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Archive for May, 2020

IEnumerator and IEnumerable

Friday, May 8th, 2020

Before we can start delving into LINQ, we need to first understand the underlying principles upon which it is built. LINQ is all about operations over collections, so, you’ve guessed it: we will be dealing with collections.

You already learned that of all data structures, arrays are the fastest, because they are unsorted non-generic data structures.… Read more

The meaning of “this” on extension methods

Monday, May 4th, 2020

In the lesson about extension methods, we learned that they are a nice way of adding extra functionality to existing types, and we did that by adding a static method inside a static class, that took a type parameter prefixed with the this keyword, like this:


So, although my original Book class does not contain a method called SellBook(), I am able to call it inside the Main() method because I declared an extension method for the Book class, and this static SellBook() method took a Book type parameter prefixed with the this keyword, that signals the compiler that the method is intended as an extension method for the Book type.… Read more

Extension methods

Monday, May 4th, 2020

Sometimes, programmers find themselves in need of adding new functionality to already existing codes, in order to improve or complete them. If the said source code is available, the task is simple – they only need to add the required functionality and recompile.… Read more


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