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Razor file formats
Filename extension	.razor, .cshtml, .vbhtml
Internet media type	text/html
Developed by	Microsoft

Razor
Original author(s)	Microsoft
Developer(s)	.NET Foundation
Initial release	June 2010; 14 years ago
Stable release	3.2.7 / November 29, 2018; 6 years ago
Preview release	4.0.0-rc1 / November 18, 2015; 9 years ago
Repository	github.com/aspnet/Razor; github.com/aspnet/AspNetWebStack; github.com/dotnet/aspnetcore
Written in	C#, VB.NET, HTML
Operating system	Microsoft Windows
Type	Web application framework
License	Apache License 2.0
Website	www.asp.net/web-pages

Razor is an ASP.NET programming syntax used to create dynamic web pages with the C# or VB.NET programming languages. Razor was in development in June 2010^[4] and was released for Microsoft Visual Studio 2010 in January 2011.^[5] Razor is a simple-syntax view engine and was released as part of MVC 3 and the WebMatrix tool set.^[5]

Razor became a component of AspNetWebStack and then became a part of ASP.NET Core.^[6]

Design

The Razor syntax is a template markup syntax, based on the C# programming language, that enables the programmer to use an HTML construction workflow.^{[clarification needed]} Instead of using the ASP.NET Web Forms (.aspx) markup syntax with <%= %> symbols to indicate code blocks, Razor syntax starts code blocks with an @ character and does not require explicit closing of the code-block.

The idea behind Razor is to provide an optimized syntax for HTML generation using a code-focused templating approach, with minimal transition between HTML and code.^[7] The design reduces the number of characters and keystrokes, and enables a more fluid coding workflow by not requiring explicitly denoted server blocks within the HTML code.^[4] Other advantages that have been noted:^[8]

Supports IntelliSense – statement completion support
Supports "layouts" – an alternative to the "master page" concept in classic Web Forms (.aspx)
Unit testable