.NET docs: What's new for December 2024

Welcome to what's new in the .NET docs for December 2024. This article lists some of the major changes to docs during this period.

.NET breaking changes

New articles

• .NET Monitor images simplified to version-only tags
• C# overload resolution prefers params span-type overloads
• Legacy Mono and Emscripten JavaScript APIs not exported to global namespace
• New version of some OOB packages
• Nullable JsonDocument properties deserialize to JsonValueKind.Null
• System.Windows.Forms.StatusStrip uses a different default renderer

.NET fundamentals

New articles

• .NET debugger extensions
• .NET debugger extensions installer (dotnet-debugger-extensions)
• Artificial intelligence in .NET (Preview)
• Built-in activities in .NET
• IL2123: RequiresUnreferencedCodeAttribute cannot be placed directly on application entry point
• IL3005: RequiresAssemblyFilesAttribute cannot be placed directly on application entry point
• IL3057: RequiresDynamicCodeAttribute cannot be placed directly on application entry point
• The TestContext class
• What is TimeProvider?

Updated articles

• Configure MSTest - MSTest: document testconfig.json
• How to stream XML fragments from an XmlReader (LINQ to XML) - Fixed incorrect logic in XmlReader's example (#43799)
• Supported types in System.Text.Json - Add supported types for STJ article

C# language

New articles

• Deconstruction expression - Extract properties of fields from a tuple or other user-defined type
• Discard - A _ acts as a placeholder for a variable

F# language

Updated articles

• Attributes (F#) - F# 9 doc updates

AI in .NET

Updated articles

• Build a .NET AI vector search app - New vector search quickstart

ML.NET

Updated articles

• Machine learning tasks in ML.NET - Add text classification and sentence similarity to ML tasks

.NET Framework

New articles

• Install .NET Framework on Windows Server 2025
• November 2024 cumulative update preview

Community contributors

The following people contributed to the .NET docs during this period. Thank you! Learn how to contribute by following the links under "Get involved" in the what's new landing page.

• BartoszKlonowski - Bartosz Klonowski
• DaRosenberg - Daniel Rosenberg
• DonCorleone - Linus Wieland
• inwenis - fku-incom
• jkone27 - gparmigiani
• Nothing-Works - Andy
• oksanatk - Oksana Tkach
• Rageking8 -
• RaphaelSantiago53 - Raphael
• stamminator - Jacob Stamm
• timdeschryver - Tim Deschryver
• tmds - Tom Deseyn