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

Visual Basic .NET OOP Indexers, Equals, constants, enums and flags in VB.NET

In the previous lesson, Abstract class, comparing and operator overloading in VB.NET, 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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