What’s new in C# 13
summary
C# 13 delivers concrete language changes: auto-properties gain accessor bodies with a new field contextual name for the generated backing field (compiler offers a fixer that adds @ to avoid breakage), collection expressions extend to dictionaries and choose params of ReadOnlySpan overloads for allocation-free construction, and a new extension types feature lets methods, properties and indexers appear on existing types (demo with System.Text.Json worked but some bits remain experimental and performance-unoptimized). Preview compiler bits and docs are available; some APIs land later in .NET 9.
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chapters (6)
- 0:00Introduction to C# 13
- 5:47Params collection support
- 10:39Field access in properties
- 17:42Extension types
- 36:26Generic extension aliases
- 39:32Q&A and closing
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