Getting an Object not set exception as I uncomment Export

 

Troubleshooting your application at this level, though, is beyond the scope of this forum. That would take significant time on my end, which I would have to bill for. I'm actually going to be in Germany and Switzerland next month. If you'd like to use some of our consulting services, we could work together and try to troubleshoot this over WebEx. At least we would be in the same timezone.

 

PartsCatalog:LoadCatalog : Error loading assembly 'C:\Projects\my\my\my\bin\Debug\mymainWPFapp.exe.manifest' for PartsCatalog: Error with file mymainWPFapp.exe.manifest.

I've taken this part from tempfire (I'm not in the office rigth now, can write you tomorrow morning but you'll be out of office!) to fix the first thing what should I do?

Thanks

 

You shouldn't trigger instantiation of an EntityManager in a constructor. When your constructor is called you'll be in the middle of MEF composition. The container isn't ready and your object graph hasn't finished constructing and composing. The EntityManager itself is trying to find things in the container. You may get lucky and it finds it or you may get very unlucky depending on your application's unique composition signature and get errors down the road in unexpected places. Constructors should ALWAYS be limited to trivial object initialization. Things as big and complex as an EntityManager should be lazy instantiated outside of the constructor.

 

Second, you shouldn't get your current user from Manager.Principal. This property is actually going to be deprecated in the next release of DevForce. It never should have been there. You should always get your current user from a service. See TempHire and search for IUserService to see an example. TempHire isn't currently consuming this service, but it demonstrates how to implement such a thing on top of the AuthenticationService. It would just inject IUserService into ViewModels that need the current user.

 

Also, don't store the user in your ViewModel. You may not be logged in at the time and eventually your application may support logout. Sooner or later you'll find yourself in a cleanup mess. Always get the principal fresh from the user service when you need it to make sure you get the correct current user.

 

You don't have to manually add all your repositories etc to the container. Just mark them with the [Export] attribute. This way if you add repositories etc. for new models, you don't have to constantly modify the bootstrapper. Look at how very little I have in the TempHire bootstrapper.

 

I recommend you take a deep look at TempHire and follow the patterns you see there. I have a feeling that you've gone down a dark rabbit hole.

 

2012-02-24 08:25:06  IdeaBlade.Core.Composition.CompositionHost:CheckSingleExport CompositionContext: '-IbDefault-' - Probed for default 'IDataSourceKeyResolver' and found 'IdeaBlade.EntityModel.DefaultDataSourceKeyResolver'.
2012-02-24 08:25:06  IdeaBlade.EntityModel.WcfProxy`1:CreateProxyCore Trying automatic configuration of EntityService
2012-02-24 08:25:07  IdeaBlade.EntityModel.RemoteServiceFns:AddSerializationBehavior Using DC serializer for EntityService
2012-02-24 08:25:07  IdeaBlade.Core.Composition.CompositionHost:CheckSingleExport CompositionContext: '-IbDefault-' - Probed for any 'ServiceProxyEvents' and found 'IdeaBlade.EntityModel.ServiceProxyEvents'.
2012-02-24 08:25:07  IdeaBlade.EntityModel.WcfProxy`1:CreateProxyCore Created proxy to EntityService using Uri http://localhost:9009/EntityService.svc
2012-02-24 08:25:10  IdeaBlade.EntityModel.WcfProxy`1:CreateProxyCore Trying automatic configuration of EntityServer
2012-02-24 08:25:10  IdeaBlade.EntityModel.KnownTypeHelper:<GetMarkedKnownTypes>b__13 Probed for known types and found my.DomainModel.IFUser
2012-02-24 08:25:10  IdeaBlade.Core.Composition.CompositionHost:CheckMultiExport CompositionContext: '-IbDefault-' - Probed for non-default 'IKnownTypeProvider' and found no matching exports.
2012-02-24 08:25:10  IdeaBlade.EntityModel.RemoteServiceFns:AddSerializationBehavior Using DC serializer for EntityServer
2012-02-24 08:25:10  IdeaBlade.EntityModel.WcfProxy`1:CreateProxyCore Created proxy to EntityServer using Uri http://localhost:9009/EntityServer.svc/
2012-02-24 08:25:12  Cocktail.PartLocator`1:WriteTrace Probed for service with contract IAuthenticationService and found my.Authentication.myAuthenticationService
2012-02-24 08:25:12  Cocktail.EntityManagerProviderBase`1:get_EntityManagerDelegates Probed for EntityManagerDelegate and found no matchting exports.
2012-02-24 08:25:12  Cocktail.PartLocator`1:WriteTrace Probed for service with contract IEntityManagerProvider`1 and found no matching exports

and as you've told before it doesn't find an IEntityManagerProvider.. I check why this happen

I'm not clear on whether you commented it out in TempHire or your own application. But TempHire no longer works if you comment it out there. The reason for that is the authentication service is injected in the ShellViewModel via the Cocktail IAuthenticationService interface. Furthermore, Cocktail looks for this interface to properly authenticate all EntityManagers, so you MUST export the AuthenticationService via IAuthenticationService. It doesn't work any other way.

 

Are you sure those log entries are from the most recent run? You have another issue there. It can't find an EntityManagerProvider. The AuthenticationService is gonna need an EntityManagerProvider to work.

 

Marcel