[Mono-dev] dataContractSerializer service behavior causes InvalidCastException

[Uli Hertlein]

Hi guys,

after making some changes to my app.config file to allow WCF to 
serialize larger graphs I'm getting an InvalidCastException when running 
on mono.

ProxyTask: System.InvalidCastException: Cannot cast from source type to 
destination type.
   at System.ServiceModel.ServiceHostBase.AddServiceBehaviors 
(System.String configurationName, Boolean throwIfNotFound) [0x00000] in 
<filename unknown>:0
   at System.ServiceModel.ServiceHostBase.ApplyServiceElement 
(System.ServiceModel.Configuration.ServiceElement service) [0x00000] in 
<filename unknown>:0
   at System.ServiceModel.ServiceHostBase.LoadConfigurationSection 
(System.ServiceModel.Configuration.ServiceElement element) [0x00000] in 
<filename unknown>:0
   at System.ServiceModel.ServiceHostBase.ApplyConfiguration () 
[0x00000] in <filename unknown>:0
   at System.ServiceModel.ServiceHostBase.InitializeDescription 
(System.ServiceModel.UriSchemeKeyedCollection baseAddresses) [0x00000] 
in <filename unknown>:0
   at System.ServiceModel.ServiceHost.InitializeDescription (System.Type 
serviceType, System.ServiceModel.UriSchemeKeyedCollection baseAddresses) 
[0x00000] in <filename unknown>:0
   at System.ServiceModel.ServiceHost..ctor (System.Type serviceType, 
System.Uri[] baseAddresses) [0x00000] in <filename unknown>:0

The offending line in my 'app.config' is this:

<configuration>
   <system.serviceModel>
     <behaviors>
       <serviceBehaviors>
         <behavior name="ProxyBehavior">
           <!-- Mono does not like this at all. -->
           <!--
           <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
           -->
           <serviceMetadata httpGetEnabled="true"/>
         </behavior>
       </serviceBehaviors>
     </behaviors>
     <services>
       <service behaviorConfiguration="ProxyBehavior" name="Proxy">
         <endpoint
             address=""
             binding="basicHttpBinding"
             bindingConfiguration="ProxyBasicHttpBinding"
             contract="IProxy" />
       </service>
     </services>
   </system.serviceModel>
</configuration>

The recipe for this comes from 
http://smehrozalam.wordpress.com/2009/01/29/retrieving-huge-amount-of-data-from-wcf-service-in-silverlight-application

My guess so far is that DataContractSerializerOperationBehavior is 
implementing IOperationBehavior and IWsdlExportExtension, there doesn't 
seem to be anything implemented related to ServiceBehavior.

Any WCF gurus out there that may have an idea what's happening?

Cheers,
/uli