What’s new in ASP.NET Core 6.0

whats new in aspnet core 6

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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