Declaring Virtual Members
To illustrate the concept of virtual members from a different angle, let’s define another type hierarchy in which we declare virtual members ourselves (rather than overriding the ones from System.Object
). A good example is the concept of a Shape
that can be queried for its area and circumference. Depending on the subclass of Shape
, calculation of those values will differ:
class Shape{ public virtual double Area { get { return 0.0; } } public virtual double Circumference { get { return 0.0; } }}
For the time being, we use default implementations for those virtual property getters, which don’t look as if they produce very meaningful values. Later on, after you’ve ...
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