Allow sharing of DbContext when using ConfigurationBasedRepository or RepositoryFactory

[jtreuting]

Look at http://stackoverflow.com/questions/15273074/sharprepository-ef5-how-to-share-dbcontext for more info on the request.

Need to figure out the best way to allow passing in the DbContext. For RepositoryFactory we could allow some meta-data to be passed in that is used by the approprate specific factory if it matches what it is looking for. Or we could create a way in the config file to tell us what Ioc container to use to create the DbContext object. Then it could be handled there.

[jtreuting]

Done.

Now you can set a DependencyResolver that SharpRepository will use when it needs to create an object (specifically, DbContext for Ef5Repository). If one is not provided then a new DbContext will be created.

This allows the user to control the lifecycle of the DbContext and thus share one across repositories within the same lifecycle.

Usage is:

RepositoryDependencyResolver.SetDependencyResolver(new StructureMapDependencyResolver(ObjectFactory.Container));

Resolvers for Autofac, Ninject, StructureMap, Unity and Windsor are provided and any others can easily be created by inheriting from BaseRepositoryDependencyResolver.