IEnumerable 🆚 IEnumerator Interfaces in C#
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- čas přidán 19. 04. 2021
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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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Here is an article about IEnumerable and IEnumerator Interfaces with a complete code, enjoy!
tutorials.eu/ienumerable-and-ienumerator/
Super clear explanation - exactly what I needed!
This is some top tier explanation, I have no choice but to subscribe :)
Thanks, a lot. This video helps me a lot.
Best explanation on CZcams. Thank you!
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
Thank you so much for this video. Well explained and I received so much value
Great job at conveying the principles!
Great demo! Thank you!
Thanks for clearing it up!
Good video. Question: how relevant is it to learn how to implement IEnumerator ? Should it be an urgent matter for post-beginner students/juniors or shouldn't one be bothered with it for now?
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.
Good practical and usable explanation
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 😁
Thank you so much for this video
top top top, thanks, you are the best c# teacher .
Clean and Simple
Good video thanks
Very interesting, thanks!
Glad you liked it!
Well. I got the examples but I didn't get the main idea why do we need this "IEnumerable" thing? To treat List and int array with the same function? At the end they both are so we can collect List values to array first and just make a function to work only with arrays. Or array to list. Because they both are . So why do we need all of this?
nice video
Thank you ... you didn't cover anything necessary about it ... Very elementary ... but It helpful yet
Great video, why can't I save it?
So we use IEnumerable, when we want introduce class like array or list. Yes?
Instead of going, foreach loop shelter, couldnt we just loop though => shelter.dogs in the foreach looop since its public list?
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 ?
from what I've heard, it's because when C# came out it didn't have generics yet and they built it on that.
Can we consider this as runtime polymorphism, because the IEnumerable interface is holding different array types at runtime?
Thank you.
Kind of...
so just a logical question:
Why don't we just make dogs a public list and itterate in the foreach loop through shelter.dogs?
i have the same question in my head
7:38
was following until you called dogs.GetEnumerator(). This function was never defined. What does GetEnumerator() actually do? Where's the implementation?
Why couldn't you just use shelter.dogs in your foreach loop?
Kartoffelsalat
too basic
I am just at the beginning of the video. But please remove that weird animations if your target audience is not under 5 years old kids. They are so distracting.
loosen up 😀
Books exists though, you can use them and surely don't gonna find any animation within...
The cartons and images seriously detract from the usefulness of the video, also by having the IDE do the work, you are actually are creating programmers who don't know truly what they are doing, thumbs down and I would recommend anyone from staying away from your courses