Historical Overview of .NET Framework, Open‑Source Milestones, and the Evolution of .NET Core

On June 27, 2016, Microsoft announced the release of .NET Core and ASP.NET Core 1.0 at the Red Hat DevNation conference, marking the long‑awaited cross‑platform and open‑source strategy for .NET developers.

.NET Framework Development History

完整版本号

发行日期

Visual Studio

Windows 默认安装

1.0

1.0.3705.0

2002-02-13

Visual Studio .NET 2002

Windows XP Media Center Edition

Windows XP Tablet PC Edition

1.1

1.1.4322.573

2003-04-24

Visual Studio .NET 2003

Windows Server 2003

2.0

2.0.50727.42

2005-11-07

Visual Studio 2005

3.0

3.0.4506.30

2006-11-06

Windows Vista

Windows Server 2008

3.5

3.5.21022.8

2007-11-19

Visual Studio 2008

Windows 7

Windows Server 2008 R2

4.0

4.0.30319.1

2010-04-12

Visual Studio 2010

4.5

4.5.40805

2012-02-20

Visual Studio 2012 RC

Windows 8 RP

Windows Server 8 RC

The original .NET 1.0 (released in 2002) has evolved over fourteen years to the latest .NET 4.5, while Visual Studio has progressed from 2002 to 2015.

Key Open‑Source Milestones

2008 – .NET Framework officially open‑sourced.

2012 – ASP.NET MVC, Razor, and Web API open‑sourced.

2014 – Microsoft open‑sourced the entire server‑side .NET stack, including ASP.NET, the .NET compiler, .NET Core Runtime, and libraries, enabling cross‑platform use on Windows, Linux, and macOS.

2015 – Visual Studio Code released as an open‑source editor.

2016 – Xamarin acquired and open‑sourced, further expanding cross‑platform capabilities.

These initiatives, largely driven by CEO Satya Nadella, marked a dramatic shift in Microsoft’s attitude toward open source, revitalizing the .NET ecosystem.

.NET Core Overview

.NET Core is an open‑source, cross‑platform implementation of .NET, distinct from the Windows‑only .NET Framework and the Mono project. It consists of two main components: the .NET Core Framework and the .NET Core Runtime. The source code is hosted on GitHub at https://github.com/dotnet/corefx .

.NET Framework and Mono will be rebuilt on top of .NET Core, meaning .NET Core becomes the foundation for the next generation of .NET, with the traditional .NET Framework serving as the Windows‑specific distribution and Mono as the cross‑platform variant.

The emergence of .NET Core fulfills the long‑standing dream of “any developer, any app, any platform,” allowing developers to target Windows, Linux, macOS, Android, and iOS.

Future Outlook

Historically, .NET suffered from limited cross‑platform support, closed‑source licensing, higher mobile development costs, and lower compensation compared to Java, PHP, and other languages. With .NET Core 1.0, these constraints have been removed, positioning .NET competitively.

Looking ahead, .NET will fully support Windows, Linux, macOS, Android, and iOS; its open‑source ecosystem will continue to grow; and developer remuneration is expected to converge with—or surpass—other language communities.

The article concludes with a curated list of .NET Core learning resources, including Chinese guides, blog series, and official documentation, encouraging newcomers to start with a simple “Hello World” project.