.NET 9 Preview 6 is now available!

[.NET Team]

It’s a great time to check out the latest .NET 9 Preview! We just shipped our sixth preview release, adding to some great features in the previous previews with major enhancements across the .NET Runtime, SDK, libraries, C#, and frameworks including ASP.NET Core, Blazor, and .NET MAUI. Check out the full release notes linked below and get started today.

Download .NET 9 Preview 6​

This release contains the following improvements:

Libraries:

• Improvements to System.Numerics
• Support Primary Constructors in Logging Source Generator
• System.Text.Json Improvements
• [GeneratedRegex] on properties
• Regex.EnumerateSplits
• OrderedDictionary<TKey, TValue>
• ReadOnlySet<T>
• allows ref struct used in many places throughout the libraries
• Collection lookups with spans
• More span-based APIs
• Base64Url
• SocketsHttpHandler by default in HttpClientFactory
• TLS resume with client certificates on Linux
• System.Net.ServerSentEvents
• Introducing the Metrics Gauge Instrument
• Full release notes

Runtime:

• ARM64 Code Generation
• Code Layout
• Loop Optimizations
• Reduced Address Exposure
• AVX10v1 Support
• Hardware Intrinsic Code Generation
• Constant Folding for Floating Point and SIMD Operations
• Full release notes

SDK

• NuGetAudit now raises warnings for vulnerabilities in transitive dependencies
• dotnet nuget why
• MSBuild BuildChecks
• Full release notes

You can find detailed release notes for additional features in .NET 9 Preview 6 below:

C#​

• Partial properties
• Full release notes

ASP.NET Core​

• Fingerprinting of static web assets
• Improved distributed tracing for SignalR
• Enhancements to Microsoft.AspNetCore.OpenAPI
• Analyzer to warn when [Authorize] is overridden by [AllowAnymous]
• ComponentPlatform renamed to RendererInfo
• Split large HTTP/2 headers across frames
• Full release notes

.NET MAUI​

• Full release notes

Get started​

To get started with .NET 9, install the .NET 9 SDK.

If you’re on Windows using Visual Studio, we recommend installing the latest Visual Studio 2022 preview, or get started with Visual Studio Code and the C# Dev Kit extension.

Team Announcements & Discussions​

The team has been making monthly announcements alongside full release notes on the dotnet/core GitHub Discussions and has seen great engagement and feedback from the community. We will continue to post each new release on GitHub, but as we get closer to launch this November alongside .NET Conf 2024 (save the date today!), we wanted to cross-post our release details on the .NET blog.

Discuss this release with the product teams on GitHub through the GitHub discussion announcement for this release.

• .NET 9 Preview 6 Discussion
• .NET Libraries & Runtime Discussion
• .NET MAUI Discussion
• ASP.NET Core Discussion

Stay up to date with .NET 9​

You can stay up-to-date with all the features of .NET 9 with:

• What’s new in .NET 9
• What’s new in C# 13
• What’s new in ASP.NET Core
• What’s new in .NET MAUI
• What’s new in EF Core
• Breaking Changes in .NET 9
• .NET 9 Releases

Additionally, be sure to subscribe to the GitHub Discussions RSS news feed for all release announcements.

We want your feedback, so head over to the .NET 9 Preview 6 GitHub Discussion to discuss features and give feedback for this release.

The post .NET 9 Preview 6 is now available! appeared first on .NET Blog.

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