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Today we released .NET 7 Preview 5. This preview of .NET 7 includes improvements to Generic Math which make the lives of API authors easier, a new Text Classification API for ML.NET that adds state-of-the-art deep learning techniques for natural language processing, various improvements to source code generators and a new Roslyn analyzer and fixer for RegexGenerator and multiple performance improvements in the areas of CodeGen, Observability, JSON serialization / deserialization and working with streams. 

In this article, we’ll take a close look at some of the changes we made on this very site — running on JAMStack with React — to optimize the web performance and improve the Core Web Vitals metrics. With some of the mistakes we’ve made, and some of the unexpected changes that helped boost all the metrics across the board. 

Say hello to Rider “.NET Core edition”! The backend now can be run on the .NET Core runtime instead of Mono on macOS and Linux! Enable it in "Help | Switch IDE runtime to .NET Core". Enjoy the performance boost and a lower memory footprint!  

What’s new?

The following new features are available for preview in this release:

• URL Rewriting middleware
• Response caching middleware
• Response compression middleware
• WebListener server
• View Components as Tag Helpers
• Middleware as MVC filters
• Cookie-based TempData provider
• View compilation
• Azure App Service logging provider
• Azure Key Vault configuration provider
• Redis and Azure Storage Data Protection Key Repositories 

GitHub License Checker

Adding a permissive license to your open source projects makes it easy for others to benefit from reusing your code. I typically recommend the MIT license for most projects because it’s simple, well understood, and allows the code to be used for essentially any purpose.

ImageSharp, ImageSharp.Drawing, and ImageSharp.Web will all be dual licensed under a AGPLv3/Commercial license. The AGPLv3 license will come with exceptions which allow bundling the code alongside all well known open source licenses (Apache 2.0, MIT etc). Any projects seen as direct competition (Imaging SDKs) will not be able to utilize that exception. 

OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, Go, Java, Node.js, TypeScript, Python, Ruby and PHP. 

AutoRest is an open source tool that generates client libraries for accessing RESTful web services. 

Video Tutorial : https://azure.microsoft.com/en-us/resources/videos/inside-autorest-with-david-justice/ 

ReactOS is an open source alternative to the Windows operation system. Even if the first version of ReactOS dates back to 1998, there is still no 'stable' version of ReactOS. May be, the most important reason is a lack of attention

With Microsoft embracing open source and cross-platform compatibility (not least because it helps to get more people using Azure ) you can be pretty confident that Core is here to stay. It’s likely that the question isn’t “ should you learn Core?” but rather “ when should you start learning Core?”.