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Learning to Develop APIs in.NET

Posted on by Pablo Francesco

APIs are the foundation of software communication in the world of cloud-native apps and distributed systems of today. Building scalable and maintainable applications as a.NET developer requires an understanding of API development. This post explains the principles and best practices to adhere to while creating APIs with ASP.NET Core.

Setting Up Your Project

Start by creating a new ASP.NET Core Web API project in Visual Studio or using the CLI.

dotnet new webapi -n MyAwesomeAPI

Folder Structure (Recommended).

  • Controllers/
  • Services/
  • Repositories/
  • Models/
  • DTOs/
  • Middleware/

Use dependency injection and keep concerns separated for maintainability.

Best Practices

Use Layered Architecture.

Separate your application into layers.

  • Controller: Accepts requests and returns responses.
  • Service: Contains business logic.
  • Repository: Handles data persistence.

Clean Code and DTOs

  • Use Data Transfer Objects (DTOs) to expose only the necessary data.
  • Use AutoMapper for mapping entities to DTOs.

Exception Handling

Implement global exception handling using middleware.

app.UseExceptionHandler("/error");

Or create custom middleware for centralized error logging.

API Versioning

Use the NuGet package Microsoft.AspNetCore.Mvc.Versioning.

services.AddApiVersioning(config =>
{
    config.DefaultApiVersion = new ApiVersion(1, 0);
    config.AssumeDefaultVersionWhenUnspecified = true;
    config.ReportApiVersions = true;
});

Secure Your API

  • Use authentication (JWT, OAuth).
  • Apply role-based or claims-based authorization.

Testing and Debugging Tips

  • Swagger: Built-in for API documentation.
  • Postman: For manual endpoint testing.
  • xUnit/Moq: For unit testing controllers and services.

Deployment Overview

  • IIS: Traditional hosting.
  • Docker: Containerized deployment.
  • Azure App Services: Cloud deployment with CI/CD.

Sample Code (Simplified)

// Controller
[ApiController]
[Route("api/[controller]")]
public class ProductsController : ControllerBase
{
    private readonly IProductService _service;

    public ProductsController(IProductService service)
    {
        _service = service;
    }

    [HttpGet]
    public async Task<IActionResult> GetAll()
    {
        return Ok(await _service.GetAllAsync());
    }
}
// Service
public class ProductService : IProductService
{
    private readonly IProductRepository _repo;

    public ProductService(IProductRepository repo)
    {
        _repo = repo;
    }

    public async Task<IEnumerable<ProductDto>> GetAllAsync()
    {
        var products = await _repo.GetAllAsync();
        return products.Select(p => new ProductDto { Id = p.Id, Name = p.Name });
    }
}

Conclusion

Clean, well-structured APIs not only reduce technical debt but also enhance collaboration across teams. Follow these best practices, and you’ll be delivering robust APIs that scale easily and are simple to maintain. Questions or feedback? Drop them in the comments and let’s learn together!

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