C# 10

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•Last updated May 19, 2026

Spec updates for C# 10

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[Version 10.0] Feature support for record structs
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#1556 opened Jan 28, 2026 · Updated Sep 21, 2026Draft
5
[Version 10.0] Feature support for CallerArgumentExpression attribute
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#1535 opened Jan 19, 2026 · Updated Sep 21, 2026Draft
10
[Version 10.0] Feature support for record class as an alias for record
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#1536 opened Jan 20, 2026 · Updated Sep 21, 2026Draft
2
[Version 10.0] Update the Foreword
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#1537 opened Jan 20, 2026 · Updated Sep 21, 2026Draft
2
[Version 10.0] Feature support for file-scoped namespaces
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#1540 opened Jan 22, 2026 · Updated Sep 21, 2026Draft
4
[Version 10.0] Feature support for async method builder attribute
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#1543 opened Jan 23, 2026 · Updated Sep 21, 2026Draft
2
[Version 10.0] Feature support for improved definite assignment
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#1545 opened Jan 23, 2026 · Updated Sep 21, 2026Draft
5
[Version 10.0] Feature support for record with sealed ToString
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#1550 opened Jan 24, 2026 · Updated Sep 21, 2026Draft
5
[Version 10.0] Feature support for extended property patterns
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#1551 opened Jan 24, 2026 · Updated Sep 21, 2026Draft
1
[Version 10.0] Feature support for improved interpolated strings
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#1552 opened Jan 25, 2026 · Updated Sep 21, 2026Draft
4
[Version 10.0] Feature support for parameterless struct constructors
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#1561 opened Jan 30, 2026 · Updated Sep 21, 2026Draft
1
[Version 10.0] Feature support for enhanced #line directives
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#1564 opened Feb 5, 2026 · Updated Sep 21, 2026Draft
2
[Version 10.0] Feature support for global using directives
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#1565 opened Feb 6, 2026 · Updated Sep 21, 2026Draft
1
[Version 10.0] Feature support for lambda improvements
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#1566 opened Feb 8, 2026 · Updated Sep 21, 2026Draft
7
Reorganize how record structs are spec'd
dotnet/csharpstandard#1697 · opened on May 19, 2026 · C# 10

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