Question

Iam using structure map for resolving my dependencies, however i have a rather special case where i want a dependency to be constructed through a method call.
This method shoudl be called everytime i cann GetInstance() however it only executes once.

My declaration looks like this:

x.For<UserService>().Use(c => { return MultiObjectProvider.GetInstance<UserService>(); });

is also tried

x.For<UserService>().LifecycleIs(new ThreadLocalStorageLifecycle()).Use(c => { return MultiObjectProvider.GetInstance<UserService>(); });

which didnt change anything.
Does anyone know how i can make structuremap resolve every time ?

Answer 1

That should work. I think the problem may be in your MultiObjectProvider.GetInstance method (which perhaps returns the same instance in successive calls) rather than here.

Here’s a quick Unit Test I put together to mimic what you have (I just used System.Guid instead of your UserService), and which passes.

    [TestInitialize]
    public void Initialize()
    {
        ObjectFactory.Initialize(x =>
        {
            x.For<Guid>().Use(c => { return Guid.NewGuid(); });
        });
    }

    [TestMethod]
    public void Test()
    {
        var o1 = ObjectFactory.GetInstance<Guid>();
        var o2 = ObjectFactory.GetInstance<Guid>();
        Assert.AreNotSame(o1, o2);
    }

Side note: You can simplify your syntax as follows:

x.For<UserService>().Use(() => MultiObjectProvider.GetInstance<UserService>());

And even

x.For<UserService>().Use(MultiObjectProvider.GetInstance<UserService>());