C# 12

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•Last updated Aug 8, 2026

New features added for C# 12

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[Version 12.0] Feature support for inline arrays
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#1620 opened Apr 6, 2026 · Updated Oct 14, 2026Draft
4
[Version 12.0] Feature support for using alias types
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#1622 opened Apr 7, 2026 · Updated Oct 14, 2026Draft
[Version 12.0] Feature support for optional and parameter array params
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#1623 opened Apr 8, 2026 · Updated Oct 14, 2026Draft
[Version 12.0] Feature support for ref readonly parameters
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#1624 opened Apr 8, 2026 · Updated Oct 14, 2026Draft
1
[Version 12.0] Feature support for collection expressions
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#1638 opened Apr 16, 2026 · Updated Oct 14, 2026Draft
[Version 12.0] Feature support for primary constructors
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#1766 opened Aug 8, 2026 · Updated Oct 14, 2026Draft

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