This release contains the following improvements.

📚Libraries

• Add Out-of-Proc Trace Support for Activity Events and Links
• Rate Limiting Trace Sampling Support
• New async Zip APIs
• Performance improvement in GZipStream for concatenated streams
• Full Release Notes

⏱️Runtime

• Escape Analysis for Local Struct Fields
• Inlining Improvements
• Full Release Notes

🛠️ SDK

• No new features added in this preview release.

C#

• No new features added in this preview release.

F#

This release you will find updates across theF# language,FSharp.Core standard library, andFSharp.Compiler.Service.

Visual Basic

• No new features added in this preview release.

🌐 ASP.NET Core & Blazor

• JSON Patch with System.Text.Json
• Minimal API validation for record types
• Generate OpenAPI schemas in transformers
• Improved OpenAPI XML documentation support
• Access the OpenAPI document withIOpenApiDocumentProvider
• OpenAPI.NET updated to Preview.17
• JavaScript interop for constructors and properties
• Reference a JavaScript function withIJSObjectReference
• Blazor WebAssembly runtime diagnostics
• Signal Not Found responses usingNavigationManager
• NavigationManager.NavigateTo no longer throws aNavigationException
• QuickGrid methodCloseColumnOptionsAsync renamed toHideColumnOptionsAsync
• WriteImportMapToHtml renamed toOverrideHtmlAssetPlaceholders
• Preload Blazor framework static assets
• Blazor WebAssembly Standalone App template updates
• Blazor boot manifest merged into dotnet.js
• UseWebApplicationFactory with Kestrel for integration testing
• Full Release Notes

📱 .NET MAUI

• MediaPicker modernization
• Nullable Pickers
• Full Release Notes
• Full list of quality improvements ondotnet/maui GitHub releases.

🤖 .NET for Android

• Use System.IO.Compression for.apk creation
• Reduced download size
• Full list of quality improvements ondotnet/android GitHub releases.

🍎 .NET for iOS, Mac Catalyst, macOS, tvOS

This release was focused on quality improvements and build performance. A detailed list can be found ondotnet/macios GitHub releases including a list ofKnown issues.

🖥️ Windows Forms

This release introducedshared core clipboard functionality with WPF and was focused on several quality and engineering improvements. See thefull release notes for details.

🖥️ Windows Presentation Foundation (WPF)

• API Enhancements
• Shared Clipboard Code
• Fluent Theme Bug Fixes and Enhancements
• Performance Improvements
• Full Release Notes for details.

🎁 Entity Framework Core

• Full-text search support on Azure Cosmos DB for NoSQL
• Hybrid search
• Vector similarity search exits preview
• Several small improvements
• Full Release Notes

📦 Container Images

• No new features added in this preview release.

🚀 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 latestVisual Studio 2022 preview, which now includesGitHub Copilot agent mode and MCP server support. You can also use Visual Studio Code and theC# Dev Kit extension with .NET 10.

📦 Join us for .NET 10 Preview 4 Unboxed Live Stream

Join us for a live stream unboxing 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 makingmonthly announcements alongside fullrelease notes on thedotnet/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 DiscussionsRSS news feed for all release announcements.

We want your feedback, so head over to the.NET 10 Preview 4 GitHub Discussion to discuss features and give feedback for this release.