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! ๐ŸŽ‰ 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

  • Hands On: New VS Code Insiders Build Creates Web Page from Image in Seconds

    New Vision support with GitHub Copilot in the latest Visual Studio Code Insiders build takes a user-supplied mockup image and creates a web page from it in seconds, handling all the HTML and CSS.

  • Naive Bayes Regression Using C#

    Dr. James McCaffrey from Microsoft Research presents a complete end-to-end demonstration of the naive Bayes regression technique, where the goal is to predict a single numeric value. Compared to other machine learning regression techniques, naive Bayes regression is usually less accurate, but is simple, easy to implement and customize, works on both large and small datasets, is highly interpretable, and doesn't require tuning any hyperparameters.

  • VS Code Copilot Previews New GPT-4o AI Code Completion Model

    The 4o upgrade includes additional training on more than 275,000 high-quality public repositories in over 30 popular programming languages, said Microsoft-owned GitHub, which created the original "AI pair programmer" years ago.

  • Microsoft's Rust Embrace Continues with Azure SDK Beta

    "Rust's strong type system and ownership model help prevent common programming errors such as null pointer dereferencing and buffer overflows, leading to more secure and stable code."

  • Xcode IDE from Microsoft Archrival Apple Gets Copilot AI

    Just after expanding the reach of its Copilot AI coding assistant to the open-source Eclipse IDE, Microsoft showcased how it's going even further, providing details about a preview version for the Xcode IDE from archrival Apple.

Subscribe on YouTube

Upcoming Training Events