Question

VB.net shadows And overideable keywords

Asked by: Zeus2009

Hi all,

Visual studio 2008 Pro, .Net 2

Can someone please provide a good definition of why and when to use the Shadows & Overide in vb.net please.

I have many books but they are sooooo elongated its rediculous.

Thanks
zeus

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Asked On
2009-09-08 at 11:58:01ID24715868
Tags

vb.net

,

vb.net controls

Topics

.NET Framework 2.x

,

Microsoft Visual Basic.Net

Participating Experts
2
Points
250
Comments
3

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Answers

 

by: AfricansPosted on 2009-09-08 at 12:21:58ID: 25285226

Hi,
Check this link for more details about Shadows
http://msdn.microsoft.com/en-us/library/1h3wytf6%28VS.100%29.aspx

Check this link for more details about Overrides:
http://msdn.microsoft.com/en-us/library/k777kzw1%28VS.80%29.aspx

How to use Overloading in VB.NET:
http://www.mail-archive.com/bdotnet@groups.msn.com/msg00728.html

Good Luck

 

by: Zeus2009Posted on 2009-09-08 at 13:12:33ID: 31626254

Fantastic answers straight to the point and accurate thank you.

Zeus

 

by: ladarlingPosted on 2009-09-08 at 13:29:25ID: 25285848

Overrides allows you to redefine a class member in your derived type. You use the overrides keyword when there is a default implementation of some aspect of a base class, but instead of using that you wish to substitute your own code. For example, overriding a forms OnPaint event is a fairly common scenario, allowing you to substitute your own graphics manipulation code.

The functionality of Shadows can be thought of similarly to Overrides, except that Shadows does not extend or provide a new definition to the base classes member, like overrides does, but hides the base class member completely and redefines it as if there were no parent implementation (unless you treat the object as the base-class, which makes the water muddy and I wont go into that).

Overrides is a normal object orient programming paradigm that allows a programmer to 'redefine' or extend a member of a base class.

Shadows, on the other hand, is rarely used and is not a normal object oriented paradigm, since the base class cannot control its morphic shape anymore (since you can shadows portions of the base class to provide no functionality whatsoever). It is useful in situations where you need to do just that, or a member of the base class was declared NotOverrideable, you dont have access to the base class's source code, and it now must be overridden. You cant think of it as the the 'last resort' override, effectively.

This is a decent comparison of the two:

http://stackoverflow.com/questions/463209/shadows-vs-overrides-in-vb-net

20120131-EE-VQP-002

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