.NET 9 Preview 5

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`](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#enhanced-ai-capabilities-with-tensorprimitives-and-tensort)
- [`params` offers better performance with `Span` overloads](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#params-offers-better-performance-with-span-overloads)
- [`SearchValues` can search for (multiple) substrings within a string](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#searchvalues-can-search-for-multiple-substrings-within-a-string)
- [`foreach` completed tasks with `Task.WhenEach`](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#foreach-completed-tasks-with-taskwheneach)
- [Prioritized unbounded channel](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#prioritized-unbounded-channel)
- [OpenTelemetry activity linking is more flexible](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#opentelemetry-activity-linking-is-more-flexible)
- [TypeDescriptor trimming support](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#typedescriptor-trimming-support)
- [Type name parsing](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md#type-name-parsing)

For details on these new features and more see the [Libraries Release Notes](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/libraries.md)

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](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/efcoreanddata.md#enhanced-database-provider-for-azure-cosmos-db-for-nosql)
- [Query translation improvements](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/efcoreanddata.md#query-translation-improvements)
- Full [release notes](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/efcoreanddata.md)

## .NET MAUI
- [Updated Blazor Hybrid Templates](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/dotnetmaui.md#blazor-hybrid-updated-templates)
- [Android API 35 Beta 2 Support](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/dotnetmaui.md#android-api-35-beta-2)
- [Android - LLVM Marshalled Methods](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/dotnetmaui.md#llvm-marshalled-methods)
- [Android - Trimming Enhancements](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/dotnetmaui.md#trimming-enhancements)
- Full [release notes](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/dotnetmaui.md)

## ASP.NET Core
- [Optimized static web asset delivery](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/aspnetcore.md#optimized-static-web-asset-delivery)
- [Improved Blazor Server reconnection experience](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/aspnetcore.md#improved-blazor-server-reconnection-experience)
- [Detect the current component render mode at runtime](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/aspnetcore.md#detect-the-current-component-render-mode-at-runtime)
- [Simplified authentication state serialization for Blazor Web Apps](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/aspnetcore.md#simplified-authentication-state-serialization-for-blazor-web-apps)
- [New .NET MAUI Blazor Hybrid and Web solution template](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/aspnetcore.md#new-net-maui-blazor-hybrid-and-web-solution-template)
- Full [release notes](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/aspnetcore.md)

## Get started
To get started with .NET 9, [install the .NET 9 SDK](https://dotnet.microsoft.com/download/dotnet/9.0).

If you're on Windows using Visual Studio, we recommend installing the latest [Visual Studio 2022 preview](https://visualstudio.microsoft.com/vs/preview/), or get started with Visual Studio Code and the [C# Dev Kit](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csdevkit) extension.

You can find [.NET 9 Preview 5 Installer & Binaries](https://github.com/dotnet/core/blob/main/release-notes/9.0/preview/preview5/9.0.0-preview.5.md) on GitHub.

## Team Announcements & Discussions
Discuss this release with the product teams on GitHub through the announcements for this release.

* [.NET MAUI](https://github.com/dotnet/maui/discussions/22977)
* [ASP.NET Core](https://github.com/dotnet/aspnetcore/discussions/56194)
* [Libraries & Runtime](https://github.com/dotnet/runtime/discussions/103313)

## 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](https://learn.microsoft.com/dotnet/core/whats-new/dotnet-9/overview)
* [What's new in ASP.NET Core](https://learn.microsoft.com/aspnet/core/release-notes/aspnetcore-9.0)
* [What's new in .NET MAUI](https://learn.microsoft.com/dotnet/maui/whats-new/dotnet-9)
* [What's new in EF Core](https://learn.microsoft.com/ef/core/what-is-new/ef-core-9.0/whatsnew)
* [Breaking Changes in .NET 9](https://learn.microsoft.com/dotnet/core/compatibility/9.0)
* [.NET 9 Releases](https://github.com/dotnet/core/blob/main/release-notes/9.0/README.md)

For .NET 9 previews we are utilizing GitHub Discussions to make announcements. For more information [read our discussion](https://github.com/dotnet/core/discussions/9131).

Stay up to date by subscribing to the [RSS feed](https://github.com/dotnet/core/discussions/categories/news.atom) for all release announcements.

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