I’ve previously discussed the usefulness of StructureMap’s named instances, as well as bemoaning how fugly the syntax is for using them:
For<IUserRepository>() .Ctor<ISession>("session").Use(c => c.GetInstance<ISession>("UserDB"));
I submitted a pull request to improve it, but the other day I realised I could fix it in the current version with an extension method:
public static class StructureMapExtensions { public static SmartInstance<T> Named<T, CTORTYPE>(this SmartInstance<T>.DependencyExpression<CTORTYPE> instance, string name) { return instance.Is(c => c.GetInstance<CTORTYPE>(name)); } }
Which means you can say:
For<IUserRepository>() .Ctor<ISession>("session").Named("UserDB");
Yay!
Better still, the pull request was merged. https://github.com/structuremap/structuremap/commit/1e0ffe31558bde1777ea49344d40d4ed091b666b