.NET 9 Preview 5

[jamesmontemagno]

We are pleased to announce the release of .NET 9 Preview 5.

This release contains the following Libraries improvements:

• Enhanced AI capabilities with TensorPrimitives and Tensor<T>
• params offers better performance with Span overloads
• SearchValues can search for (multiple) substrings within a string
• foreach completed tasks with Task.WhenEach
• Prioritized unbounded channel
• OpenTelemetry activity linking is more flexible
• TypeDescriptor trimming support
• Type name parsing

For details on these new features and more see the Libraries Release Notes

You can find detailed release notes for additional features in .NET 9 Preview 5 below:

.NET Data & EF Core

• Enhanced database provider for Azure Cosmos DB for NoSQL
• Query translation improvements
• Full release notes

.NET MAUI

• Updated Blazor Hybrid Templates
• Android API 35 Beta 2 Support
• Android - LLVM Marshalled Methods
• Android - Trimming Enhancements
• Full release notes

ASP.NET Core

• Optimized static web asset delivery
• Improved Blazor Server reconnection experience
• Detect the current component render mode at runtime
• Simplified authentication state serialization for Blazor Web Apps
• New .NET MAUI Blazor Hybrid and Web solution template
• 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.

You can find .NET 9 Preview 5 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
• 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

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

Stay up to date by subscribing to the RSS feed for all release announcements.

Engage with the product teams by commenting below as you try out these new features or have questions.