Prestwood IT: VB.Net Prevent Derivation (NotInheritable, NotOverridable) (VB.Net Language)

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► KB ► Programming ► VB.Net ► OOP

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From the April 2009 Issue of Prestwood eMag

VB.Net OOP:

VB.Net Prevent Derivation (NotInheritable, NotOverridable)

By Mike Prestwood

Posted 16 years ago on 10/24/2008 and updated 1/19/2009

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Tags: VB.Net , Prevent Derivation

KB101429

Languages Focus: Prevent Derivation

How do you prevent another class from inheriting and/or prevent a class from overriding a member.

VB.Net Prevent Derivation

With VB.Net, use the NotInheritable keyword to prevent a class from being inherited from and use the NotOverridable keyword to prevent a method from being overridden.

A method marked NotOverridable must override an ancestor method. If you mark a class NotInheritable, all members are implicitly not overridable so the NotOverridable keyword is not legal.

Syntax Example:

Public Class Machine

  Public Overridable Sub Speak(ByRef pSentence As String)
    MessageBox.Show(pSentence)
  End Sub
End Class

Public Class Robot
  Inherits Machine

  Public NotOverridable Overrides Sub Speak(ByRef pSentence As String)
    MessageBox.Show(pSentence)
  End Sub
End Class

Public NotInheritable Class Cyborg
  Inherits Robot
End Class

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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