.NET 10 Preview 1

[jamesmontemagno]

Today, we are excited to announce the first preview release of .NET 10! We just shipped our first preview release, adding to some major enhancements across the .NET Runtime, SDK, libraries, C#, ASP.NET Core, Blazor, .NET MAUI, and more. Check out the full release notes linked below and get started today.

Download .NET 10 Preview 1

This release contains the following improvements.

📚Libraries

• Finding Certificates By Thumbprints Other Than SHA-1
• Finding PEM-encoded Data in ASCII/UTF-8
• New Method Overloads in ISOWeek for DateOnly Type
• String Normalization APIs to Work with Span of Characters
• Numeric Ordering for String Comparison
• Adding TimeSpan.FromMilliseconds Overload with a Single Parameter
• ZipArchive performance and memory improvements
• Additional TryAdd and TryGetValue overloads for OrderedDictionary<TKey, TValue>
• More Left-Handed Matrix Transformation Methods
• Full Release Notes

⏱️Runtime

• Array Interface Method Devirtualization
• Stack Allocation of Arrays of Value Types
• AVX10.2 Support
• Full Release Notes

🛠️ SDK

• Pruning of Framework-provided Package References
• Full Release Notes

C#

• nameof in unbound generics
• Implicit span conversions
• field backed properties
• Modifiers on simple lambda parameters
• Experimental feature - String literals in data section
• Full Release Notes

F#

This release you will find updates across the F# language, FSharp.Core standard library, and FSharp.Compiler.Service.

Visual Basic

• unmanaged constraint support
• Honor overload resolution priority
• Full Release Notes

🌐 ASP.NET Core & Blazor

• OpenAPI 3.1 support
• Generate OpenAPI documents in YAML format
• Response description on ProducesResponseType
• Detect if URL is local using RedirectHttpResult.IsLocalUrl
• Improvements to integration testing of apps with top-level statements
• QuickGrid RowClass parameter
• Blazor script as a static web asset
• Route syntax highlighting for Blazor RouteAttribute
• Full Release Notes

📱 .NET MAUI

This release focused on quality improvements for .NET MAUI. In addition to the CollectionView enhancements for iOS and Mac Catalyst are included in this release, browse through the full GitHub release notes for all of the improvements.

.NET for Android

• Android 16 (Baklava) Beta 1
• Minimum supported Android API recommendations
• Building with JDK-21 is now supported
• dotnet run support for Androd projects
• Enable marshal methods by default
• Visual Studio Design-Time Builds no longer invoke aapt2

.NET for iOS, Mac Catalyst, macOS, tvOS

• Trimmer warnings enabled by default
• Bundling original resources in libraries

Browse the full release notes for all of this and more.

🖥️ Windows Forms

• Clipboard related serialization and deserialization changes
• Obsoleted Clipboard APIs
• New Clipboard related APIs
• Full Release Notes

🖥️ Windows Presentation Foundation (WPF)

This release focused on quality improvements. A full list of changes can be found in the release notes.

🎁 Entity Framework Core

• Support for the .NET 10 LeftJoin operator
• ExecuteUpdateAsync now accepts a regular, non-expression lambda
• Full Release Notes

📦 Container Images

• 10.0-preview tags use Ubuntu 24.04
• Debian images use Debian 13 "Trixie"
• Ubuntu Chiseled images now contain the Chisel manifest
• Full Release Notes

🚀 Get started

To get started with .NET 10, install the .NET 10 SDK.

If you're on Windows using Visual Studio, we recommend installing the latest Visual Studio 2022 preview. You can also use Visual Studio Code and the C# Dev Kit extension with .NET 10.

🔔 Stay up-to-date with .NET 10

You can stay up-to-date with all the features of .NET 10 with:

• What's new in .NET 10
• What's new in C# 14
• What's new in .NET MAUI
• What's new in ASP.NET Core
• What's new in Entity Framework Core
• What's new in Windows Forms
• What's new in WPF
• Breaking Changes in .NET 10
• .NET 10 Releases

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

[goodluckily]

good

[AB01GIT]

looks good

[LeftTwixWand]

Wonderful 2025:

• Win Forms is still alive and getting updates
• WinUI 3 feels like dead (ping me when it gets the Designer)

[sean-bloch]

Any chance of a longer LTS cycle for 10?

[mairaw]

The support policy is still the same for STS and LTS releases

https://dotnet.microsoft.com/en-us/platform/support/policy/dotnet-core#cadence

[UweKeim]

I'm waiting since over a decade for "Extension everything".

I'm hoping sooooooooooo much that this feature will finally be included this time 🥹.

[jaynauwimgud]

waitingggg