C# 9.0

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•Last updated Oct 7, 2026

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[Version 9.0] Feature support for pattern-matching enhancements
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#1460 opened Nov 10, 2025 · Updated Oct 14, 2026Draft
3
Null conditional spec seems to no longer disallow obj?.MethodGroup
dotnet/csharpstandard#654 · opened on Oct 27, 2022 · C# 9.0
17
§8.8: Is IntPtr as an unmanaged type an extension?
dotnet/csharpstandard#890 · opened on Aug 15, 2023 · C# 9.0
5
Ambiguities in grammar ambiguities
dotnet/csharpstandard#935 · opened on Sep 15, 2023 · C# 9.0
4
C# 7.3 ArrayTypeMismatchException in ref initialization/assignment
dotnet/csharpstandard#838 · opened on Jul 8, 2023 · C# 9.0
8
Foreach processing for types implementing IEnumerable<T> is problematic
dotnet/csharpstandard#1188 · opened on Oct 16, 2024 · C# 9.0
13
Review ordering of top-level clauses
Task
dotnet/csharpstandard#1399 · opened on Sep 3, 2025 · C# 9.0
[Version 9.0] Feature support for init accessors
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#1452 opened Nov 6, 2025 · Updated Oct 14, 2026Draft
33
[Version 9.0] Feature support for record classes
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#1458 opened Nov 7, 2025 · Updated Oct 14, 2026Draft
26
[Version 9.0] Feature support for native sized integers (nint, and nuint)
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#1457 opened Nov 7, 2025 · Updated Oct 22, 2026Draft
73
[Version 9.0] Feature support for covariant return types
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#1462 opened Nov 11, 2025 · Updated Oct 14, 2026Draft
18
[Version 9.0] Feature support for target-typed conditional expression
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#1465 opened Nov 11, 2025 · Updated Oct 14, 2026Draft
10
[Version 9.0] Feature support for Static anonymous functions
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#1461 opened Nov 11, 2025 · Updated Oct 22, 2026
10
[Version 9.0] Feature support for lambda discards
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#1464 opened Nov 11, 2025 · Updated Oct 22, 2026
11
[Version 9.0] Feature support for module initializers
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#1467 opened Nov 11, 2025 · Updated Oct 14, 2026Draft
21
[Version 9.0] Feature support for unconstrained type parameter annotations
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#1470 opened Nov 11, 2025 · Updated Oct 14, 2026Draft
36
[Version 9.0] Feature support for variance safety for static interface members
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#1471 opened Nov 11, 2025 · Updated Oct 14, 2026Draft
[Version 9.0] Feature support for target typed new
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#1469 opened Nov 11, 2025 · Updated Oct 14, 2026Draft
11
[Version 9.0] Feature support for more partial methods
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#1468 opened Nov 11, 2025 · Updated Oct 22, 2026
27
[Version 9.0] Feature support for function pointers
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#1459 opened Nov 10, 2025 · Updated Oct 14, 2026Draft
53
[Version 9.0] Feature support for extension GetEnumerator in foreach
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#1472 opened Nov 14, 2025 · Updated Oct 14, 2026Draft
Normative use of a .NET constant not required by this C# spec
dotnet/csharpstandard#1479 · opened on Nov 24, 2025 · C# 9.0
2
Lack of clarity between compile-time and runtime processing of user-defined conversions
dotnet/csharpstandard#1541 · opened on Jan 23, 2026 · C# 9.0
Incorrect/unclear description of explicit conversions involving user-defined conversions
dotnet/csharpstandard#1542 · opened on Jan 23, 2026 · C# 9.0
Check semantics of nested contexts in patterns in v9
dotnet/csharpstandard#1648 · opened on May 5, 2026 · C# 9.0

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C# 9.0

[Version 9.0] Feature support for pattern-matching enhancements

Null conditional spec seems to no longer disallow `obj?.MethodGroup`

§8.8: Is IntPtr as an unmanaged type an extension?

Ambiguities in grammar ambiguities

C# 7.3 ArrayTypeMismatchException in ref initialization/assignment

Foreach processing for types implementing IEnumerable<T> is problematic

Review ordering of top-level clauses

[Version 9.0] Feature support for `init` accessors

[Version 9.0] Feature support for record classes

[Version 9.0] Feature support for native sized integers (`nint`, and `nuint`)

[Version 9.0] Feature support for covariant return types

[Version 9.0] Feature support for target-typed conditional expression

[Version 9.0] Feature support for Static anonymous functions

[Version 9.0] Feature support for lambda discards

[Version 9.0] Feature support for module initializers

[Version 9.0] Feature support for unconstrained type parameter annotations

[Version 9.0] Feature support for variance safety for static interface members

[Version 9.0] Feature support for target typed `new`

[Version 9.0] Feature support for more partial methods

[Version 9.0] Feature support for function pointers

[Version 9.0] Feature support for extension GetEnumerator in foreach

Normative use of a .NET constant not required by this C# spec

Lack of clarity between compile-time and runtime processing of user-defined conversions

Incorrect/unclear description of explicit conversions involving user-defined conversions

Check semantics of nested contexts in patterns in v9

Issues