Implementing ServiceProxyEvents throws "Cannot find ObjectServer or default ServiceKey"

It works fine with my current app.config (client) and web.config(BOS).

Now I have requirement to allow my winform-client to change the BOS address. Thus I'm implementing IdeaBlade.EntityModel.ServiceProxyEvents based on http://drc.ideablade.com/devforce-2012/bin/view/Documentation/code-sample-custom-client-configuration.

And now the winfom-client always throws "System.InvalidOperationException: Cannot find ObjectServer or default ServiceKey" when I create a new instance of a DomainModelEntityManager.

Did I miss anything in the implementation? Is there any part of the app.config that I need to modify?
I put a breakpoint at the constructor of my derived class of ServiceProxyEvents, i doest break there, but the two overriden method are never called.

here's the stacktrace:

IdeaBlade DevForce EntityManager error 

---> IdeaBlade.EntityModel.EntityServerException: Cannot find ObjectServer or default ServiceKey 

---> System.InvalidOperationException: Cannot find ObjectServer or default ServiceKey 

at IdeaBlade.Core.Configuration.ObjectServerElement.GetDefaultServiceKey() 

at IdeaBlade.Core.Configuration.ObjectServerElement.GetServiceKey(String name, Boolean throwIfNotFound) 

at IdeaBlade.EntityModel.DefaultClientProxy`1.GetServiceAddress() 

at IdeaBlade.EntityModel.WcfProxy`1.CreateProxyCore() 

at IdeaBlade.EntityModel.WcfProxy`1..ctor(String serviceName, String serviceKey, Boolean delayedCreation) 

at IdeaBlade.EntityModel.WcfProxyFactory.GetProxy[TContract](String serviceName, String serviceKey, String& address) 

at IdeaBlade.EntityModel.RemoteEntityServiceProxyBase`1.Initialize() 

at IdeaBlade.EntityModel.RemoteEntityServerProxyBase.Connect(ConnectAction action) 

at IdeaBlade.EntityModel.EntityManager.Connect() 

--- End of inner exception stack trace --- 

at IdeaBlade.EntityModel.EntityManager.HandleEntityServerException(Exception ex, Boolean tryToHandle, PersistenceOperation operation, Boolean throwOnError) 

at IdeaBlade.EntityModel.EntityManager.Connect() 

at IdeaBlade.EntityModel.EntityManager..ctor(EntityManagerContext context) 

at DomainModel.DomainModelEntityManager..ctor(Boolean shouldConnect, String dataSourceExtension, EntityServiceOption entityServiceOption, String compositionContextName)

 

You can change the service address in several ways:  in the app.config with either the ObjectServer or ServiceKey information, or in code by programmatically setting the corresponding IdeaBladeConfig.Instance information.  Implementing a custom ServiceProxyEvents will allow you to change the address too, but it's not as straightforward as the other means.

I cache the "System.ServiceModel.ChannelFactory" into a static variable when OnFactoryCreated() called in the user's first login attempt.

Before the user login for the second time, I call System.ServiceModel.ChannelFactory.Close(), this will force the OnEndpointCreated() to be called again when instantiating EntityManager.