Building REST APIs with ASP.NET Core

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Building REST APIs with ASP.NET Core

In today’s modern web development, REST APIs have become a standard for enabling client-server communication. ASP.NET Core, a cross-platform, high-performance framework from Microsoft, is a powerful choice for building scalable and maintainable RESTful services.

Why ASP.NET Core for REST APIs?

ASP.NET Core offers several key advantages for API development:

Cross-platform support (Windows, Linux, macOS)

High performance due to its lightweight and modular architecture

Built-in dependency injection

Robust routing and middleware support

Built-in Swagger/OpenAPI support for API documentation

Getting Started

To build a REST API with ASP.NET Core, start by creating a new Web API project:

bash

dotnet new webapi -n ProductApi

cd ProductApi

dotnet run

This scaffolds a project with example controller and configuration.

Define a Model

csharp

public class Product

{

    public int Id { get; set; }

    public string Name { get; set; }

    public decimal Price { get; set; }

}

Create a Controller

csharp

[ApiController]

[Route("api/[controller]")]

public class ProductsController : ControllerBase

{

    private static List<Product> products = new List<Product>();

    [HttpGet]

    public ActionResult<IEnumerable<Product>> Get() => products;

    [HttpPost]

    public IActionResult Post(Product product)

    {

        products.Add(product);

        return CreatedAtAction(nameof(GetById), new { id = product.Id }, product);

    }

    [HttpGet("{id}")]

    public ActionResult<Product> GetById(int id)

    {

        var product = products.FirstOrDefault(p => p.Id == id);

        if (product == null) return NotFound();

        return product;

    }

    [HttpPut("{id}")]

    public IActionResult Put(int id, Product updatedProduct)

    {

        var product = products.FirstOrDefault(p => p.Id == id);

        if (product == null) return NotFound();

        product.Name = updatedProduct.Name;

        product.Price = updatedProduct.Price;

        return NoContent();

    }

    [HttpDelete("{id}")]

    public IActionResult Delete(int id)

    {

        var product = products.FirstOrDefault(p => p.Id == id);

        if (product == null) return NotFound();

        products.Remove(product);

        return NoContent();

    }

}

Testing with Swagger

ASP.NET Core enables Swagger by default. Run the app and navigate to https://localhost:<port>/swagger to test your API interactively.

Conclusion

ASP.NET Core makes it easy to build robust, maintainable REST APIs. With built-in support for routing, JSON serialization, dependency injection, and Swagger, developers can quickly create modern APIs that scale. Whether you’re building microservices or mobile backends, ASP.NET Core is a reliable and efficient platform to work with.

 Read More 

Introduction to .NET Core for Full Stack Developers

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