C# Features

[adrianoc]

The order of the entries DOES NOT imply any priority

Features I DON'T plan to Support

• async/await
• yield iterators
• Async Streams

12.0

• Interceptors

Features I DO plan to Support

Math Operators

• + (plus)
• - (minus)
• * (times)
• / (div)
• % (mod)

Relational Operators

• >=
• <=
• !=

Logical Operators

• &&
• ||
• ^ (xor)

Bitwise / Shift Operators

• &
• |
• ^ (xor)
• << (left shift)
• >> (right shift)

Statements

• Implement while support #236
• for
• switch
• Implement foreach support #235

Misc

• Implement array/indexer access support #54 - Array accessor / Indexers
• Throw statements
• Support cast operator #88
• events
• default(T)
• Pointers #20 - Pointers
• volatile fields
• Support stackalloc #16 - Stackalloc
• Support fixed #17 - fixed
• co/contra variance in interface declarations
• co/contra variance in delegate declarations
• delegates
• Ternary Operator
• Unary Operators
• Add support for non capturing lambda expressions #101
• Multi-dimensional arrays
• Add support for implicit/explicit user defined conversions #103
• Add support for *const* modifiers #109
• Default parameter values
• Support using statements #177
• Support as operator #238
• Support null coalescing operator #253

Generics

• Using existing generics
• Declare generic struct
• Declare generic class
• Declare generic instance method
• Declare generic static method
• Declare generic instance property
• Declare generic static property
• Declare constraints
• delegates
• events

6.0

• Null-Conditional Operator #96
• nameof() #95
• Add support for interpolated strings #107

7.x

• Throw expressions
• Numeric Literals
• Add suppor for local functions #124
• ref locals & returns (MSDN)
• Expression bodied members
• Out variables
• readonly structs
• Support for Tuples #93
• Private protected access modifier
• Deconstructors #296

8.0

• Ranges (Partially supported)
• readonly members
• Recursive Patterns (partial support)

9.0

• Function pointers
• Top level statements
• Init only setters
• covariant returns
• Add support for records #273

10.0

• Parameterless struct constructors #118
• CallerArgumentExpression #119

11.0

• Generic Attributes #117
• Static Abstract Interfaces #120
• Raw literal strings
• Add support for Utf8 string literals #221
• ref fields
• nameof(parameter)
• file local types

12.0

• Collection expressions #256
• Inline arrays #257

Working set

• params Span + stackalloc any type

Features I am NOT SURE if it worth supporting

Misc

• Anonymous types

7.0

• Discards
• Pattern Matching
• Generalized Async return types

7.1

• Default literal expression
• Inferred tuple element names

7.2

• Conditional ref expressions
• in parameters
• ref struct

8.0

• Default Interface Methods
• Nullable References
• Enhanced using
• stackalloc in nested contexts
• Static local functions