How do I override the setter method of a property in C#?

Question

I have a class with a subclass. The superclass has a Position property. The subclass must perform an additional operation when the Position property is changed, so I am attempting to override the setter method and call the superclass' setter.

I think I've got the superclass setter calling part down, but I can't figure out how the overriding syntax works here.

Here is my best attempt:

The getter is there just for proof of concept -- suppose I wanted to override that too?

The getter and setter give me errors of this form:

cannot override inherited member 'superClassName.Position.[gs]et' because it is not marked virtual, abstract, or override

Here's a screencap of the errors too for good measure:

I also tried using the override keyword in front of the set. Removing the superfluous getter has no effect.

What is the correct syntax?

Answer 1

The override is fine. However, as the error message states, you need to mark the property in the base class as virtual to be able to override it:

public virtual Vector2 Position 

Unlike Java, class members are not virtual by default in C#. If you can't change the base class, you're out of luck.