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   ► KBTo/From GuidesASP Classic  Print This     

Overriding (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.


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General Info: Method Overriding

Where you define or implement a virtual method in a parent class and then replace it in a descendant class.

When you decide to declare a method as virtual, you are giving permission to derived classes to extend and override the method with their own implementation. You can have the extended method call the parent method's code too.

In most OO languages you can also choose to hide a parent method. When you introduce a new implementation of the same named method with the same signature without overriding, you are hiding the parent method.

ASP Classic:   Not Supported

Since ASP Classic does not support inheritance, there is no concept of a descendant class nor overriding.

VB.Net:   Overridable, Overrides

In VB.Net, you specify a virtual method with the Overridable keyword in a parent class and extend (or replace) it in a descendant class using the Overrides keyword.

Use the base keyword in the descendant method to execute the code in the parent method, i.e. base.SomeMethod().

Syntax Example:
Public Class Robot
Public Overridable Sub Speak()
MessageBox.Show("Robot says hi")
End Sub
End Class
Public Class Cyborg
Inherits Robot
  Public Overrides Sub Speak()
End Sub
End Class

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