ASP.NET Core | Developer Resources

What is ASP.NET Core?

ASP.NET Core is a cross-platform, high-performance framework for building modern, cloud-based, internet-connected applications. It's redesigned from the ground up to be fast, flexible, and modular.

Key Features

High Performance: One of the fastest web frameworks in TechEmpower benchmarks
Cross-Platform: Develop and deploy on Windows, Linux, and macOS
Unified Framework: Build web UI and web APIs with the same tooling
Built-in DI: Dependency injection is a first-class citizen

Minimal APIs

Create lightweight APIs with minimal code:

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () => "Hello World!");

app.MapGet("/users/{id}", (int id) => 
    new User(id, $"User {id}"));

app.MapPost("/users", (User user) => 
    Results.Created($"/users/{user.Id}", user));

app.Run();

record User(int Id, string Name);
            

Controllers and MVC

For larger applications, use controllers:

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

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

    [HttpGet]
    public async Task<ActionResult<IEnumerable<Product>>> GetAll()
    {
        var products = await _service.GetAllAsync();
        return Ok(products);
    }

    [HttpGet("{id}")]
    public async Task<ActionResult<Product>> GetById(int id)
    {
        var product = await _service.GetByIdAsync(id);
        return product is null ? NotFound() : Ok(product);
    }
}
            

Middleware Pipeline

Configure request processing with middleware:

var builder = WebApplication.CreateBuilder(args);

// Add services
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure middleware
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();

app.Run();
            

Getting Started

Create a new web API: dotnet new webapi -n MyApi
Add Entity Framework Core for data access
Implement authentication with Identity or JWT
Deploy to Azure App Service or containers