In asp.net MVC2 using unity does my program need to manage the lifetime of the container?

I'm putting the unity container creation/setup in the global.asax. and making the container a static property on that class since i'm not sure how unity works or if the container needs to be kept alive and references elsewhere. What's the recommended location of unity开发者_如何学C initialization/configuration for mvc 2?

You shouldn't need to keep an explicit reference around for the container. A container should wire up the requested object graph (Controllers in this case) and get out of the way.

Take a look at the container-specific implementations of IControllerFactory in MVCContrib.

That said, I like the WindsorControllerFactory a lot better than the UnityControllerFactory, but you could implement a UnityControllerFactory that uses the same pattern (Constructor Injection) as the WindsorControllerFactory.

If you imagine that we do that, your Global.asax should look like this:

var container = new UnityContainer();

// configure container

var controllerFactory = new UnityControllerFactory(container);
ControllerBuilder.Current.SetControllerFactory(controllerFactory);

controllerFactory holds a reference to the container, so you can let it go out of scope in Application_Start - it's going to stay around because the ControllerFactory stays around.

Here's how we did it:

public class UnityControllerFactory : DefaultControllerFactory
{
    private IUnityContainer container;

    public UnityControllerFactory(IUnityContainer container)
    {
        this.container = container;
    }

    public static void Configure()
    {
        IUnityContainer container = new UnityContainer();
        //...Register your types here

        ControllerBuilder.Current.SetControllerFactory(new UnityControllerFactory(container));
    }

    protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
    {
        if (controllerType == null)
        {
            return base.GetControllerInstance(requestContext, controllerType);
        }

        if (!typeof(IController).IsAssignableFrom(controllerType))
        {
            throw new ArgumentException("Type requested is not a controller", "controllerType");
        }

        return container.Resolve(controllerType) as IController;
    }
}

And then in global.asax.cs

public class MvcApplication : System.Web.HttpApplication
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        .... whatever you like
    }

    protected void Application_Start()
    {
        RegisterRoutes(RouteTable.Routes);
        UnityControllerFactory.Configure();
    }
}