News

.NET 9 Preview 3: 'I've Been Waiting 9 Years for This API!'

Microsoft's third preview of .NET 9 sees a lot of minor tweaks and fixes with no earth-shaking new functionality, but little things can be important to individual developers.

For example, who would have figured that adding the PersistableAssemblyBuilder type in System.Reflection.Emit was a big deal?

"Finally! 🎉 I've been waiting 9 years for this API! I'll try and get this working, and report back with feedback," commented a developer about that addition in a GitHub discussion announcing .NET 9 Preview 3.

More about that API -- under the .NET Libraries section -- can be found in the release notes.

Microsoft's James Montemagno summarized what's new in Libraries, Runtime and the SDK last week, with other highlights including:

Other highlights for different .NET 9 components include:

  • Entity Framework Core 9:
    • Auto-compiled models
    • Sugar for HierarchyId path generation
  • .NET MAUI:
    • Multi-target versions of .NET for iOS bindings
    • Android Asset Packs
  • ASP.NET Core:
    • Endpoint metadata on the developer exception page
    • Added InternalServerError and InternalServerError<TValue> to TypedResults
    • Handle keyboard composition events in Blazor
.NET Schedule
[Click on image for larger view.] .NET Schedule (source: Microsoft).

.NET 9, coming in November, has a special focus on cloud-native apps and performance, Microsoft said. As a standard-term support (STS) release, it will be supported for 18 months.

Complete information is summarized in the What's new in .NET 9 documentation, which was updated April 11.

About the Author

David Ramel is an editor and writer at Converge 360.

comments powered by Disqus

Featured

  • Compare New GitHub Copilot Free Plan for Visual Studio/VS Code to Paid Plans

    The free plan restricts the number of completions, chat requests and access to AI models, being suitable for occasional users and small projects.

  • Diving Deep into .NET MAUI

    Ever since someone figured out that fiddling bits results in source code, developers have sought one codebase for all types of apps on all platforms, with Microsoft's latest attempt to further that effort being .NET MAUI.

  • Copilot AI Boosts Abound in New VS Code v1.96

    Microsoft improved on its new "Copilot Edit" functionality in the latest release of Visual Studio Code, v1.96, its open-source based code editor that has become the most popular in the world according to many surveys.

  • AdaBoost Regression Using C#

    Dr. James McCaffrey from Microsoft Research presents a complete end-to-end demonstration of the AdaBoost.R2 algorithm for regression problems (where the goal is to predict a single numeric value). The implementation follows the original source research paper closely, so you can use it as a guide for customization for specific scenarios.

  • Versioning and Documenting ASP.NET Core Services

    Building an API with ASP.NET Core is only half the job. If your API is going to live more than one release cycle, you're going to need to version it. If you have other people building clients for it, you're going to need to document it.

Most   Popular

Subscribe on YouTube