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Operating systemLinux, macOS, Windows
Included withASP.NET Core
TypeWeb framework
LicenseApache License 2.0

Blazor is a free and open-source web framework that enables developers to create web apps using C# and HTML.[1][2][3][4][3][5][6][7] It is being developed by Microsoft. Five different editions of Blazor apps have been announced.

  • Blazor Server: These apps are hosted on an ASP.NET Core server in ASP.NET Razor format. Remote clients act as a thin clients, meaning that the bulk of the processing load is on the server. The client's web browser downloads a small page and updates its UI over a SignalR connection. Blazor Server was released as a part of .NET Core 3.[8]
  • Blazor WebAssembly: Single-page apps that are downloaded to the client's web browser before running. The size of the download is larger than for Blazor Server, depends on the app, and the processing is entirely done on the client hardware. However, this app type enjoys rapid response time. As its name suggests, this client-side framework is written in WebAssembly, as opposed to JavaScript. A beta version of this framework has been made available, but its general availability is scheduled for May 2020.[8]

Microsoft plans to release Blazor PWA and Blazor Hybrid editions. The former supports progressive web apps (PWA). The latter is a platform-native framework (as opposed to a web framework) but still renders the user interface using web technologies (e.g. HTML and CSS). A third Blazor Native – platform-native framework that renders a platform-native user interface – has also been considered but has not reached the planning stage.[8]

See also[edit]

  • asm.js - precursor technology of WebAssembly allowing applications written in C or C++ to run in client-side web applications.
  • Google Native Client - now deprecated Google's precursor technology of WebAssembly that allows running native code from a web browser, independent of browser's operating system


  1. ^ Strahl, Rick (July 31, 2018). "Web Assembly and Blazor: Re-assembling the Web". Archived from the original on 2018-10-22. Retrieved 2018-10-22.
  2. ^ Tomassetti, Federico (September 4, 2018). "Blazor: .NET in the Browser". Archived from the original on 2018-10-22. Retrieved 2018-10-22.
  3. ^ a b Stropek, Rainer (September 2018). "Learn Blazor". Archived from the original on 2018-10-22. Retrieved 2018-10-22.
  4. ^ James, Mike (February 12, 2018). "Blazor .NET In The Browser". Retrieved 2018-10-23.
  5. ^ "Web Development - C# in the Browser with Blazor". MSDN Magazine. September 2018. Archived from the original on 2018-10-22. Retrieved 2018-10-22.
  6. ^ "Get started building .NET web apps that run in the browser with Blazor". ASP.NET Blog. March 22, 2018. Retrieved 2018-10-22.
  7. ^ Ball, Kevin (June 26, 2018). "How WebAssembly is Accelerating the Future of Web Development". Archived from the original on 2018-10-22. Retrieved 2018-10-22.
  8. ^ a b c Roth, Daniel (10 October 2019). "Blazor Server in .NET Core 3.0 scenarios and performance". ASP.NET Blog. Microsoft.

External links[edit]