Wrox Programmer Forums

Need to download code?

View our list of code downloads.

| FAQ | Members List | Calendar | Search | Today's Posts | Mark Forums Read
ASP.NET 2.0 Basics If you are new to ASP or ASP.NET programming with version 2.0, this is the forum to begin asking questions. Please also see the Visual Web Developer 2005 forum.
Welcome to the p2p.wrox.com Forums.

You are currently viewing the ASP.NET 2.0 Basics section of the Wrox Programmer to Programmer discussions. This is a community of tens of thousands of software programmers and website developers including Wrox book authors and readers. As a guest, you can read any forum posting. By joining today you can post your own programming questions, respond to other developers’ questions, and eliminate the ads that are displayed to guests. Registration is fast, simple and absolutely free .
DRM-free e-books 300x50
Reply
 
Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old March 13th, 2008, 08:27 AM
Registered User
 
Join Date: Mar 2008
Location: , , .
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default question

Definition for "VIRTUAL METHOD"?

waiting for replay...

Reply With Quote
  #2 (permalink)  
Old March 13th, 2008, 08:32 AM
Wrox Author
Points: 13,255, Level: 49
Points: 13,255, Level: 49 Points: 13,255, Level: 49 Points: 13,255, Level: 49
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Oct 2005
Location: Ohio, USA
Posts: 4,104
Thanks: 1
Thanked 64 Times in 64 Posts
Send a message via AIM to dparsons
Default

www.google.com


================================================== =========
Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
================================================== =========
.: Wrox Technical Editor / Author :.
Wrox Books 24 x 7
================================================== =========
Reply With Quote
  #3 (permalink)  
Old March 13th, 2008, 08:45 AM
planoie's Avatar
Friend of Wrox
Points: 16,481, Level: 55
Points: 16,481, Level: 55 Points: 16,481, Level: 55 Points: 16,481, Level: 55
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Aug 2003
Location: Clifton Park, New York, USA.
Posts: 5,407
Thanks: 0
Thanked 16 Times in 16 Posts
Default

As I understand it, in C# a method can be modified with "abstract" or "virtual" (among other things). "abstract" seems to mean that a deriving class MUST implement/override the method whereas "virtual" means that the derived class CAN override it but doesn't have to.

-Peter
peterlanoie.blog
Reply With Quote
  #4 (permalink)  
Old March 13th, 2008, 08:54 AM
planoie's Avatar
Friend of Wrox
Points: 16,481, Level: 55
Points: 16,481, Level: 55 Points: 16,481, Level: 55 Points: 16,481, Level: 55
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Aug 2003
Location: Clifton Park, New York, USA.
Posts: 5,407
Thanks: 0
Thanked 16 Times in 16 Posts
Default

Also, a class in which you define an abstract member must itself be abstract because abstract members must be implemented.
Code:
    abstract class AbstractClass
    {
        protected void NotModifiedMethod() { }

        protected abstract void AbstractMethod();

        protected virtual void VirtualMethod() { }
    }

    class ConcreteClass : AbstractClass
    {
        //This HAS to be overriden because it's abstract
        protected override void AbstractMethod() { }

        //This CAN be overriden because it's virtual
        protected override void VirtualMethod()
        {
            base.VirtualMethod();
        }

        //You CAN NOT do this, because NotModifiedMethod is not
        //marked as abstract or virtual
        protected override void NotModifiedMethod() { }
    }
-Peter
peterlanoie.blog
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question Ashwini Classic ASP Databases 3 January 10th, 2006 07:20 AM
Question Ashwini Classic ASP Databases 1 January 4th, 2006 06:55 AM
Question? Calibus Classic ASP Databases 8 August 6th, 2004 08:25 AM
a question gorji C++ Programming 2 August 11th, 2003 07:41 AM



All times are GMT -4. The time now is 12:37 AM.


Powered by vBulletin®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
© 2013 John Wiley & Sons, Inc.