Represents a container of IAddon objects.
public abstract class AddonBag
AddonBag is the base class of extensible rich metadata objects, such as Model and Column. IAddon object, on the other hand, is uniquely identified by Key, can be added into this metadata object and later retrieved either by key or by type. For example: DbIndex, which implements IAddon, can be added into Model identified by its Name.
Initializes a new instance of the AddonBag class.