How to change the class of an object dynamically in C#?

Question

Suppose I have a base class named Visitor, and it has 2 subclass Subscriber and NonSubscriber.

At first a visitor is start off from a NonSubscriber, i.e.

NonSubscriber mary = new NonSubscriber();

Then later on this "mary" subscribed to some services, and I want to change the type of "mary" to Subscriber.

What is the conventional way to do that?

Answer 1

can't do that. sorry. C# is not a dynamic language.

Answer 2

You will have to create a new mary = new Subscriber(); and copy all relevant properties.

But a better approach might be to model it differently: Give Visitor a list of subscriptions. An empty list means a NonSubscriber.