ASP.NET Core Keyed Services SUCK!

ASP.NET Core dependency injection keyed services are not that good, old and gold techniques prevail.

[lavivida]

The Keyed Service seems to be useful in the following scenario:
When an existing service (A) is registered as a single instance (ISvc), but later on, another implementation is registered with the same interface (ISvc) (B), and depending on the situation, you need to provide either A or B.

In such cases, you could change the existing services to be registered as Keyed Services and expose a Resolver that implements ISvc as a regular service.

[TheOneAndOnlySecrest]

One use case I have for them is to expose multiple interfaces on the same instance without having the actual instance accessible from the DI.

So basically what I do for some parts:
class AorB : IA, IB { ... }

var temp = new object();

services.AddTransient<IA>(p => p.GetKeyedService(temp))
services.AddTransient<IB>(p => p.GetKeyedService(temp))

In my logic I actually replicated the options from AutoFac using service registrations, but I guess you get the point. In my case I only want to have IA or IB retrievable but not AorB but this is the class implementing both interfaces so to have a single instance I need to have it accessible from the DI.

Same goes for decorating services and other things.

[johnnm]

with every video, you grow a longer beard 😂

[alkr]

7:23 - How does DI prevent you from using a strategy pattern? Are you assuming that you NEED to pass strategy in a constructor? why?

[nemanjadjordjevic]

I always thought the keyed services were kinda useless since we could do those things easily with just a little bit of code, glad someone finally made a video about it.

[softwaredev]

Hello @RawCoding. Have you ever work with Java/Spring Boot? Your C#/.NET tutorials looks very good.(Just watched 1 video about DI) So i am a junior, i also follow spring boot tutorials. But i can't decide which framework i should choose and stick with it. Have any suggestions about that?

[pedroferreira]

What packages do you use that can mock concrete classes?

[LukeAvedon]

Nice video! My understanding is they just put keyed services in, to match the qualified services (I think) in Java Spring. To have one up on the @Bean people.

[andrewiecisa]

What about injection of classes that aren't yours with different configurations for example?

[ItsSalesGabriel]

Nice video, tkss

You will intend make new courses ?

[ezmooj]

If programmer has a lot of beard he has a lot of work no time to shave 😅