#601 – A Class Can Both Inherit from A Parent Class and Implement an Interface

Every user-defined class inherits from exactly one other class.  You can either explicitly specify the class to inherit from, or the class can implicitly inherit from System.Object.

A user-defined class may optionally implement one or more interfaces.

A class may therefore both inherit from a parent class and also implement one or more interfaces.  All of the declarations listed below are valid class declarations.  (Class members are not shown).

// Implicitly inherits from System.Object
public class Movie
{
}

// Explicitly inherit from a class
public class Terrier : Dog
{
}

// Implement one or more interfaces
public class Dog : IBark, IFetch
{
}

// Inherit and implement an interface
public class BorderCollie : Dog, IHerd, IObsess
{
}
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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.

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