Microsoft Office Tutorials and References
In Depth Information
Lesson 21: Class Modules
21
Class Modules
Class modules — the very name has caused many an Excel VBA programmer to turn away
from the topic as if it doesn’t or shouldn’t exist. For some reason, the use of class modules is
not a skill held by many otherwise knowledgeable VBA programmers, despite the power and
flexibility class modules can provide to your workbook projects.
Class modules are not rocket science, but they are a different kind of VBA animal that takes
some extra attention to grasp. I want to express three objectives in this lesson:
Explain what classes and class modules are.
Describe what class modules can do for you.
Provide examples of class modules applied to UserForm and embedded
worksheet controls.
Here is an opportunity for you to set yourself apart from the VBA crowd and learn a valuable
skill that has actually been available in Excel since Office 97. Though you won’t need class
modules for most of your projects, you’ll learn how to recognize when the time is right to use
class modules, and most importantly, how to program them.
WHAT is A clAss?
A class is the formalized definition of an object that you create. Your first reaction might be
to wonder why you’d ever need to create yet another object in Excel, which seemingly has no
shortage of objects. Actually, you normally don’t need to, but there will be times when your
workbook will be better off if you do.
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