ASP.NET MVC 3 + Unity injection of the Controller

Question

Which event is the best for registering the types with Unity?

I wish to do this

        iocContainer.RegisterType<ControllerA>();
        iocContainer.RegisterType<ControllerB>();

so they could be retrieved by the ControllerFactory from the Unity Container.

My opinion was to do that in the Application_Start event, but I've been warned that I could face many problems caused by the App pool recycling (not firing the Application_start). So the alternative would be the Session_start.

Any advice?

[UPDATE]

But if I use

iocContainer.RegisterInstance<IService>(service)

what happens if the app pool recycle or IIS is resetted? Is the instance of service been recreated?

Mark Seemann · Accepted Answer · 2011-05-29 07:27:29Z

2

No, Application_start is the correct place to do it.

Nothing's going to help if the app pool or IIS (or the server is recycled). Then the container will be recycled itself, but when the app pool is restarted, the container will be configured anew.

edited May 29, 2011 at 7:27

answered May 26, 2011 at 12:20

Mark Seemann

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2 Comments

Steven Over a year ago

I agree. Certainly not session start, because that would either mean you reconfigure the whole system every time a new session is started, or would result in a container-per-session, which would lead to all sorts of hard to track problems.

ab_732 Over a year ago

Ok, I believe this is the best way for accomplish that. Thank you!

Mehmetali Shaqiri · Accepted Answer · 2011-05-26 14:38:58Z

2

I think that PreApplicationStartMethod is a better place.

Check out these articles:

http://haacked.com/archive/2010/05/16/three-hidden-extensibility-gems-in-asp-net-4.aspx

http://ilearnable.net/2010/11/22/webactivator-preapplicationstartmethod/

answered May 26, 2011 at 14:38

Mehmetali Shaqiri

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1 Comment

Steven Over a year ago

Interesting. I wonder what happens when a pre application start method fails. The problem with a failing Application_Start method is that the app domain stays alive, but leaves the system in an invalid (probably unconfigured) state.

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