ASP.NET Core

ASP.NET Core is a free, open-source, cross-platform web framework for .NET, built and maintained by Microsoft. It's reported in roughly 19.7% of developer surveys, the #6 most-used web technology worldwide. It's the rewritten, fully open-source successor to classic Windows-only ASP.NET, running natively on Windows, macOS, and Linux, and is used heavily for building high-performance APIs and enterprise web apps in C#.

Example

Modern ASP.NET Core supports Minimal APIs — a whole HTTP endpoint defined in a single Program.cs file, no controllers required.

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

app.MapGet("/api/users/{id}", (int id) =>
{
    return new { Id = id, Name = "Ava Chen" };
});

app.Run();

Getting started

Install the .NET SDK, then scaffold a new web API project with the dotnet CLI.

# scaffold a new minimal Web API project
dotnet new webapi -n MyApi

cd MyApi
dotnet run