dotnet/csharpstandard

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Working space for ECMA-TC49-TG2, the C# standard committee.

Stars: 815
Forks: 99
Open beginner issues: 3
Indexed issues: 249
Avg merge: 1d 14h
Merged PRs (30d): 16

Dominant language: C#
License: CC-BY-4.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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249 open issues indexed

Nigel to update the grammar checker for C# 8 Open

dotnet/csharpstandard#1805 · 1 assignee · Opened Sep 9, 2026
return-by or returns-by – consistency needed Open

dotnet/csharpstandard#1803 · 2 comments · 1 assignee · Opened Sep 7, 2026
Implementation-defined and implementation-specific Open

dotnet/csharpstandard#1802 · 2 comments · 1 assignee · Opened Sep 7, 2026
[Version 14.0] Support optional and named arguments in Expression trees Open

type: feature

Difficulty 4/5 3-5 days Newbie friendliness 48/100

dotnet/csharpstandard#1799 · 1 comment · Opened Sep 3, 2026
`foreach` expansions, value collections. Open

status: needs triaging

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1720 · 5 comments · Opened Jun 26, 2026
dynamic – missing contextual resolution rules Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

dotnet/csharpstandard#1714 · 1 comment · Opened Jun 17, 2026
Apply discard-related changes to deconstructing foreach Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

dotnet/csharpstandard#1711 · Opened Jun 10, 2026
Clarify array initializers and give examples for complex situations Open

dotnet/csharpstandard#1705 · 4 comments · 1 assignee · Opened Jun 1, 2026
Reorganize how record structs are spec'd Open

type: clarity

dotnet/csharpstandard#1697 · 1 assignee · Opened May 19, 2026
Add doc comments to all C.3 types Open

status: in-progress

dotnet/csharpstandard#1677 · 1 assignee · Opened May 6, 2026
Come up with a model w.r.t derived interfaces Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

dotnet/csharpstandard#1676 · Opened May 6, 2026
Refactor pattern description? Open

dotnet/csharpstandard#1668 · 1 assignee · Opened May 5, 2026
Review whether there needs to be some syncing up between §11.2.2 and §9.2.9 *Local variables*, §9.4 *Definite assignment* Open

meeting: discuss

dotnet/csharpstandard#1662 · 14 comments · 1 assignee · Opened May 5, 2026
Check semantics of nested contexts in patterns in v9 Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

dotnet/csharpstandard#1648 · Opened May 5, 2026
Add examples of deconstructor element restrictions Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

dotnet/csharpstandard#1629 · Opened Apr 9, 2026
12.6.6 function member invocation lacks specification of timing of reading receiver Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

dotnet/csharpstandard#1584 · 1 comment · Opened Feb 28, 2026
Create a note around preferring named elements in tuples Open

dotnet/csharpstandard#1574 · 1 assignee · Opened Feb 13, 2026
CallerMemberNameAttribute on parameter of attribute constructor referenced by a local function or its type parameter Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

dotnet/csharpstandard#1553 · Opened Jan 26, 2026
CallerMemberNameAttribute on non-function member Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

dotnet/csharpstandard#1549 · Opened Jan 24, 2026
Incorrect/unclear description of explicit conversions involving user-defined conversions Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

dotnet/csharpstandard#1542 · Opened Jan 23, 2026
Lack of clarity between compile-time and runtime processing of user-defined conversions Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

dotnet/csharpstandard#1541 · Opened Jan 23, 2026
Review spec regarding expressions without types Open

dotnet/csharpstandard#1533 · 5 comments · 1 assignee · Opened Jan 15, 2026
Attribute type list does not contain decimal Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

dotnet/csharpstandard#1522 · 2 comments · Opened Dec 30, 2025
[Tools] Update tools to .NET 10 Open

dotnet/csharpstandard#1514 · 1 assignee · Opened Dec 19, 2025
Retroactive compiler bugfix allowing null conditionals to evaluate to pointer types Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1513 · Opened Dec 19, 2025
Discards and ref assignment Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

dotnet/csharpstandard#1499 · 1 comment · Opened Dec 8, 2025
Clarify the situation with `ref` variables referring to `null` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1498 · Opened Dec 8, 2025
Conformance and new members Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

dotnet/csharpstandard#1490 · 4 comments · Opened Dec 1, 2025
Concern about the definition of `IFormattable` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1481 · 1 comment · Opened Nov 24, 2025
Normative use of a .NET constant not required by this C# spec Open

type: clarity

dotnet/csharpstandard#1479 · 2 comments · 1 assignee · Opened Nov 24, 2025
Evaluation order of (simple) assignments (incl. field assignment, property setter, indexer setter, array element assignment, byref property, byref indexers) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

dotnet/csharpstandard#1478 · 2 comments · Opened Nov 23, 2025
Unclear what is the (ref) safe context of an assignment expression Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

dotnet/csharpstandard#1444 · 1 comment · Opened Oct 31, 2025
"Block body" needs updates in light of expression bodied members Open

type: bug

dotnet/csharpstandard#1434 · 7 comments · 1 assignee · Opened Oct 23, 2025
Define "has no body" to mean `;`, and "has a body" to mean either block body or expression body Open

dotnet/csharpstandard#1430 · 1 assignee · Opened Oct 22, 2025
Revisiting the name of the term "pattern input value” Open

dotnet/csharpstandard#1424 · 1 assignee · Opened Sep 26, 2025
Saying as much as possible in grammar rules vs. saying less there and augmenting with semantic rules in narrative Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

dotnet/csharpstandard#1423 · Opened Sep 26, 2025
Perhaps `value` should not be a contextual keyword Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

dotnet/csharpstandard#1411 · 10 comments · Opened Sep 6, 2025
"Expansion" vs. "Semantic equivalent" Open

dotnet/csharpstandard#1409 · 1 assignee · Opened Sep 4, 2025
Lifted operators and default Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

dotnet/csharpstandard#1405 · Opened Sep 4, 2025
Should a distinct array/string be required when an empty array/string is created? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1403 · 3 comments · Opened Sep 4, 2025
Semantics for required standard library API that is not defined in ISO/IEC 23271:2012 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1400 · Opened Sep 3, 2025
Review ordering of top-level clauses Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

dotnet/csharpstandard#1399 · Opened Sep 3, 2025
namespace_or_type_name is not permitted to reference a static class in a using_directive Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

dotnet/csharpstandard#1388 · Opened Aug 3, 2025
Property & indexer access not fully updated for ref get accessors Open

dotnet/csharpstandard#1371 · 18 comments · 1 assignee · Opened Jul 14, 2025
Static constructor not triggered by inherited static method Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

dotnet/csharpstandard#1315 · 1 reaction · Opened Apr 19, 2025
Reserved member names for non-methods Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

dotnet/csharpstandard#1307 · 1 comment · Opened Apr 10, 2025
IndexerNameAttribute identifier syntax requirement Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

dotnet/csharpstandard#1305 · Opened Apr 4, 2025
IndexerNameAttribute should affect reserved member names Open

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

dotnet/csharpstandard#1303 · 1 comment · Opened Apr 3, 2025
The special names op_Exponent and op_Exponentiation are not reserved for interop. Open

Difficulty 1/5 1-3 hours Newbie friendliness 35/100

dotnet/csharpstandard#1302 · 8 comments · Opened Apr 3, 2025
Unclear documentation of supported attribute array types Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

dotnet/csharpstandard#1299 · 11 comments · Opened Mar 20, 2025

dotnet/csharpstandard

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