">
            <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
              maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          </binaryMessageEncoding>
          <pollingDuplex maxPendingSessions="2147483647"
                         maxPendingMessagesPerSession="2147483647" />

          <httpTransport manualAddressing="false" maxBufferPoolSize="524288"
            maxReceivedMessageSize="65536" allowCookies="false" authenticationScheme="Negotiate"
            bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
            keepAliveEnabled="true" maxBufferSize="65536" proxyAuthenticationScheme="Negotiate"
            realm="" transferMode="Buffered" unsafeConnectionNtlmAuthentication="false"
            useDefaultWebProxy="true" />
        </binding>
      </customBinding>

    </bindings>

    <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="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service name="DuplexService1.OrderService">

        <!-- Service Endpoints -->
        <endpoint address="" binding="customBinding"  bindingConfiguration="pollingBindingConfig" contract="DuplexService1.IDuplexService">
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>

again the same result. The other curious thing is the that the SL ClientConfig file is always empty.(<configuration />. Surely SL Duplex communications does not
require Anonymous auth to be on or we are up the creek.

posted by jmcfet

posted by jmcfet

This really helped me as we needed more like Jeff is doing as we wanted our SL UI to repond to server progress events and the duplexMode="MultipleMessagesPerPoll" was causing my responses to be buffered so it looked like they were not working. Looking at Jeffs example cleared the air. It worked fine after converting project to SL4

posted by jmcfet

posted by OMAR OLGUIN

posted by Fernando vergara

I'm trying to write a subscription service similar to this chat service.  Below is my web.config:

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

<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<extensions>
<bindingElementExtensions>
<add name="pollingDuplex" type="System.ServiceModel.Configuration.PollingDuplexHttpBindingElement, System.ServiceModel.PollingDuplex, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</bindingElementExtensions>
</extensions>
<bindings>
<customBinding>
<binding name="MAD.ChangeNotificationServices.SubscriptionService.customBinding0">
<binaryMessageEncoding />
<pollingDuplex duplexMode="MultipleMessagesPerPoll"></pollingDuplex>
<httpTransport />
</binding>
</customBinding>
</bindings>
<services>
<service name="MAD.ChangeNotificationServices.SubscriptionService">
<endpoint address="" binding="customBinding" bindingConfiguration="MAD.ChangeNotificationServices.SubscriptionService.customBinding0"
contract="MAD.ChangeNotificationServices.ISubscriptionService" />
<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"/>
<serviceThrottling maxConcurrentSessions="2147483647"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"
multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>

</configuration>

When I use SingleMessagePerPoll as my duplex mode, everything works fine.  But when I switch to MultipleMessagesPerPoll, calls to the subscription service result in an operation timeout after 1 minute.  If I place a break point in the method I am calling in the subscription service, the break point is never hit.  Do you have any wisdom to share?

posted by RaySaltrelli