ASP.NET Core is a

free and open-source Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software where anyone is freely licensed to use, copy, study, and change the software in any way, and the source ...

web framework A web framework (WF) or web application framework (WAF) is a software framework that is designed to support the development of web applications including web services, web resources, and web APIs. Web frameworks provide a standard way to build an ...

and successor to ASP.NET, developed by

Microsoft Microsoft Corporation is an American multinational technology corporation producing computer software, consumer electronics, personal computers, and related services headquartered at the Microsoft Redmond campus located in Redmond, Washi ...

. It is a modular framework that runs on both the full

.NET Framework The .NET Framework (pronounced as "''dot net"'') is a proprietary software framework developed by Microsoft that runs primarily on Microsoft Windows. It was the predominant implementation of the Common Language Infrastructure (CLI) until bein ...

, on

Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for se ...

, and the

cross-platform In computing, cross-platform software (also called multi-platform software, platform-agnostic software, or platform-independent software) is computer software that is designed to work in several computing platforms. Some cross-platform software ...

.NET. However, ASP.NET Core version 3 only works on .NET Core, dropping support of the .NET Framework. The framework is a complete rewrite that unites the previously separate

ASP.NET MVC ASP.NET MVC is a web application framework developed by Microsoft that implements the model–view–controller (MVC) pattern. It is no longer in active development. It is open-source software, apart from the ASP.NET Web Forms component, which ...

and ASP.NET Web API into a single

programming model A programming model is an execution model coupled to an API or a particular pattern of code. In this style, there are actually two execution models in play: the execution model of the base programming language and the execution model of the prog ...

. Despite being a new framework, built on a new web stack, it does have a high degree of concept compatibility with ASP.NET. The ASP.NET Core framework supports side-by-side versioning so that different applications being developed on a single machine can target different versions of ASP.NET Core. This is not possible with previous versions of ASP.NET.

Blazor Blazor is a free and open-source web framework that enables developers to create web apps using C# and HTML. It is being developed by Microsoft. Overview Five different editions of Blazor apps have been announced. Blazor Server: These apps ...

is a recent (optional) component to support

WebAssembly WebAssembly (sometimes abbreviated Wasm) defines a portable binary-code format and a corresponding text format for executable programs as well as software interfaces for facilitating interactions between such programs and their host environmen ...

and since version 5.0, it has dropped support for some old web browsers. While current

Microsoft Edge Microsoft Edge is a proprietary, cross-platform web browser created by Microsoft. It was first released in 2015 as part of Windows 10 and Xbox One and later ported to other platforms as a fork of Google's Chromium open-source project: Android ...

works, the legacy version of it, i.e. "

Microsoft Edge Legacy Microsoft Edge is a proprietary, cross-platform web browser created by Microsoft. It was first released in 2015 as part of Windows 10 and Xbox One and later ported to other platforms as a fork of Google's Chromium open-source project: Android ...

" and

Internet Explorer 11 Internet Explorer 11 (IE11) is the eleventh, final, and now deprecated version of the Internet Explorer web browser. It was initially included in the release of Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 on October 17, 2013, and was ...

are dropped when you use Blazor.

Release history

Naming

Originally deemed ASP.NET vNext, the framework was going to be called ASP.NET 5 when ready. However, in order to avoid implying it is an update to the existing ASP.NET framework, Microsoft later changed the name to ASP.NET Core at the 1.0 release.

Features

* No-compile developer experience (i.e. compilation is continuous, so that the developer does not have to invoke the compilation command) * Modular framework distributed as

NuGet NuGet (pronounced "New Get")And The Winner Is, NuGet
haacke ...

packages * Cloud-optimized runtime (optimized for the internet) * Host-agnostic via Open Web Interface for .NET (OWIN) support – runs in

IIS IIS may refer to: Organizations * Indian Information Service, of the Government of India * Institute of Information Scientists, a professional association now merged into the Chartered Institute of Library and Information Professionals, UK * Inst ...

or standalone * A unified story for building web UI and web APIs (i.e. both the same) * A cloud-ready environment-based configuration system * A light-weight and modular HTTP request pipeline * Build and run cross-platform ASP.NET Core apps on Windows, Mac, and Linux * Open-source and community-focused * Side-by-side app versioning when targeting .NET * In-built support for dependency injection

Components

* Entity Framework (EF) Core * Identity Core * MVC Core *

Razor A razor is a bladed tool primarily used in the removal of body hair through the act of shaving. Kinds of razors include straight razors, safety razors, disposable razors, and electric razors. While the razor has been in existence since bef ...

Core *

SignalR SignalR is a free and open-source software library for Microsoft ASP.NET that allows server code to send asynchronous notifications to client-side web applications. The library includes server-side and client-side JavaScript components. Details ...

* Kestrel web server

References

External links

*
ASP.NET
on

GitHub GitHub, Inc. () is an Internet hosting service for software development and version control using Git. It provides the distributed version control of Git plus access control, bug tracking, software feature requests, task management, cont ...