ASP.NET Core is an open-source modular web-application framework. It is a redesign of

ASP.NET ASP.NET is a server-side web-application framework designed for web development to produce dynamic web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, applications and services. The name stands for Ac ...

that unites the previously separate ASP.NET MVC 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 p ...

. 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 was not possible with previous versions of ASP.NET. ASP.NET Core initially ran on both the Windows-only .NET Framework and the

cross-platform Within 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 platform, computing platforms. Some ...

.NET The .NET platform (pronounced as "''dot net"'') is a free and open-source, managed code, managed computer software framework for Microsoft Windows, Windows, Linux, and macOS operating systems. The project is mainly developed by Microsoft emplo ...

. However, support for the .NET Framework was dropped beginning with ASP.Net Core 3.0. Blazor is a recent (optional) component to support

WebAssembly WebAssembly (Wasm) defines a portable binary-code format and a corresponding text format for executable programs as well as software interfaces for facilitating communication between such programs and their host environment. The main goal of ...

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

Microsoft Edge Microsoft Edge is a Proprietary Software, proprietary cross-platform software, cross-platform web browser created by Microsoft and based on the Chromium (web browser), Chromium open-source project, superseding Edge Legacy. In Windows 11, Edge ...

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

Microsoft Edge Legacy Microsoft Edge Legacy (often shortened to Edge Legacy), originally released as simply Microsoft Edge or Edge is a discontinued Proprietary Software, proprietary cross-platform software, cross-platform web browser created by Microsoft. Released ...

" and

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

was 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 packages * Cloud-optimized runtime (optimized for the internet) * Host-agnostic via Open Web Interface for .NET (OWIN) support – runs in IIS 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 lightweight 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 In software engineering, dependency injection is a programming technique in which an object or function receives other objects or functions that it requires, as opposed to creating them internally. Dependency injection aims to separate the con ...

* Enhanced Security compared to Asp.Net

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 be ...

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 ...

* Blazor * Kestrel web server

References

External links

*
ASP.NET Core
on

GitHub GitHub () is a Proprietary software, proprietary developer platform that allows developers to create, store, manage, and share their code. It uses Git to provide distributed version control and GitHub itself provides access control, bug trackin ...