#351 – An Abstract Method Has No Implementation

An abstract method is a special kind of virtual method, defined in a base class, which has no implementation of its own.  A derived class must define every abstract method and provide an implementation, using the override keyword.

    public abstract class Dog
        // Abstract method has no implementation
        public abstract void Bark();

    public class Terrier : Dog
        public override void Bark()
            Console.WriteLine("Terrier {0} is barking", Name);

The class in which the abstract method is defined must be defined as an abstract class, using the abstract keyword.

A derived class may not hide the abstract method in the base class, using the new keyword.  It must implement the inherited abstract method and the new method must be a virtual method, defined using the override keyword.


About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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