Dependency Injection Deep Dive | .NET & C# Essentials

In today's video we'll dive into Dependency Injection in .NET & ASP.NET.
We'll cover almost everything you need to know about integrating dependency injection in your applications from the various lifetimes to every single configuration method on the dependency injection Inversion of Control (IoC) container.
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0:00. Opening
0:59. Registering controllers
2:43. Registering services
7:18. Implementing what ASP.NET does using the IServiceCollection and the ServiceProvider
09:10. Transient lifetime
11:21. Singleton lifetime
18:38. Scoped lifetime
27:35. Multiple Registrations
30:16. Keyed services
32:44. TryAdd methods
34:20. Service descriptor and the Add method
35:20. TryAddEnumerable

[@amantinband]

Cheers 🥂 0:00. Opening 0:59. Registering controllers 2:43. Registering services 7:18. Implementing what ASP.NET does using the IServiceCollection and the ServiceProvider 09:10. Transient lifetime 11:21. Singleton lifetime 18:38. Scoped lifetime 27:35. Multiple Registrations 30:16. Keyed services 32:44. TryAdd methods 34:20. Service descriptor and the Add method 35:20. TryAddEnumerable

[@voidmice1669]

Finally cleared out for me the difference between AddScoped and AddTransient. Thanks! 😊

[@lucaciandrei]

very clear and concise explanations, congrats and to many more tutorials

[@martinlabastie3518]

This sereies is amazing, please never stop

[@shahzadahmad-vg2ou]

Absolutely fantastic tutorial! The depth of explanation is unparalleled. Keep up the great work!

[@user-dg5qy3cq8m]

In my opinion the best tutor for explaining complex topics in easy steps without skipping important details

[@HackerUC]

Best explanation I've heard on DI. 👍🏼

[@sushilb7994]

Yet another wonderful video from Amichai ❤ thank you…

[@EzequielBinker]

Excellent video Amichai. You're great!!

[@longuinni]

Really nice introtuction to DI.

[@greekplayback]

תודה אלוף

[@mckayanderson2046]

So good Amichai! I'll be purchasing your courses and recommending to friends. Have you dug into Microsoft's Semantic Kernel yet? The documentation and current tutorials from the team are really scattered and confusing and I didn't find a single good example of applying good DDD and Clean Architecture. I won't need it by the time you're done, but it might be a good opportunity for you.

[@naftalyweinberger7892]

thanks amichai, i like when u talk fast, its more easy.

[@aldkdenedik2451]

Really nice

[@vascofernandes6192]

Fantastic video

[@Andy01010]

Great stuff, tbh you have a good chance to lead the c# and .net learning for us mortals. The more people understand it the more it is used

[@Philippe42460]

Hi Amichai, Thank you very much for this very good introduction to service registration, this will be very useful for my new colleagues. 👍

[@neroamayo6345]

Great content. Please keep it up.😇😇

[@joshmeyers2034]

I always share your videos with my team. So detailed and easy to digest. What kind of annotating tool do you use? I can't find anything remotely like it other than zoomit 🙂

[@gerardwisse406]

Another great video. Thx for sharing and keep up the good work. And just out of curiosity, what tool do u use to draw those colorful arrows and rectangles?

[@DavidSmith-ef4eh]

I wish we had such things in PHP. In php di system, everything is just a singleton, had to create my own DI service to be able to have factories/transient services. Maybe in 20 years, php will catch up to this.

[@shayvt]

Thank you Amichai for another great video. Regarding keyed services - is it ok to use it or is it a code smell? When I have more than one implementation, I usually create a factory class, register the factory and the implementations in the container, get the IEnumerable to the factory, and use the factory to pick the implementation. What do you think? Another thing - do you know if there is an option to register all the implementations of an interface from an assembly? I saw it in other container and I think it could be very useful. תודה 🙂

[@allwinantofranklin895]

Can you share how to implement DI in .NET Framework. It will be very useful for lot of Company who are struck with Framework. I think with using DI in Framework we can refactor the code to match .NET Core style and make the migration process easy... What is your opinion in this?

[@alexandernava9275]

I am confused on the lifetime of a single request for scoped. What is that? Like is there a timeout for each "session" on a browser?

[@ivandrofly]

What is the name of the tool that you are using for highlighting and creating arrows? PS: I've been using ZoomIt from Microsoft Sysinternals

[@seba123321]

Can you recommend a solution/library/helper for scenario where you have a lot of classes and corresponding interfaces. Scan of dlls and bulk registration. Registration by conversion: IService1 and Service1. I'm sure that there must be an easy way to do that.

[@amantinband]

I have a video in my backlog on dynamic DI registration using a few different NuGet packages

[@thijsvandervegt3377]

Hey Amichai 👋 , any chance you're making a Deep Dive course on DDD on Dometrain sometime soon?

[@amantinband]

Working on it as we speak 💪🏼

[@maheshgangineni4860]

Nice video , can you share the extensions that you use for dotnet development?

[@amantinband]

This is pretty similar to what I’m using today: kzbin.info/www/bejne/o2qrp6Z4ZpKbd9Esi=TKZqbOSktM_Y5FHl

[@az6876]

This video can be defined as a reference to definitively understand dependency injection in c#. Can I ask you what you think about the class constructor in C# defined like this: public class NumbersController(NumberService numberService) { private readonly NumberService numberService = numberService; // also I can add ?? throw new ArgumentNull... ... } Thanks

[@amantinband]

Looks good, but the exception throwing is redundant since the DI container with throw an exception if it cannot resolve a dependency

[@az6876]

@@amantinband Thank you

[@parkerwarner8688]

Are keyed services essentially an implementation of the factory pattern or am I misunderstanding that?

[@amantinband]

Not exactly

[@parkerwarner8688]

@@amantinband would love to hear more, thanks!

[@shayvt]

Do you prefer vscode over vs or rider?

[@amantinband]

Yep