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Lesson 17 - Indexers, Equals, constants, enums and flags in VB.NET

In the previous exercise, Solved tasks for OOP in VB .NET lessons 14-16, we've practiced our knowledge from previous lessons.

In the previous lesson, Solved tasks for OOP in VB .NET lessons 14-16, we went over abstract classes and learned how to overload operators in Visual Basic .NET. The last 3 lessons were very practical, as in lots of doing and getting right into sample programs. This time around we're going to get back into theoretical concepts for a little bit.

Indexers

Similarly, as we could overload an operator, in our own class, we can overload the indexer as well. We know indexers very well from collections, we use them as parentheses () and they allow us to work with classes as if they were collections. We can index both by numbers or strings. Let's make a quick little class:

Public Class CustomCollection
        Private internalCollection As List(Of Integer) = New List(Of Integer)(New Integer() {1, 2, 3, 4, 5})

End Class

The class contains an internal collection of 5 numbers, where we will now implement a custom indexer. In .NET, we implement indexers as properties. They are declared like this:


 

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Article description

Requested article covers this content:

This Visual Basic tutorial is about indexer overloading, the Equals() method as well as the = operator, constants, enumerated types (enums) and flags.

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Article has been written for you by Michal Zurek
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