VISUAL BASIC 6 PROGRAMMING BLUE BOOK
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You can add items to a collection object either with or without specifying a key. If you add an item without a key, you must use its numeric index to access it.
The Visual Basic Collection class stores all its elements as type Object, so you can add an item of any data type. There is no safeguard against inappropriate data types being added.
When you use the Visual Basic Collection class, the first item in a collection has an index of 1. This differs from the. NET Framework collection classes, for which the starting index is 0.
Whenever possible, you should use the generic collections in the System. Generic namespace or the System. Concurrent namespace instead of the Visual Basic Collection class. For more information, see Collection. Each addition to the dictionary consists of a value and its associated key. Retrieving a value by using its key is fast because the Dictionary class is implemented as a hash table. The following example creates a Dictionary collection and iterates through the dictionary by using a For Each statement.
Key With theElement Console. The Item property enables you to access an item in the elements collection by using the elements symbol code in Visual Basic. LINQ queries provide filtering, ordering, and grouping capabilities. The LINQ query returns a different collection that contains the results.
Complete Idiot's Guide to Visual Basic 6.
Programming Microsoft Visual Basic 6. Beginning Visual Basic 6 Database Programming. Beginning Visual Basic 6 Objects. Microsoft Visual Basic: Game Programming for Teens. Microsoft Visual Basic game programming for teens.
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Visual Basic 6 Programming Explorer
Upgrading Microsoft Visual Basic 6. With Safari, you learn the way you learn best.
Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. No credit card required An Example Visual Basic.
Kernighan and Dennis M. Ritchie, The C Programming Language It has become a tradition for programming books to begin with a hello, world example. The idea is that entering and running a program—any program—may be the biggest hurdle faced by experienced programmers approaching a new platform or language.
Without overcoming this hurdle, nothing else can follow. This chapter contains three such examples: one that creates a console application, one that creates a GUI application, and one that creates a browser-based application. Each example stands alone and can be run as is.
NET has a command-line compiler! WriteLine "hello, world" End Sub End Module This version of hello, world is a console application -- it displays its output in a Windows command-prompt window.
NET command-line compiler, which ships with the. Compiling Hello. After compiling, type Hello at the command line to run your program. Figure shows the results of compiling and running this program.
The first line: Imports System indicates that the program may use one or more types defined in the System namespace. Types are grouped into namespaces to help avoid name collisions and to group related types together.
Visual Basic 6 Programming Blue Book: The Most Complete, Hands-On Resource…
Specifically, the hello, world program uses the Console class, which is defined in the System namespace. The Imports statement is merely a convenience. It is not needed if the developer is willing to qualify type names with their namespace names. WriteLine "hello, world" End Sub End Module However, it is customary to use the Imports statement to reduce keystrokes and visual clutter.
An important namespace for Visual Basic developers is Microsoft. For example, the Visual Basic Trim function is a member of the Microsoft. Strings class, while the MsgBox function is a member of the Microsoft. Interaction class. Much of the functionality available in this namespace, however, is also duplicated within the.
Developers who are not familiar with Visual Basic 6 will likely choose to ignore this namespace, favoring the functionality provided by the. NET Framework. NET Framework is introduced later in this chapter and is explained in detail in Chapter 3.
Next, consider this line: Public Module Hello This line begins the declaration of a standard module named Hello. The standard-module declaration ends with this line: End Module In Visual Basic 6, various program objects were defined by placing source code in files having various filename extensions.
Visual Basic 6 Programming Explorer by Peter G. Aitken (, Paperback)
For example, code that defined classes was placed in. In Visual Basic.
NET, all source files have. For example, classes are defined with the Class End Class construct, and standard modules are defined with the ModuleIn the old VB world, you could cherry pick the best third party tools from huge catalogs. Programming with Microsoft Visual Basic The LINQ query returns a different collection that contains the results.
Developers who are not familiar with Visual Basic 6 will likely choose to ignore this namespace, favoring the functionality provided by the. Space limitations prevent me from giving it a full treatment.
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