MEF and GlobalCache

Hello

I am having an issue with the MEF instantiation of the IGlobalCache class (from TempHire) when defined as a parameter to a ViewModel constructor. To illustrate I have created a very simple test application (attached). It contains one viewmodel (no associated view as it is unimportant at this stage), the IGlobalCache interface and derived class GlobalCache and a Entity model obtained by a few tables from the Adventureworks 2008 R2 sample database from Microsoft.

The ViewModel in question (MyTestViewModel) has a constructor of:

[ImportingConstructor]

public MyTestViewModel(IGlobalCache oface){}

And the Bootstrapper is set to launch MyTestViewModel. However, when the application runs I get the error message "Could not locate any instances of contract Test.ViewModels.MyTestViewModel.".

I note that when I change the constructor of the GlobalCache class from this:

// this does not work

[ImportingConstructor]

public GlobalCache([Import(RequiredCreationPolicy = CreationPolicy.NonShared)] IEntityManagerProvider<AdventureWorks2008R2Entities> entityManagerProvider)

{

_entityManagerProvider = entityManagerProvider;

}

To this:

[ImportingConstructor]

public GlobalCache()

{

}

Then the error goes away and the application runs, however the entityManagerProvider is obviously not set and hence the GlobalCache is of somewhat limited use.

Any ideas what I am not doing correctly?

Thanks

Mark