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ASP.NET Core - Overview

What is ASP.NET Core?

ASP.NET Core is a web framework created by Microsoft for building web applications, APIs, and microservices. It uses common patterns like MVC (Model-View-Controller), dependency injection, and a request pipeline comprised of middleware. It's open-source under the Apache 2.0 license, which means the source code is freely available, and the community is encouraged to contribute bug fixes and new features.

ASP.NET Core runs on top of Microsoft's .NET runtime, similar to the Java Virtual Machine (JVM) or the Ruby interpreter. You can write ASP.NET Core applications in a number of languages (C#, Visual Basic, F#). C# is the most popular choice. You can build and run ASP.NET Core applications on Windows, Mac, and Linux.

Why do we need another web framework?

There are a lot of great web frameworks to choose from already: Node/Express, Spring, Ruby on Rails, Django, Laravel, and many more. What advantages does ASP.NET Core have? 

  1. Speed. ASP.NET Core is fast. Because .NET code is compiled, it executes much faster than code in interpreted languages like JavaScript or Ruby. ASP.NET Core is also optimized for multithreading and asynchronous tasks. It's common to see a 5-10x speed improvement over code written in Node.js.

  2. Ecosystem. ASP.NET Core may be new, but .NET has been around for a long time. There are thousands of packages available on NuGet (the .NET package manager; think npm, Ruby gems, or Maven). There are already packages available for JSON deserialization, database connectors, PDF generation, or almost anything else you can think of.

  3. Security. The team at Microsoft takes security seriously, and ASP.NET Core is built to be secure from the ground up. It handles things like sanitizing input data and preventing cross-site request forgery (CSRF) attacks, so you don't have to. You also get the benefit of static typing with the .NET compiler, which is like having a very paranoid linter turned on at all times. This makes it harder to do something you didn't intend with a variable or chunk of data. 
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