C# Language Design Notes for 2024

Mon Dec 9, 2024

C# Language Design Meeting for December 9th, 2024

• First-class span open questions
• Simple Lambda Parameters
• Collection expression arguments

Wed Dec 4, 2024

C# Language Design Meeting for December 4th, 2024

• First-class span open questions
  • Preferring ReadOnlySpan<T> over Span<T> conversions
  • Conversions in expression trees

Wed Nov 20, 2024

C# Language Design Meeting for November 20th, 2024

• Extensions
• Dictionary Expressions

Wed Nov 13, 2024

C# Language Design Meeting for November 13th, 2024

• Extensions

Mon Nov 4, 2024

C# Language Design Meeting for November 4th, 2024

• not and or patterns
• Notes on notes

Wed Oct 30, 2024

C# Language Design Meeting for October 30th, 2024

• Extensions

Mon Oct 28, 2024

C# Language Design Meeting for October 28th, 2024

• Increment and Decrement Operators in null conditional access
• yield in try / catch

Mon Oct 21, 2024

Canceled

Wed Oct 16, 2024

C# Language Design Meeting for October 16th, 2024

• Simple lambda parameters
• Unbound generic types in nameof
• typeof string constants

Mon Oct 14, 2024

C# Language Design Meeting for October 14th, 2024

• Extensions

Wed Oct 9, 2024

C# Language Design Meeting for October 9th, 2024

• Extensions

Mon Oct 7, 2024

C# Language Design Meeting for October 7th, 2024

• Extensions

Wed Oct 2, 2024

C# Language Design Meeting for October 2nd, 2024

• Open questions in field
  • readonly contexts and set
  • Conditional code
  • Interface properties and auto-accessors
• Extensions

Mon Sep 30, 2024

C# Language Design Meeting for September 30th, 2024

• Extensions

Wed Sep 25, 2024

• C# 14 (no notes)

Mon Sep 23, 2024

• Design review (no notes)

Wed Sep 18, 2024

C# Language Design Meeting for September 18th, 2024

• Nullability in field
• Extensions naming

Wed Sep 11, 2024

C# Language Design Meeting for September 11th, 2024

• Better conversion from collection expression and params collections
• First-class span types
  • Reverse
  • New ambiguities
  • Covariant arrays

Wed Sep 4, 2024

C# Language Design Meeting for September 4th, 2024

• Triage (no milestone)
  • Type inference using method group natural type
  • Collection Expressions Next (C#13 and beyond)
  • Dictionary expressions
  • Extending patterns to "as"
  • params in parameters
• Triage (working set)
  • Only Allow Lexical Keywords in the Language
  • Permit variable declarations under disjunctive patterns
  • CallerCharacterNumberAttribute
  • Task<T> nullability covariance
  • Nullable analysis of LINQ queries

Wed Aug 28, 2024

C# Language Design Meeting for August 28th, 2024

• Nullable in ref ternaries
• Block-bodied switch expression arms

Mon Aug 26, 2024

C# Language Design Meeting for August 26th, 2024

• field keyword open questions
  • field in property initializers
  • Interaction with partial properties
  • readonly field

Wed Aug 21, 2024

C# Language Design Meeting for August 21st, 2024

• Better conversion from collection expression
• field keyword nullability

Mon Aug 19, 2024

C# Language Design Meeting for August 19th, 2024

• Better conversion from collection expression

Wed Aug 14, 2024

C# Language Design Meeting for August 14th, 2024

• field keyword
  • field nullability
  • field in event accessor
  • Scenarios similar to set;

Wed Jul 24, 2024

C# Language Design Meeting for July 24th, 2024

• Discriminated Unions
• Better conversion from collection expression with ReadOnlySpan<T> overloads

Mon Jul 22, 2024

C# Language Design Meeting for July 22nd, 2024

• Extensions
• Ref structs implementing interfaces

Wed Jul 17, 2024

C# Language Design Meeting for July 17th, 2024

• Overload resolution priority open questions
• Better conversion from collection expression with ReadOnlySpan<T> overloads

Mon Jul 15, 2024

C# Language Design Meeting for July 15th, 2024

• field keyword
• First-Class Spans Open Question

Wed Jun 26, 2024

C# Language Design Meeting for June 26th, 2024

• Extensions

Mon Jun 24, 2024

C# Language Design Meeting for June 24th, 2024

• First-Class Spans
• field questions
  • Mixing auto-accessors
  • Nullability

Mon Jun 17, 2024

C# Language Design Meeting for June 17th, 2024

• params Span breaks
• Overload resolution priority questions
  • Application error or warning on overrides
  • Implicit interface implementation
• Inline arrays as record structs

Wed Jun 12, 2024

C# Language Design Meeting for June 12th, 2024

• params Span breaks
• Extensions

Mon Jun 10, 2024

C# Language Design Meeting for June 10th, 2024

• ref structs implementing interfaces and in generics

Mon Jun 3, 2024

C# Language Design Meeting for June 3rd, 2024

• Params collections and dynamic
• Allow ref and unsafe in iterators and async

Wed May 15, 2024

C# Language Design Meeting for May 15th, 2024

• field and value as contextual keywords
  • Usage in nameof
  • Should value be a keyword in a property or indexer get? Should field be a keyword in an indexer?
  • Should field and value be considered keywords in lambdas and local functions within property accessors?
  • Should field and value be keywords in property or accessor signatures? What about nameof in those spaces?
• Dictionary expressions

Mon May 13, 2024

C# Language Design Meeting for May 13th, 2024

• First-class span types questions
  • Delegate conversions
  • Variant conversion existence
• Overload resolution priority questions
  • Attribute shape and inheritance
  • Extension overload resolution

Wed May 8, 2024

C# Language Design Meeting for May 8th, 2024

• readonly for primary constructor parameters

Wed May 1, 2024

C# Language Design Meeting for May 1st, 2024

• Adjust binding rules in the presence of a single candidate

Wed Apr 24, 2024

C# Language Design Meeting for Apr 24th, 2024

• Adjust dynamic binding rules for a situation of a single applicable candidate

Mon Apr 22, 2024

C# Language Design Meeting for Apr 22nd, 2024

• Effect of language version on overload resolution in presence of params collections
• Partial type inference: '_' in method and object creation type argument lists

Wed Apr 17, 2024

C# Language Design Meeting for Apr 17th, 2024

• Relax Add requirement for collection expression conversions to types implementing IEnumerable
• Extensions

Mon Apr 15, 2024

C# Language Design Meeting for Apr 15th, 2024

• Non-enumerable collection types
• Interceptors
• Relax Add requirement for collection expression conversions to types implementing IEnumerable

Mon Apr 8, 2024

C# Language Design Meeting for Apr 8th, 2024

• Implementation specific documentation

Mon Apr 1, 2024

C# Language Design Meeting for Apr 1st, 2024

• Async improvements (Async2)

Wed Mar 27, 2024

C# Language Design Meeting for Mar 27th, 2024

• Discriminated Unions

Mon Mar 11, 2024

C# Language Design Meeting for Mar 11th, 2024

• Dictionary expressions

Mon Mar 4, 2024

C# Language Design Meeting for Mar 4th, 2024

• Breaking changes: making field and value contextual keywords
• Overload resolution priority

Wed Feb 28, 2024

C# Language Design Meeting for Feb 28th, 2024

• Extensions

Mon Feb 26, 2024

C# Language Design Meeting for Feb 26th, 2024

• ref structs in generics
• Collection expressions

Wed Feb 21, 2024

C# Language Design Meeting for Feb 21st, 2024

• Declaration of ref/out parameters in lambdas without typename
• params collections
  • Metadata format
  • params and scoped across overrides
  • required members and params parameters

Wed Feb 7, 2024

C# Language Design Meeting for Feb 7th, 2024

• Partial type inference
• Breaking change warnings

Mon Feb 5, 2024

C# Language Design Meeting for Feb 5th, 2024

• First-class span types
• Collection expressions: inline collections

Wed Jan 31, 2024

C# Language Design Meeting for January 31st, 2024

• Relax "enumerable" requirement for collection expressions
• params collections evaluation orders

Mon Jan 29, 2024

C# Language Design Meeting for January 29th, 2024

• params collections
  • Better function member changes
  • dynamic support
• dynamic and ref local function bugfixing

Mon Jan 22, 2024

C# Language Design Meeting for January 22nd, 2024

Wed Jan 10, 2024

C# Language Design Meeting for January 10th, 2024

• Collection expressions: conversion vs construction

Mon Jan 8, 2024

C# Language Design Meeting for January 8th, 2024

• Collection expressions
  • Iteration type of CollectionBuilderAttribute collections
  • Iteration type in conversions