November 2001
Intermediate to advanced
512 pages
9h 10m
English
Content preview from Visual Basic Design Patterns: VB 6.0 and VB.NETBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 23. The Command Pattern
The Chain of Responsibility forwards requests along a chain of classes, but the Command pattern forwards a request only to a specific object. It encloses a request for a specific action inside an object and gives it a known public interface. It lets you give the client the ability to make requests without knowing anything about the actual action that will be performed and allows you to change that action without affecting the client program in any way.
Motivation
When you build a VB user interface, you provide menu items, buttons, check boxes, and so forth to allow the user to tell the program what to do. When a user selects one of these controls, the program receives a clicked event, which it receives into a special ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.