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Prevent Derivation◄╣

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► KB ► To/From Guides ► ASP Classic

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Prevent Derivation (ASP Classic and VB.Net Cross Reference Guide)

By Mike Prestwood

ASP Classic versus VB.Net: A side by side comparison between ASP Classic and VB.Net.

OOP Details

More object oriented (OO) stuff.

Prevent Derivation

[Other Languages]

Languages Focus

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

ASP Classic: Not Supported

VB.Net: NotInheritable, NotOverridable

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