.NET 9 Release Candidate 1 is now available. This is our first of two release candidates which come with a go-live support license so you can confidently use this release for your production applications. This release includes enhanced WebSocket APIs, new compression options, advanced SignalR tracing, and updates to .NET MAUI for better text alignment, and more. Check out the full release notes linked below and get started today.

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 can now 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.

📢 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.

• .NET MAUI
• ASP.NET Core
• Libraries & Runtime

🔔 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

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 Release Candidate 1 GitHub Discussion to discuss features and give feedback for this release.