IEnumerable 🆚 IEnumerator Interfaces in C#

Today's Advanced C# Topic is: IEnumerable and IEnumerator Interfaces

In this video you will learn what IEnumerable and IEnumerator are
What are advantages of IEnumerable and IEnumerator
When to use them
How to use them
What are advantages of using IEnumerable and IEnumerato
How IEnumerator and IEnumerable are related to lists, arrays, and other types of colletions.

The IEnumerable interface is the base Interface for many collections in C#, and its job is to provide a way of iteration through a collection. That is why we can use foreach loops to go through a List or a Dictionary. In simple English when a collection class implements the IEnumerable interface it becomes countable, and we can count each element in it individually

There are 2 versions of the IEnumerable Interface

1.IEnumerable for generic collections
2.IEnumerable for non generic collections

But since generic collections were introduced later after the non-generic ones and it is no longer recommended to use the non-generic collections in a new project due to their need to perform boxing and unboxing (converting the types of objects), we will explain how to use the IEnumerable T interface in this lesson

when it is recommended to use the IEnumerable interface:

- Your collection represents a massive database table, you don’t want to copy the entire thing into memory and cause performance issues in your application.

When it is not recommended to use the IEnumerable interface:

- You need the results right away and are possibly mutating / editing the objects later on. In this case, it is better to use an Array or a List

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[tutorialsEU]

Here is an article about IEnumerable and IEnumerator Interfaces with a complete code, enjoy!

[gazells]

Super clear explanation - exactly what I needed!

[lowkeyhuman]

This is some top tier explanation, I have no choice but to subscribe :)

[dayday]

Best explanation on YouTube. Thank you!

[angel_machariel]

Good video. Question: how relevant is it to learn how to implement IEnumerator<T> ? Should it be an urgent matter for post-beginner students/juniors or shouldn't one be bothered with it for now?

[simonroyjonesuk]

Wow that was brilliant. I finally understand what IEnumerable does. I didn't know what a queue was, so I watched your video on that, which was also great. So well explained and really helpful. You are definitely my new go to source for C#. Thanks again. Simon

[bryanburger]

Great job at conveying the principles!

[FumeCreates]

Thank you so much for this video. Well explained and I received so much value

[juniorlucival]

top top top, thanks, you are the best c# teacher .

[oaksoeaung]

Thanks, a lot. This video helps me a lot.

[carlossantamaria]

amazing video, now i understood what this mean, this video also helped me to see the importance of interfaces in general, not only IEnumerable interface.

[BackeB]

The first ”ahaa” moment I’ve had regarding interfaces, when you described the issues presented without interfaces. So they provide similar functionality among othervise unrelated classes. For example 😁

[andrewfedorov]

Well. I got the examples but I didn't get the main idea why do we need this "IEnumerable" thing? To treat List<int> and int array with the same function? At the end they both are <int> so we can collect List<int> values to array first and just make a function to work only with arrays. Or array to list. Because they both are <int>. So why do we need all of this?

[andreashecht]

so just a logical question:
Why don't we just make dogs a public list and itterate in the foreach loop through shelter.dogs?

[nikolazagorac]

Great video, why can't I save it?

[oblivion]

Thank you ... you didn't cover anything necessary about it ... Very elementary ... but It helpful yet

[hgswtju]

So we use IEnumerable, when we want introduce class like array or list. Yes?

[danielbereketsiyum]

Can we consider this as runtime polymorphism, because the IEnumerable interface is holding different array types at runtime?

Thank you.

[TheKrckeR]

Instead of going, foreach loop shelter, couldnt we just loop though => shelter.dogs in the foreach looop since its public list?

[youtischia]

Good video but can you explain why it is necessary to have 2 interfaces Ienumerable and Ienumerator ? What is the need for Ienumerable when it is Ienumerator that does all the work ?