储存库，IRepository和结构图

Question

I have an interface IRepository and an implementation EFRepository.
I use structuremap injection in order to get the repository implementation.
Right now the EFRepository has constructor with no parameter so structuremap knows to retrieve instances on EFRepository easily.

Now I need to change the repository implementation so that it will recieve in the constructor parameter that holds the unit of work.

My question in such case, how I use structuremap in order to return an instance that initialized with the unit of work?

EXAMPLE
Until today I used:

using(IUnitOfWork uow=UnitOfWork.current) {
    IRepository rep = ObjectFactory.GetInstance<IRepository<T>>();
    //repository operations that uses UnitOfWork.current that initialized above
}// here dispose of UnitOfWork.current

Now I want to use:

using(IUnitOfWork uow=new UnitOfWork()) {
    //Not sure is this is how I tell sructure map to use contractor that 
    //get IUnitOfWork)    
    IRepository rep = ObjectFactory.GetInstance<IRepository<T>>(uow);
    //repository operations that uses uow that initialized above
}// here dispose of UnitOfWork

Answer 1

I'm assuming here that your unit of work is request-specific... So you have a service (WCF?) and each incoming request gets its own unit of work.

Then you can configure StructureMap to define a separate unit of work per HTTP Request. If you need unit testing without HTTP Requests, you can choose for a hybrid lifecycle: per HTTP Request OR per thread. StructureMap will figure out what to do at runtime.

ObjectFactory.Configure(x => x.For<IUnitOfWork>()
              .HybridHttpOrThreadLocalScoped()
              .Use<MyUnitOfWork>());

Your class that needs the constructor injection simply states that it needs an IUnitOfWork:

public MyClass(IUnitOfWork unit) { ... }

This of course requires that MyClass is also managed/instantiated using StructureMap.

Answer 2

In order to pass a specific instance to ObjectFactory you can use "with":

IRepository rep = ObjectFactory.With<UnitOfWork>(uow).
  GetInstance<IRepository<T>>();