Unity and MVC–Resolving types challenge

Imagine you have a situation like this:

2 MVC controllers (A and B) have a dependency on SvcA**. SvcA has a dependency on SvcB and a component implementing IX.SvcB has a dependency on something implementing IY.

Every time the system resolves CtrlA we want to provide Y1 and every time it resolves CtrlB, we want to provide Y2.

Something like this:

and

 

How would you configure Unity to solve this?

No “if() else” allowed. System supplies its own MVC’s ControllerFactory. (via ControllerBuilder.Current.SetControllerFactory) . Ideally, we want the ControllerFactory to have no knowledge of any of these specific components.

Some help: read Chris’s blog and Unity docs.

Comments

• Anonymous
  January 26, 2011
  IF (ControllerFactory to have no knowledge) THEN  Write custom extension that will have this "logic" (those IFs for different CTRLs) and will return desired type/instance in special cases, otherwise will allow normal resolution of dependencies. ELSE  use child contaner per each such drawn group class Somewhere you you will have to place those if (or translate ifs into some kind of hierarchy (interface/object), but in this case if will exist inside of unity during resolution)

• Anonymous
  January 26, 2011
  I thought about subcontainers too, but the code seemed to complicated. It could work though, there's no single (correct) answer. Thanks for posting yours!

• Anonymous
  January 28, 2011
  The comment has been removed

• Anonymous
  January 28, 2011
  Thanks Nick! I've never tried Autofac, but heard great things about it.