Dependency Injection in C# ❘ A Hands-On Guide to Boosting Code Flexibility and Testability
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- čas přidán 23. 08. 2023
- 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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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
Absolutely! I left that term off the video because most novices only hear about the injection part. 😇
Thanks for adding more information!
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!
Everyone struggles at first my friend
That was the easiest most clear explanation i found so far, thank you so much!
You are very welcome!
Thanks. You explain DI so clear and simple that even non programmer can understand.
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.
Thank you!
GREAT example, thanks for sharing it!
You are welcome!
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.
Thank you for your kind words!
I agree on the virtual methods as well, it’s a smelly pattern.
@@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 :)
This video is gold.
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.
Thank you for your kind words!
Excellent explanation!
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.
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.
Eric you are an AMAZING teacher!
Sincerely, a former teacher turned programmer :)
Thank you!
Very well explained. Great job, thank you 👍
Thank you for your kind words!
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
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!
Thank you so much for this amazing example!
You're very welcome!
Best explanation so far. So glad I found your video. Thanks
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 😊.
Glad it was helpful!
Nice work, with a well chosen example
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.
Thank you for your kind words!
Hey, this is the best explanation and examples. Thank you so much!
You are welcome!
This is an excellent video!
saw this in a Job Description and Now seeing it on CZcams all in less than 2 hours, The gods wanted me to learn this
Hope it helped! If you want to go deeper into it in C#, check out our main site.
You have the perfect pace for teaching.
Thank you!
Beautiful! Thank you!
You are welcome!
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
You are welcome!
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!
Thank you!
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!
Stay motivated! OOP is the hardest part, once you get it the rest is not nearly as difficult to learn.
Amazing video 👌👌
NIce tutorial! Thanks a lot! Promising channel.
Thank you for the kind words!
Great video
Good content!
fantastic video, beautifuly explained and an easy to follow and recode example. Thank you!
Thank you!
Great video! You really good at explaining stuff, well done! Impressive. Keep up the good work!!
Thank you for your kind words!
this was amazon explanation, I love it, thank you
You are welcome!
Another great video! Keep it up! 😄👍
Thanks! Will do!
Thank you! Found something new :)
You are welcome
really nicely done...any chance you could do a DI container video?
Nicely explained
Thank you!
you are awesome
Nice explanation keep it up❤
Thanks 🙂
made me smile
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?
Sorry, I haven't set up a GitHub repository for the CZcams channel. Honestly didn't think about it. I'll put that on my list of things to do this month.
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.
Good feedback, thank you!
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?
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.
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...
That’s mostly a c# thing. Most devs use the I prefix.
lol. a switch statement anyone?
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?
Not sure on the music, my editor uses epidemic sound subscription. They have a lot of music like that.