Dependency Injection in C# ❘ A Hands-On Guide to Boosting Code Flexibility and Testability

Рет қаралды 19,251

9 ай бұрын

Welcome back to Skill Foundry! Today, our expert Eric Wise will demystify Dependency Injection, a must-know for any coder aiming for better code flexibility and testability. We'll kick off with an overview before diving into hands-on coding, using C# to transform a basic Rock-Paper-Scissors game through Dependency Injection. This tutorial is useful for developers at all skill levels and will also cover common pitfalls and their solutions. After setting the stage with a theoretical framework, we'll transition into a hands-on coding session. Eric takes a straightforward but tightly coupled Rock-Paper-Scissors game coded in C# and demonstrates the transformative process of refactoring it into dependency-injected components using interfaces. This practical example will not only demystify the concept but also show you how to put it into practice in your own coding endeavors.
➡️ Whether you're just starting out or are an experienced developer in need of a refresher, this tutorial is crafted to be valuable for all skill levels. We'll also shed light on the common pitfalls developers encounter when neglecting to use Dependency Injection and provide actionable solutions for overcoming these challenges.
By the end of this video, you'll have a solid grasp of how designing classes for Dependency Injection allows for the swapping of behaviors and facilitates easier unit testing. These benefits, in turn, prepare you for more complex and advanced development projects, making this skill indispensable in your coding repertoire. Don't miss this chance to elevate your development skills. Be sure to subscribe to our channel and activate notifications so you're always in the loop. Thank you for tuning in, and we look forward to assisting you in your journey to becoming a more skillful developer.
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Пікірлер: 100

@SkillFoundryIO 26 күн бұрын

If you like this video and want to learn C# in depth from me, visit www.skillfoundry.io! The learning pathway takes you from zero to professional-level coding skills, but be prepared for rigor and depth. It takes over 700 hours to complete, with 80+ exercises and 12+ substantial capstone projects.

@guavavodka 9 ай бұрын

If anyone is curious why it's called dependency inversion, it is because instead of the class depending on lower level details (where the choices come from), it now depends on a HIGHER level abstraction (the interface), thus the dependencies were inverted

@SkillFoundryIO 9 ай бұрын

Absolutely! I left that term off the video because most novices only hear about the injection part. 😇 Thanks for adding more information!

@navjotkaur973 Күн бұрын

In depth Explanation from a master! Awesome!

@NebulaM57 4 күн бұрын

Sir, this was OUTSTANDING! Thank you so much! I really appreciated you talking slowly thru it. Really helped me not to too confused along the way. You make a great teacher!

@SkillFoundryIO 4 күн бұрын

Glad it helped!

@RogerDunder 2 ай бұрын

That was the easiest most clear explanation i found so far, thank you so much!

@SkillFoundryIO 2 ай бұрын

You are very welcome!

@julieyeaeun 6 ай бұрын

Eric you are an AMAZING teacher! Sincerely, a former teacher turned programmer :)

@SkillFoundryIO 6 ай бұрын

Thank you!

@extrasolar9976 10 күн бұрын

This is an awesome video! The way you explain this concept so clearly and calmly really made me understand it. Thanks!

@SkillFoundryIO 10 күн бұрын

You are welcome! Now reinforce it with practice!

@mitkram99 9 ай бұрын

This is exactly the approach we took in our project. OOP in C# is not complete if not done with DI. Dependency Injection was intimidating at first but once you fully understood its principles, you'll get addicted to using it in your OOP implementation.

@SkillFoundryIO 9 ай бұрын

Agreed! There is always a trade-off for complexity, so for really simple things like batch jobs I sometimes skip it, but for the most part you should be implementing it, especially between layers of your project.

@EA33964 2 ай бұрын

Best explanation so far. So glad I found your video. Thanks

@michi1106 24 күн бұрын

Love the short but rly clearly overview and example, of what dependency injection is. At the begin i thought it was some evil stuff, but learned fast, its simple and rly helpful.

@gracicot42 7 ай бұрын

Hi! I'm the creator of the kangaru dependency injection library for C++. What I love about that tutorial is that you teach beginners to do it without a framework. A dependency injection library is only there to automate boilerplate that happens in the wiring code, and not essential for dependency injection. Another point (for more advanced programmers) is that technically, dependency injection don't require interfaces to work. union (sum types) or enums can also do the trick when you want your component to let users choose its behaviour, but have a closed set of possible behaviour. This still enable testing without introducing virtual function calls when unneeded. In my case, which might be a C++ only thing, adding virtual functions (any overridable function) strictly only for the purpose of testing is smelly code. I try to keep behaviour choices as closed as possible and thus do my DI with concrete types when possible with the choice of behaviour being values inside those concrete types.

@SkillFoundryIO 7 ай бұрын

Thank you for your kind words! I agree on the virtual methods as well, it’s a smelly pattern.

@gracicot42 7 ай бұрын

@@SkillFoundryIO Yeah, but definitely something that will only appear with larger projects, or projects with tight performance requirements. Out of the scope of the video, but still worth mentioning here in the comments :)

@KnightMirkoYo 9 ай бұрын

Wow, really cool. I've been doing it a lot in my code, but didn't have a complete understanding of how powerful it is

@SkillFoundryIO 9 ай бұрын

I’ve noticed a lot of tutorials show how but don’t spend much if any time on the why. It’s one of the reasons in our courses we refactor projects as we learn new techniques so our learners can better see the difference between novice and professional approaches!

@panic_seller 9 ай бұрын

saw this in a Job Description and Now seeing it on KZfaq all in less than 2 hours, The gods wanted me to learn this

@SkillFoundryIO 9 ай бұрын

Hope it helped! If you want to go deeper into it in C#, check out our main site.

@stressfreesid9498 Ай бұрын

I will say you are the great master teacher. You have extra ordinary skills and techniques for teaching lots of blessing from all who watched this videos.

@SkillFoundryIO Ай бұрын

Thank you!

@TheSopk 23 күн бұрын

So clear, first time I understand how usefulin dependency injection.

@SkillFoundryIO 23 күн бұрын

Thank you!

@JanKowalski-ld4ec 4 ай бұрын

I'd been lookin for good interface explanation until I found your channel. And you did best of what you could. Explained interfaces and DI at once, on working example. Fantastic job! Great content, great teaching approach, wide perspective filled with necessary details without overhelming the learner and topic. All the best for you and your channel!

@SkillFoundryIO 4 ай бұрын

Thank you!

@christianfredrickgerman9170 2 ай бұрын

Thanks. You explain DI so clear and simple that even non programmer can understand.

@valnuke 10 күн бұрын

absolutely! I just explained it to my grandma (83 years old, can barely write) and she totally got it.

@Director414 3 ай бұрын

Great video! You really good at explaining stuff, well done! Impressive. Keep up the good work!!

@SkillFoundryIO 3 ай бұрын

Thank you for your kind words!

@joekimbler 3 ай бұрын

Fantastic explanation and example for DI!! You teach both the concept of DI as well as how it is implemented in c#. Simple and to the point. Great job.

@SkillFoundryIO 3 ай бұрын

Thank you for your kind words!

@gregschlitt3847 Ай бұрын

Nice work, with a well chosen example

@HiwashiYT 7 ай бұрын

What an amazing explanation for a very confusing topic to beginners like myself, you even added the testing example that so many people mention but never show! Great work, will definitely follow your channel for more content.

@SkillFoundryIO 7 ай бұрын

Thank you for your kind words!

@user-xp4yq2jd7s 2 ай бұрын

Thank you sir you’ve saved me ❤️ you way of explaining the concept is really amazing and the example itself is simple. Please explain the dependency injection container too 🙏 thanks again

@SkillFoundryIO 2 ай бұрын

You are welcome!

@justHeisen 4 ай бұрын

You have the perfect pace for teaching.

@SkillFoundryIO 4 ай бұрын

Thank you!

@schmidtlach Ай бұрын

I have been searching for weeks and watching tens of videos on the subject. I finally found it on your channel. Thank you for sharing 😂. It's clear to me now. I'm subscribing to your channel 😊.

@SkillFoundryIO Ай бұрын

Glad it was helpful!

@PrettyBlueThings 2 ай бұрын

Excellent explanation!

@aluminatsulana Ай бұрын

This was some incredible explanation! I was realy struggleing with the concept at first but now after the video how I even struggled at the first place! Great video!

@SkillFoundryIO Ай бұрын

Everyone struggles at first my friend

@marceloleoncaceres6826 Ай бұрын

GREAT example, thanks for sharing it!

@SkillFoundryIO Ай бұрын

You are welcome!

@investinglearningmachine3951 4 ай бұрын

Hey, this is the best explanation and examples. Thank you so much!

@SkillFoundryIO 4 ай бұрын

You are welcome!

@Krissini 3 ай бұрын

fantastic video, beautifuly explained and an easy to follow and recode example. Thank you!

@SkillFoundryIO 3 ай бұрын

Thank you!

@Salvotation 9 ай бұрын

I’m learning programming as a hobbyist and to make my work life easier. I am at the stage where I have learnt the basic C# syntax and solving individual problems. Now trying to start learning OOP, this is a really helpful approach to start understanding it’s uses!

@SkillFoundryIO 9 ай бұрын

Stay motivated! OOP is the hardest part, once you get it the rest is not nearly as difficult to learn.

@StefanoTurcarelli 2 ай бұрын

Thank you so much for this amazing example!

@SkillFoundryIO 2 ай бұрын

You're very welcome!

@martinroa 2 ай бұрын

This video is gold.

@ernestocampese Ай бұрын

Very well explained. Great job, thank you 👍

@SkillFoundryIO Ай бұрын

Thank you for your kind words!

@alfonzo6320 Ай бұрын

This is an excellent video!

@randallholmes4282 7 ай бұрын

Beautiful! Thank you!

@SkillFoundryIO 7 ай бұрын

You are welcome!

@Speak4Yourself2 9 ай бұрын

NIce tutorial! Thanks a lot! Promising channel.

@SkillFoundryIO 9 ай бұрын

Thank you for the kind words!

@user-li2dm5rz6l 3 ай бұрын

this was amazon explanation, I love it, thank you

@SkillFoundryIO 3 ай бұрын

You are welcome!

@bamf75 3 ай бұрын

really nicely done...any chance you could do a DI container video?

@userman444 4 ай бұрын

Thank you! Found something new :)

@SkillFoundryIO 4 ай бұрын

You are welcome

@Mamika_AFK 9 ай бұрын

Another great video! Keep it up! 😄👍

@SkillFoundryIO 9 ай бұрын

Thanks! Will do!

@user-dy1nf2ht9x Ай бұрын

Amazing video 👌👌

@user-dy1nf2ht9x 2 ай бұрын

Great video

@ce1tzu 7 сағат бұрын

Gold content!

@waynegreen7970 5 ай бұрын

Good content!

@EMdragonKnight 10 күн бұрын

Can you do a video on the concept of "Clean Code". Also utilizing abstract classes and interfaces to achieve clean code. I've been interviewing a lot lately and Object Oriented Design style interviews have been creeping up a lot (Amazon famous for it). I personally would love it if you did.

@SkillFoundryIO 4 күн бұрын

I have an SRP video as well, but I haven't had time to get to the rest yet. It'll happen someday.

@SeraphixD3 9 ай бұрын

Nicely explained

@SkillFoundryIO 9 ай бұрын

Thank you!

@ninjask8ter 8 ай бұрын

This video was a great refresher especially after being away from it for so many years! Is there any available code so I can save?

@SkillFoundryIO 8 ай бұрын

Sorry, I haven't set up a GitHub repository for the KZfaq channel. Honestly didn't think about it. I'll put that on my list of things to do this month.

@mahmoudmohammed9287 9 ай бұрын

Nice explanation keep it up❤

@SkillFoundryIO 9 ай бұрын

Thanks 🙂

@ElCidPhysics90 3 күн бұрын

Thanks for this video. Seems strange to have the actual console, the view, inside of an interface class? Does that restrict how the human player is implemented? What if you were moving this to a WPF app?

@SkillFoundryIO 3 күн бұрын

Yes I was just demonstrating DI. I think going full separation of concerns would be distracting to the learner.

@ahmedh2482 Ай бұрын

you are awesome

@joelmatthews3255 Ай бұрын

Great video. My only recommendation is to maybe forgo the background music. I personally found it a little distracting while trying to concentrate on your voice at times.

@SkillFoundryIO Ай бұрын

Good feedback, thank you!

@Decapodd 27 күн бұрын

made me smile

@CHURUTEInternational 5 ай бұрын

2 questions. are you in your bath tub? and does this work the same if I want to use dependency injection in xamarin forms or MAUI?

@SkillFoundryIO 5 ай бұрын

1. I’ve been upgrading my gear. Didn’t want to over invest if the channel didn’t take off. 2. Yes it works the same.

@LuisSieira Ай бұрын

Very good video. Just... I'm not fan of the Iplayer nomenclature... the client of the API you defined does not care if it is interacting with an interface or an implementation. You manager talks to a Player, not to an IPlayer. Same way you interact with a List, not an Ilist, that you can new ArrayList, but the list is not an IList, and the ArrayList is not a ListImpl (I am not fan of the PlayerImpl either). You have a public interface Player, and a public class HumanGamer implements Player, and a BipBoopRandomGambler implements Player...

@SkillFoundryIO Ай бұрын

That’s mostly a c# thing. Most devs use the I prefix.

@666nevermore 7 күн бұрын

Why is this an interface? Why not a class Player that has a choice and then the 2 classes human and computer derive from player? I mean why an interface? It sounds more logic to me to be a class. I’m genuinely asking

@SkillFoundryIO 7 күн бұрын

There’s a few reasons. What you suggest is polymorphic so you could substitute. However inheritance is an is-a relationship while choosing a type is a can-do. It is more modular and testable to be an interface implementation.

@666nevermore 7 күн бұрын

@@SkillFoundryIO yes and thank you. I was just wondering if you could use the same injection pattern but using inheritance instead of interfaces

@user-vi7xn1tj9f 26 күн бұрын

lol. a switch statement anyone?

@SAAbir-si8wk Ай бұрын

I can never thank you enough! God, It's a gem! The example, the explanation, the accent, the pace.... it's perfect! damn! 🤌🤌 One other thing. The background sound-track is so soothing! What's the track name?

@SkillFoundryIO Ай бұрын

Not sure on the music, my editor uses epidemic sound subscription. They have a lot of music like that.