April 2003
Intermediate to advanced
560 pages
14h 4m
English
Content preview from Programming Visual Basic .NET, Second EditionBecome 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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VB.NET Types
Visual Basic .NET can (and should) be treated as a strongly typed language. In a strongly typed language you must declare the type of each object you create (e.g., Integer, Decimal, String, Window, Button, etc.) and the compiler will help you prevent bugs by enforcing that only data of the right type is assigned to those objects. You tell the compiler you want Visual Basic .NET to be strongly typed by adding the line:
Option Strict On
to the top of every source code file. While this is optional it is
good programming practice, and this book will assume that Option
Strict is set On from now on. You can make this the default in Visual
Studio .NET (starting in Version 1.1.) by choosing the menu items
Tools->Options->Projects->VB Defaults and
setting the default to Option Strict On.
The type of an object signals to the compiler the size of that object (e.g., Integer indicates an object of 4 bytes) and its capabilities (e.g., Buttons can be drawn, pressed, and so forth).
Like C++ and Java, Visual Basic .NET divides types into two sets: intrinsic (built-in) types that the language offers and user-defined types that the programmer defines.
Visual Basic .NET also divides the set of types into two other categories: value types and reference types.[3] The principal difference between value and reference types is the manner in which their values are stored in memory. A value type holds its actual value in memory allocated on the stack (or it is allocated as part of a larger ...
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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.
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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.