C#•4y ago

dependency injection net framework

hi all, I'm following a reference on how to use dependency injection in net framework
https://stackoverflow.com/questions/43311099/how-to-create-dependency-injection-for-asp-net-mvc-5

i tried to implement the solution the way they register the services, but when i run the controller i saw that the Interface is not initialized.. even though when i try to debug, the program run through the initialization part like this

services.AddScoped<IDailyConversion, DailyConversion>();

services.AddScoped<IDailyConversion, DailyConversion>();

... does anyone have any idea maybe what could be the issue..?

Stack Overflow

How to create dependency injection for ASP.NET MVC 5?

Creating Dependency Injection with ASP.NET Core is fairly easy. The documentation explains it very well here and this guy has a killer video to explain it.

However, I want to do the same thing wit...

Yawnder•9/18/22, 3:15 AM

Yawnder•9/18/22, 3:16 AM

It doesn't matter if inherit from or not, the registration has to be exact.

hellounlimitedOP•9/18/22, 3:17 AM

my bad, i mistype the name, yup.. it should be (edited the message)

services.AddScoped<IDailyConversion, DailyConversion>();

services.AddScoped<IDailyConversion, DailyConversion>();

Mmanseternalquest can you share the snapshot of this IDailyConversation? This may sound silly, bu...

hellounlimitedOP•9/18/22, 3:21 AM

yes.. actually i implemented the interface..

hellounlimitedOP•9/18/22, 3:22 AM

tbh.. i tested the code works in net core, but for some reason i have to do it in net framework, so i try to move the code, register all the service and all in net framework way... but somehow i got null value...

Mmanseternalquest The implementation is correct and since you have mentioned that it works in .Net...

hellounlimitedOP•9/18/22, 4:05 AM

im using net framework 4.8 version.. will net version affect the dependency injection implementation (like it can't be used in a certain version..)?

Original message was deleted

hellounlimitedOP•9/18/22, 5:07 AM

@Yawnder @MansEternalQuest can i understand.. is it not possible to pass Interface to a controller constructor (in net framework) like above..?

Yawnder•9/18/22, 5:14 AM

Not too sure why you would say that, but no.

Yawnder•9/18/22, 5:17 AM

@qian Can you show your registrations? All of them.

YYawnder @qian Can you show your registrations? All of them.

hellounlimitedOP•9/18/22, 5:19 AM

yup.. it's a bit long so i do screenshots instead of copying the code.. here are the services that are registered..

YYawnder Not too sure why you would say that, but no.

hellounlimitedOP•9/18/22, 5:20 AM

actually because only after i added an empty constructor for this DailyConversion controller it will works, but not the constructor with interface parameter inside.. so i wondering if it's different in net framework..

Yawnder•9/18/22, 5:20 AM

If you put a breakpoint in your , does it hit it properly?

Yawnder•9/18/22, 5:21 AM

What does your Controller look like? (the class definition and the constructor)

YYawnder If you put a breakpoint in your `AddControllersAsServices`, does it hit it prope...

hellounlimitedOP•9/18/22, 5:22 AM

yes.. it does..

Yawnder•9/18/22, 5:22 AM

You do . If you're trying to inject an interface, this will not work.

YYawnder What does your Controller look like? (the class definition and the constructor)

hellounlimitedOP•9/18/22, 5:22 AM

my controller looks like this..

Hhellounlimited yes.. it does..

Yawnder•9/18/22, 5:22 AM

No, I mean inside . Do you see it hit the controller registration.

Yawnder•9/18/22, 5:23 AM

Ok. Remove that parameterless constructor

Yawnder•9/18/22, 5:23 AM

Change for like it was before.

YYawnder No, I mean inside `AddControllersAsServices`. Do you see it hit the controller r...

hellounlimitedOP•9/18/22, 5:24 AM

yup.. it enter the class as well..

Yawnder•9/18/22, 5:24 AM

Inside the foreach. Can you see ?

Yawnder•9/18/22, 5:25 AM

(The answer is probably no)

YYawnder Inside the foreach. Can you see `type == typeof(DailyController)` ?

hellounlimitedOP•9/18/22, 5:26 AM

no.. it doesnt enter inside the for loop...

Yawnder•9/18/22, 5:26 AM

So it means your lambda filters it out.

Yawnder•9/18/22, 5:26 AM

Can you just add on your controller and try again?

Yawnder•9/18/22, 5:27 AM

(Maybe it's not registering it as implementing because inherits from it, and not directly.)

Yawnder•9/18/22, 5:30 AM

But that wouldn't change anything actually.

Yawnder•9/18/22, 5:31 AM

Can you explicitly register your controller and try again?

Hhellounlimited yup.. it enter the class as well..

hellounlimitedOP•9/18/22, 5:35 AM

the program still doesnt enter this loop

Yawnder•9/18/22, 5:35 AM

No.

Yawnder•9/18/22, 5:35 AM

It's normal that it doesn't enter the loop.

hellounlimitedOP•9/18/22, 5:36 AM

still the same message from the browser with parameterless constructor..

Yawnder•9/18/22, 5:37 AM

I really feel like your whole project is setup wrong, but it's hard to say with bits and pieces.

hellounlimitedOP•9/18/22, 5:38 AM

im not sure if this part could be an issue..

because this part im following the link from stackoverflow.. but then i found another version of answer from stackoverflow that we dont use "StartUp"..

https://stackoverflow.com/questions/54584671/dependency-injection-in-net-4-7

YYawnder I really feel like your whole project is setup wrong, but it's hard to say with ...

hellounlimitedOP•9/18/22, 5:39 AM

i think im able to setup a new project.. is it the issue with web application project that i setup?

Hhellounlimited im not sure if this part could be an issue.. ``` services.AddContr...

hellounlimitedOP•9/18/22, 5:40 AM

Hhellounlimited i think im able to setup a new project.. is it the issue with web application pr...

Yawnder•9/18/22, 5:40 AM

No idea what the issue is. You have all the information, and all I have are bits and pieces through screenshots.

YYawnder No idea what the issue is. You have all the information, and all I have are bits...

hellounlimitedOP•9/18/22, 5:40 AM

is it possible if i push the project to github for you to see clearer.. is that okay?

Yawnder•9/18/22, 5:41 AM

Nah, I already spent enough time on that, I need to go to bed, sorry.

hellounlimitedOP•9/18/22, 5:43 AM

Okay