.NET 10 Preview 3

[jamesmontemagno]

Today, we are excited to announce the third preview release of .NET 10 with 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 3

This release contains the following improvements.

📚Libraries

• Introduce an AOT-Safe Constructor for ValidationContext
• Support for Telemetry Schema URLs in ActivitySource and Meter
• Byte-Level Support in BPE Tokenizer
• Deterministic option for LightGBM Trainer in ML.NET
• Tensor enhancements
• Full Release Notes

⏱️Runtime

• Stack Allocation of Small Arrays of Reference Types
• Improved Code Layout
• Full Release Notes

🛠️ SDK

• The --interactive option is now...interactive!
• Native Shell Tab-Completion scripts
• Console apps can natively create container images
• Explicitly control the image format of containers
• Support for Microsoft Testing Platform in dotnet test
• Full Release Notes

C#

• Extension members
• Null-conditional assignment
• Full Release Notes

F#

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

Visual Basic

• No new features added in this preview release.
• Full Release Notes

🌐 ASP.NET Core & Blazor

• Declarative model for persisting state from components and services
• Reference fingerprinted static web assets in standalone Blazor WebAssembly apps
• HttpClient response streaming enabled by default on WebAssembly
• DisableMatchAllIgnoresLeftUriPart app context switch renamed to EnableMatchAllForQueryStringAndFragment
• Set the environment at build-time for standalone Blazor WebAssembly apps
• Validation support in minimal APIs
• OpenAPI support enabled by default in the ASP.NET Core Web API (native AOT) template
• Support for Server-Sent Events (SSE)
• Full Release Notes

📱 .NET MAUI

• Fullscreen video playback
• Geolocation IsEnabled
• WebAuthenticator CancellationToken
• Performance improvements
• Full Release Notes

.NET for Android

This release was focused on quality improvements, build performance, and experimental runtimes. A detailed list can be found on dotnet/android GitHub releases.

.NET for iOS, Mac Catalyst, macOS, tvOS

This release includes support for Xcode 16.3 Release Candidate, and is focused on quality improvements. A detailed list can be found on dotnet/macios GitHub releases including a list of Known issues.

🖥️ Windows Forms

This release is focused on several quality and engineering improvements. See the full release notes for details.

🖥️ Windows Presentation Foundation (WPF)

This release includes Fluent style changes along side several performance & quality improvements. See the full release notes for details.

🎁 Entity Framework Core

• Improved experience when evolving the model on Azure Cosmos DB for NoSQL
• Small improvements to redact inlined constants from logs and to LoadExtension
• Full Release Notes

📦 Container Images

• No new features added in this preview release.
• 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.

📦 Join us for .NET 10 Preview 3 Unboxed Live Stream

Join us for an unboxing live stream with the team to discuss what's new in this preview release, with live demos from the dev team!

📢 .NET 10 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.

🔔 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.

[Mylab6]

Will this offer any improvements to the C# to Web Assembly pipeline ? Godot needs a bit of assistance getting C# to work in Web builds, anyway for the foundation to assist ?

[HarrisonWD]

I'm guessing this isn't compatible with Blazor Web App - InteractiveAuto (global). As when I create the project it's missing all the InteractiveWebAssembly references

[ClementeGao]

great!