Change Classes while runtime?

Question

See: http://web48.isp4net.de/other/class.jpg I have an Class A which is in the core so I cant change it. Its function is called by an function which is in the core too. Now i inheritanced everything from Class A to a new Class B and created an override of the function called by the core. Now i want to change my A to the class B so that the new function is called and not the function of Class A. How to do this without changing the Core? Class A is a public class which inheritated from another class. The function of Class A is inheritated (public override void). The Original function is a public virtual void. Class B inheritated everything from Class A. Class B overrides the function of Class A => public override void. Now i just have to change the type of..lets say Test from A to B...but how? I have to change it while running and i can't edit the core which originally calls the function of A....

Antti · Answer

You can cast to derived class after superclass object is created. Here's couple examples: ClassA superClassObject = new ClassA(); superClassObject.Test(); //create new ClassB object by casting ClassB derivedObject = (ClassB)superClassObject; derivedObject.Test(); //temporaly cast to ClassB ((ClassB)superClassObject).Test(); //re-intanciate superClassObject as ClassB object (of course deletes the superClassObject's data) superClassObject = new ClassB(); Other way you might want to try is delegates . Create delegate type with appropriate parameters and return value intanciate it and set different methods to it.