.NET 9 RC 1

[rbhanda]

Announcement

We are pleased to announce the release of .NET 9 Release Candidate 1.

This release contains the following improvements:

📚Libraries

• WebSocket Keep-Alive Ping and Timeout APIs

• Add ZLib, Brotli compression options

• Add TarEntry.DataOffset

• HttpClientFactory no longer logs header values by default

• Out-of-proc Meter wildcard listening

• Full release notes

🛠️ SDK

• Workload History

• Full release notes

🌐 ASP.NET Core

• Improvements to SignalR distributed tracing

• Keep-alive timeout for WebSockets

• Keyed DI in middleware

• Override InputNumber type attribute

• Trust the ASP.NET Core HTTPS development certificate on Linux

• Full release notes

📱 .NET MAUI

• Added HorizontalTextAlignment.Justify

• 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. .NET 9 is now can be installed directly through the Visual Studio installer starting with Visual Studio 2022 17.12 Preview 2.

You can also use Visual Studio Code and the C# Dev Kit extension with .NET 9.

You can find .NET 9 RC 1 Installer & Binaries on GitHub.

Team Announcements & Discussions

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

• .NET MAUI
• ASP.NET Core(ASP.NET Core updates in .NET 9 Release Candidate 1 aspnetcore#57787)

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 ASP.NET Core
• What's new in .NET MAUI
• What's new in EF Core
• Breaking Changes in .NET 9
• .NET 9 Releases

For .NET 9 previews we are utilizing GitHub Discussions to make announcements. For more information read our discussion.

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