#358 – Virtual Properties Support Polymorphism

In C#, polymorphism is implemented using virtual members–which can be methods, properties, indexers or events.

A virtual property has an implementation in the base class that can be overridden in a derived class.  When the property is read or written, the get or set accessor that is used is determined at run-time based on the type of the underlying object.

A virtual property is defined in the base class using the virtual keyword.

        protected string temperament;
        public virtual string Temperament
        {
            get
            {
                return string.Format("{0} is {1}", Name, temperament);
            }
        }

A virtual property is overridden in a derived class using the override keyword.

        public override string Temperament
        {
            get
            {
                return string.Format("Terrier {0} is {1}", Name, temperament);
            }
        }

Using the property:

            Dog kirby = new Dog("Kirby", 15);
            Console.WriteLine(kirby.Temperament);  // Kirby is Average

            Dog jack = new Terrier("Jack", 15);
            Console.WriteLine(jack.Temperament);   // Terrier Jack is Surly
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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.

2 Responses to #358 – Virtual Properties Support Polymorphism

  1. Pingback: #684 – Hidden Base Class Members Aren’t Really Hidden « 2,000 Things You Should Know About C#

  2. stravinsky7 says:

    Ah, I see.. question from 2 posts ago answered, slantwise.

    Just keep reading.. Just keep reading.. What do we do? we Read!!

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