Dependency injection and clean service registration | ASP.NET 5 REST API Tutorial 3

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Hello everybody I'm Nick and today I will show you how you can clean up your Startup file. We will make our service registration closed for modification and open for extension.
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#tutorial #rest #api

[@nickchapsas]

My thoughts have changed in this approach ever since, because it doesn't involve things like the order that services might need to be registered. I will be revisiting this in the future.

[@Gxelha]

Correct, but this approach is very neat when the order is not needed.

[@svenkicherer]

looking forward to this as it could be pretty useful as some services need other services registered before themselves.

[@ophir1982]

Maybe a better approach is to use extension methods that encapsulate common service registration and logic and calling them in the order you want. It's not as cool as having those classes automatically register, but it is clean and by the order the developer chose to put it.

[@ophir1982]

@Florin Bobiș Thought about this option, but then you need to start managing this index. And this could be a source for trouble. K.I.S.S

[@anthoniG]

@@ophir1982 This is what I use. I have multiple methods on one extension class, each named for they add (for example AddIdentityCore, AddDatabase, etc) I then just them in the ordered required

[@mac19999x]

God... friday ive been working on adding an Installer to our framework. Sunday, in order to improve a bit im watching your vids, and you're actually doing what im planning to do. The coincidence is just amazing.

[@soucianceeqdamrashti8175]

Really like the clean startup and put everything in their own installer. Easy to add and remove without changing startup. Nice!

[@ViragDesai]

This is simply amazing! So much to learn from you! Fabulous! Thank you, Nick! Your fan now.

[@jaykbg7669]

Very impressive coding skills. I'm enjoying the best practices

[@faridmammadov4277]

Thanks for this tutorials about web services i cant find normal tutorual about this amazing thing. but i understand your videos its very easy and understandable.

[@guroo1000]

Simply brilliant!

[@sunnyokoro]

1000 likes for this. I love your coding pattern, very clean.

[@PatricSjoeoe]

I like this clean solution a lot! thanks :)

[@sundusalharbi5713]

Great video, many thanks

[@max_san2221]

Thanks for this tutorials.

[@ashishdeora8522]

Thank you for this great course, Nick. We love you. However, apparently, there was no need to make it so concise, calling of the services. It's ok to have two lines instead of one. Below type of code looks perfectly fine and works great. What you did would help us to manage an assembly of services while there is actually no need of it now as you are introducing the basics; these optimization techniques should be kept out of scope in my view, just to avoid any feelings of complexes public void ConfigureServices(IServiceCollection services) { new DbInstaller().InstallServices(services, Configuration); new MvcInstaller().InstallServices(services, Configuration); } Thank you once again for your contribution to the community of developers. You are an inspiration

[@cicher]

Also the installers could be statics classes and the install methods extensions of IServicesCollection, then you don't have to instantiate them. This is the approach used with all official SDKs.

[@PelFox]

Neat method. I tend to extend each DI containers to each project in a class named DependencyInjections. So my Data Layer will extend services to add the dependencies needed for that layer. Then in my startup I will run eg) services.AddData(); and services.AddBusiness();

[@denizarca5471]

Hi Nick, was this approach revisited to install things in a certain order? Great series on REST with .NET Core by the way!

[@dormelamed5974]

Great videos my friend, helps a lot! one note, you need to increase the font, it is very hard to understand when it is so small. keep up with your good work man!!

[@henturuk]

thanks very esasy and clear

[@davidpittman9664]

Great approach for cleaning up the startup code. I'm not sure that the DbInstaller would work with a multiple database server environments as the current 'DefaultConnection' only applies to one server/database.

[@akbare-z815]

Very nice sir.

[@shashankpandey1019]

Great man 😍😍 Where were you till now 😬

[@davidmiko1102]

Really nice and clean service registration, really loved it. Also I have a question: Do you think it's a good practice to write doc comments to all methods that I write or just code should be self-descriptive? Really sorry for my english.

[@yuyuewang6405]

OMG, thanks for teaching us this amazing approach, I wander how many approaches like this in numerous projects in the world, it is absolute not friendly to beginners, people will easily get confused, but this is the necessary path to a master. Regarding to services registered order, I think at least we can keep the extension method, and remove foreach, or we can abstract another layer for orderless service than only loop it.

[@ubakangene2067]

please how can i run the services registered without the foreach()

[@yuyuewang6405]

@@ubakangene2067 I also didn't quite get the foreach pare, what I was doing is just use extension method, and register all service one by one like before

[@paladincubano]

Thanks... you are a f.... master

[@MITHUNROYabir]

Thanks for your great in depth rest tutorial. Please make code font a little bigger. It would easy to follow on youtube.

[@Vivalavidapool]

cool approach! I'm curious how'd you unit test your DI registrations and startup class. More importantly, where did you find the documentation and examples how to use startup class and ExportableTypes, Activator.CreateInstance methods. I wanna learn all the features of startup and ways to manipulate it, but I'm struggling to find anything on the web. Thanks Nick!

[@rahmatabadi3839]

He used reflection (dynamic invocation) and it becomes slower. But his idea is great!

[@ubakangene2067]

Nick is awesome and being new to the .Net ecosystem i stumbled on this early enough on my journey,only challenge right now is i am using the Visual Studio 2019 Community and my compiler has a problem with the ForEach(installer => installer.installServices(services, Configuration)), i need solutions to this effect, cause i enjoy practicing this implementation and it has become quite personal.

[@roddydairion7252]

@@ubakangene2067 Late reply to your comment, hopefully it will help others. Somehow in my version of .netcore 2.1, the Method parameters has switched ForEach(installer => installer.installServices(Configuration, services))

[@lekabros]

@@rahmatabadi3839 it’s not his idea, it’s Jason Taylor’s Clean Architecture idea..

[@NuKleArNyPL]

Thanks, my Program.cs is clean now

[@kayandersen2828]

Very cool

[@pooyalaryan4455]

Just WOOOOOOOOOOOOOOOOOOOOOOOOW

[@joergw]

We are using a very similar approach

[@serhiihorun6298]

Thanks

[@thanhtai17]

Hi Nick, How can I Implement Installer in another project without Startup file???

[@Sebastian----]

Isn't this basically the same as modules in ninject or structure map. Normally the code that use the IServiceCollection is minimal, compared to the rest of the DJ. Did i is missed something?

[@jawadahmed7336]

will this work on three layered architecture?

[@prasannahiremath442]

How do you register services in latest version of .Net where we don't have Startup.cs ?

[@hatimazizi218]

hello thank you very much for this course , and i have two question not very close to the tutorial please : does the enterprise use the MVC application or API application ? i know the fundamentals of asp.net core but i d'ont want to waste time learnin stuffs like (razor pages , viewComponent , tagHelper, htmlHelpers ...) can i jump all of this stuff and learn asp.net core api ? :)

[@DeepakShaw]

Hey Nick, Can you make a video on Program.cs cleanup (.net 7). Thanks.

[@nayanchoudhary4353]

Clean, and would work for independent services without any specific conditions! For others, this way can be avoided. Like, registration in a particular order, or registering a single kind of installer.

[@aaronaaronaaron5922]

Hi Nick, thank you very much for this grats videos!! Just one comment, I am having troubles with the resolution of this video :(

[@nickchapsas]

I am so sorry about this. This gets better in future videos. Try to switch it to 1080p.

[@coffee.coyote]

how can you use installers form diffent projects in solution? is there any clean generic way to get IInstallers from all projects in solution?

[@coffee.coyote]

I made it this way: public static IEnumerable GetAssembliesIdExecutingDirectory(Func predicate = null) { if (predicate == null) predicate = asmName => true; string assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location); IEnumerable assembliesPaths = Directory .GetFiles(assemblyFolder, "*.dll") .Where(asmPath => predicate(Path.GetFileName(asmPath))); foreach (string asmPath in assembliesPaths) yield return Assembly.LoadFrom(asmPath); }

[@dayv2005]

Might be a dumb question but when you hover over your variables to auto import their namespace, I don't get the option to auto import. Any idea of what I have set up wrong for this not to work?

[@nickchapsas]

On this video I am using Resharper. It's a feature of this extension. You can read about resharper here: www.jetbrains.com/resharper/

[@RyanTuller]

Look up the hotkey for this. I believe it's "space + enter"

[@dayv2005]

@@nickchapsas Thanks. Will look into this. Also thanks for the quick reply. Going through your playlist for this and loving it so far.

[@nickchapsas]

@@RyanTuller It's Alt+Enter with Resharper

[@stevenbc9597]

What happens when you need to add installers in a specific order?

[@nickchapsas]

Then you bake an order integer for your installers and sort before wiring up

[@abdullahalmousa9181]

I don't understand why you keep the UseMVC() what is the benefit of it ?

[@nickchapsas]

It should be UseMvcCore tbh. It provides some routing

[@diji1102]

why did the clock go from 20 58 to 21

[@bishoynabil5303]

thank you but The font size is too bad

[@anggiangnam2389]

Hy gui, can you upload this video again, this quality is to bad

[@jerryjeremy4038]

Aren't you reinventing the wheel with this approach?

[@adamschneider868]

This is neat, but after I typed it all in I decided to roll back my change and just stick with how it is.

[@josbexerr5166]

Que tal dominio del tema....

[@AlaaOmar]

Hello The font is very small

[@TheCameltotem]

I get that it's more seperated and all but this seems too much work for a whole lot of nothing. I mean you're not touching the startup class too often.

[@nickchapsas]

Are you not? In my experience you are touching it in some form every single time you are adding some piece of functionality in your project. The alternative would be extension methods and when a new group is created you need to go back to it and edit it.

[@IAmTechDevsAspNet]

var installers count 0(zero) in .net core 3.1 how is resolve ?

[@gergocsizmadia7329]

Look at the github source code it updated and it will be resolve your problem. :) That worked for me.

[@velkumars26]

@@gergocsizmadia7329 where is the source ?

[@jhonhernandez9210]

Its really hard to see if you don´t zoom, man

[@expatca4444]

Sorry but this is not needed at all. KISSSSSSSS !!!