Shit.cs

class ItemFactory
{
	public static Dictionary<Type, Func<AbstractItem>> Thing = new Dictionary<Type, Func<AbstractItem>>();
}

abstract class AbstractItem {
	// Item common methods go here
}

class Item<T> : AbstractItem where T : Item<T> {
	

	static Item() {
		ItemFactory.Thing[typeof(T)] = () => (AbstractItem) Activator.CreateInstance(typeof(T));
	}

}

class Boots : Item<Boots> {
	
}