What’s new in ASP.NET Core 6.0

Today we are going to discuss new features and improvements of ASP.NET Core 6.0. ASP.NET Core 6.0 is the latest version of ASP.NET Core and it’s released on 8-Nov 2021. Let’s discuss What’s new in ASP.NET Core 6.0 and its advantages.

What is ASP.NET Core?

ASP.NET Core is the rewritten version of ASP.NET and it’s a cross-platform and open-source framework to develop high-performance web applications. It was developed by Microsoft and can run on Windows, Linux, and Mac OS.

ASP.NET Core MVC and Razor improvments:

Minimal APIs:

Architected to create HTTP APIs with minimal dependencies. Minimal APIs are ideally used in microservices and apps where minimum features, files, and dependencies are required in ASP.NET Core.


Long-running activity tag of SignalR Connections. It is used by Application performance management (APM) services like Azure Monitor Application Insights to strain SignalR requests from creating long-running request alerts.

Signal Performance Improvement:

Instead of every method hub call, it allocates HubCallerClients.

Instead of per stream item in server-to-client streaming, It allocates a single StreamItemMessage per stream.

Razor Compiler:

In ASP.NET Core 6.0 Razor compiler is based on C# source generator and It really helps to speed up application build time by simplifying the razor compiler.

The previous razor compiler produces a separate View assembly. The updated razor compiler builds pages and views into the main project assembly.

ASP.NET Core Performance

  • Reduced memory allocation when accessing the HttpRequest.Cookies
  • Per connection, overhead is reduced in SocketConnection by ~30%.
  • By removing logging delegates in generic types allocations are reduced
  • 50% Faster GET access to commonly used features.
  • Reuse HttpProtocol CancellationTokenSource in kestrel.
  • Memory footprint is reduced for idle TLS connections.
  • Size of System.IO.Pipelines.Pipe is reduced.
  • IAsyncDisposable is now supported and is available for controllers, pages, models, and views components.
  • Hot Reload is now available. Now Razor pages and CSS files can be changed into a running project without rebuilding or restarting the project.
  • Bootstrap 5.1 is supported by ASP.NET Core 6.0.
  • In All ASP.NET Core 6.0 templates C# null-state analysis is by default enabled.
  • Automatically added developer exception page middleware.
  • Ahead-of-time (AOT) compilation is supported by Blazor web assembly where .NET code can be directly compiled into the web assembly.
  • Support for Angular and React. Frontend Javascript other frameworks also can be used based on a flexible template pattern.
  • HTTP headers can be accessed in a strongly typed way.

Blazor Improvements:

  • Persisting state in a prerendered page is supported by Blazor so that when the app is fully loaded state doesn’t need to be recreated.
  • Dynamically render Razor components from JavaScript for existing JavaScript Apps.
  • For handling exceptions on the UI level error boundaries provide a convenient approach.
  • Optimized byte array JS interop is supported that avoids encoding and decoding byte arrays into Base64.
  • Support for Query strings is improved.
  • Components are rendered from JavaScript.
  • custom event arguments are supported which enable us to pass arbitrary data to .NET event hansdlers with custom events.
  • JavaScript Initializers are supported.

If you have any queries or suggestions about this post do not hesitate to contact us or comment below.

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