C#•3y ago

✅ I need feedback to try to improve [.Net API]

Hey, I'm studiyng a lot of .Net backend in this year and I have applied for a lot of intern and junior positions recently. I did a lot of tests, but most of them don't give me any feedback :/

I need anyone good at .Net API that can check a repository, I'd really appreciate feedback on what I'm getting wrong and what I need to improve and study. I know I'm just a beginner.
Studying is important, but without feedback I feel directionless.
I'd like feedback on my last test:
https://github.com/Jvramiro/tech-test-backend-csharp

Sorry about the readme in portuguese, I'll try updating to two languages
And sorry if this is the wrong place to post it :/

Angius•9/21/23, 5:32 PM

It's weird that you select the database that should be used when creating a product

Angius•9/21/23, 5:33 PM

It's usually not how it works

Angius•9/21/23, 5:34 PM

If (and that's a big if) you plan on the database to be swappable, you create some sort of a repository and inject that

Angius•9/21/23, 5:34 PM

So you would have a service that gets a IDatabaseIDatabase of some sort

Angius•9/21/23, 5:35 PM

And then you would .AddScoped<IDatabase, SqlDatabase>.AddScoped<IDatabase, SqlDatabase> or .AddScoped<IDatabase, MongoDatabase>.AddScoped<IDatabase, MongoDatabase> etc as needed

Angius•9/21/23, 5:35 PM

That would be how you switch data sources

arion•9/21/23, 10:07 PM

You could use FluentValidation for the validation so that business logic is abstracted away from your controller.

You could use Mapping to map Request Object -> Domain Object -> Response Object
Why you'd want to do this is to provide the consumer a contract they can follow (a blueprint if you want) on what to send and what to expect.

In the end your CreateCreate endpoint could look someting like this:

[HttpPost]
public async Task<IActionResult> Create([FromBody] ProdutoRequest request, DatabaseSelection databaseSelection = 0){


    var produto = request.MapToProduct();
    
    await databaseService.CreateProduto(produto, databaseSelection);

    var response = produto.MapToResponse();

    return Created($"Produto {response.Nome} criado com sucesso", response);
}

[HttpPost]
public async Task<IActionResult> Create([FromBody] ProdutoRequest request, DatabaseSelection databaseSelection = 0){


    var produto = request.MapToProduct();
    
    await databaseService.CreateProduto(produto, databaseSelection);

    var response = produto.MapToResponse();

    return Created($"Produto {response.Nome} criado com sucesso", response);
}

additionally, you might want to have your CreateProduto method return a TaskTask instead of voidvoid (async void) (I would also rename that method to something like CreateProdutoAsyncCreateProdutoAsync zerotwo_shrug

Angius•9/21/23, 10:13 PM

Oof, I didn't even notice that async voidasync void. Yeah, that's a big no-no

AAngius That would be how you switch data sources

NophiOP•9/21/23, 11:22 PM

Thanks, I really need to study and use Interfaces more

Aarion You could use FluentValidation for the validation so that business logic is abst...

NophiOP•9/21/23, 11:24 PM

Hmmmm that async void was from a course that I studied, thanks ^^

arion•9/21/23, 11:33 PM

arion•9/21/23, 11:33 PM

async voidasync void is typically used in UI applications

arion•9/21/23, 11:37 PM

Here's a really good video explaining the differences about the two

YouTubeNick Chapsas

Stop using async void in C#! Do this instead.

Use code REST15 for 15% off the new From Zero to Hero - REST APIs in .NET course: https://bit.ly/restchapsas

Become a Patreon and get source code access: https://www.patreon.com/nickchapsas

Hello everybody I'm Nick and in this video I will show you why you should not be using async void in C#. It is a very common mistake that can have very cat...

NophiOP•9/21/23, 11:40 PM

Nice, I'll watch

Angius•9/21/23, 11:41 PM

tl;dr: unless you're working with a desktop UI framework like WPF or Winforms, async voidasync void should be banned from the codebase

Accord•9/22/23, 11:42 PM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.

Accord•9/23/23, 11:45 PM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.

✅ I need feedback to try to improve [.Net API]

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