使用StructureMap注册具有通用类型的Contrete类

Question

I am new to StructureMap and have the following issue which seems to be the reverse of issues other people are having. I have a generic UnitOfWorkClass defined as follows:

public class UnitOfWork<TContext> : IUnitOfWork
    where TContext : IContext, new()
{
    ....
}

However I'm baffled about how you'd register this to resolve if I've got several different possibilities for the concrete instance.

I've seen plenty of examples where people have a generic interface such as:

StructureMap Auto registration for generic types using Scan

So I guess the question could be asked if I need to re-look at my design too!

Thanks a lot!

# EDIT POSSIBLE SOLUTION?

So I have a class which takes two parameters into the constructor:

ObjectFactory.Initialize(cfg =>
{
    var firstContext = cfg.For<IContext>().Use<MyFirstContext>();
    var secondContext = cfg.For<IContext>().Use<MySecondContext>();

    var firstUnitOfWork =
        cfg.For<IUnitOfWork>().Use<UnitOfWork<MyFirstContext>>()
        .Ctor<IContext>().Is(firstContext);

    var secondUnitOfWork =
        cfg.For<IUnitOfWork>().Use<UnitOfWork<MySecondContext>>()
        .Ctor<IContext>().Is(secondContext);

    cfg.For<IMyClass>().Use<MySecondContext>()
        .Ctor<IUnitOfWork>("firstConstructor").Is(firstUnitOfWork)
        .Ctor<IUnitOfWork>("secondConstructor").Is(secondUnitOfWork);
});

Then as my object graph gets built I do the following:

 ObjectFactory.Initialize(cfg => { var firstContext = cfg.For<IContext>().Use<MyFirstContext>(); var secondContext = cfg.For<IContext>().Use<MySecondContext>(); var firstUnitOfWork = cfg.For<IUnitOfWork>().Use<UnitOfWork<MyFirstContext>>() .Ctor<IContext>().Is(firstContext); var secondUnitOfWork = cfg.For<IUnitOfWork>().Use<UnitOfWork<MySecondContext>>() .Ctor<IContext>().Is(secondContext); cfg.For<IMyClass>().Use<MySecondContext>() .Ctor<IUnitOfWork>("firstConstructor").Is(firstUnitOfWork) .Ctor<IUnitOfWork>("secondConstructor").Is(secondUnitOfWork); }); 

So what I've done here is:

• Resolved my dependency for IContext and stored them in variables
• Injected the resolved IContext into my IUnitOfWork constructor
• I can then resolve the correct generic UnitOfWork constructor correctly

It doesn't feel perfect but I think this suits my needs...

Answer 1

I'm not entirely sure I understand what you want, but if you made the interface generic as in IUnitOfWork then you can register like this:

ObjectFactory.Initialize(x =>
{
    x.For(typeof(IUnitOfWork<>)).Use(typeof(UnitOfWork<>));
}

and StructureMap will supply the implementing class with the correct type. Does that give you waht you need?