Async Exception with WCF - Silverlight

[Member 4584312]

I have developed a Workflow and published it as WCF webservice on IIS. The ServiceReference.ClientConfig contains the following binding for each webservice:

        <customBinding>
   <binding name="CustomBinding\_IListValue">
                <binaryMessageEncoding />
                <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" />
            </binding>

....
</customBinding>

    </bindings>

    <client>
        <endpoint address="http://IPAddress/MyService/GetListValue.svc"
            binding="customBinding" bindingConfiguration="CustomBinding\_IListValue"
            contract="SRListValue.IListValue" name="CustomBinding\_IListValue" />

....
</client>

I then created a Silverlight 3 webapplication that references the published svc webservice. The crossdomain.xml and clientaccesspolicy.xml are in the wwwroot of the webserver. When calling the silverlight webapplication, the call sometimes works perfectly and sometimes give the Async_Exception. We monitored it through Fidler and it sometimes gives the 500 http error that doesn't say much and sometimes it passes through. We have been struggling with this for a week now. Appreciate any help in the matter. Thanks Grace

[Mark Salsbery]

I have no experience with WF, but is it possible to run the server or attach to the server process with the debugger? I would think there's an (unhandled) exception occurring on the server...

Mark Salsbery Microsoft MVP - Visual C++ :java:

[Member 4584312]

Thanks Mark... But how can I do that? I have actually tried to comment all the code inside the WF functions so they would just do nothing. And still they were giving the Async Exception occasionally ...

[Mark Salsbery]

Can you post the <system.serviceModel> section of the server side's web.config?

Mark Salsbery Microsoft MVP - Visual C++ :java:

[Member 4584312]

Here it is:

<system.serviceModel>
<bindings>
<customBinding>
<binding name="customBinding0">
<binaryMessageEncoding />
<httpTransport />
</binding>
</customBinding>
</bindings>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
<services>

  <service behaviorConfiguration="WcfService.ServiceBehavior" name="MyAPP\_WF\_WCF.WF.Infrastructure.ListValueWF">
    <endpoint address="" binding="customBinding" bindingConfiguration="customBinding0"
     contract="MyAPP\_WF\_WCF.Interfaces.Infrastructure.IListValue" />
    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
    <host>
      <baseAddresses>
        <add baseAddress="http://localhost:8731/Design\_Time\_Addresses/MyAPP\_WF\_WCF/WF/Infrastructure/ListValueWF/" />
      </baseAddresses>
    </host>
  </service>

 .....


</services>
<behaviors>
  <serviceBehaviors>
    <behavior name="WcfService.ServiceBehavior">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug includeExceptionDetailInFaults="false" />
    </behavior>
    <behavior name="MyAPP\_WF\_WCF.Workflow1Behavior">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug includeExceptionDetailInFaults="true" />
      <serviceCredentials>
        <windowsAuthentication includeWindowsGroups="true" allowAnonymousLogons="false" />
      </serviceCredentials>
    </behavior>
  </serviceBehaviors>
  
</behaviors>

</system.serviceModel>

[Mark Salsbery]

You've only shown one service. If that's the service that is returning an error occasionally: 1) Set the includeExceptionDetailInFaults to true so you get more info with the HTTP 500 response. 2) Based on the baseAddress, it looks like you're already hosting it in the development environment. You should be able to start the service in the debugger!

Mark Salsbery Microsoft MVP - Visual C++ :java:

[avnerpeer]

Hello Mark , I having the same problem!!! All asinc methods rais an exception , either if they are signed in comment. It started sudenlly. any Ideas?

[avnerpeer]

I have developed a Workflow and published it as WCF webservice on IIS. I then created a Silverlight 3 webapplication that references the published svc webservice. The clientaccesspolicy.xml is in the wwwroot of the webserver. When calling the silverlight webapplication, the call sometimes works perfectly and sometimes give the Async_Exception. We have been struggling with this for a week now. Appreciate any help in the matter. Thanks !