The document summarizes new features in C# 7.X and beyond. C# 7.0 introduced features like tuples, pattern matching, expression-bodied members, and value tasks. C# 7.1 added inferred tuple element names and default expressions. C# 7.2 brought non-trailing named arguments, protected internal, and ref readonly. Future versions will include nullable references, records, and slicing with ranges. The document outlines features already released and those still under development for improving C# in areas like concurrency, syntax, and performance.

1. C# 7.X and beyond
Andrea Angella, March 2018

2. C# 7.0
C# 7.1
C# 7.2

5. C# 7.0, 7.1 and 7.2 features
10. Ref returns and locals
11. Async Main
12. Default expressions
13. In Parameters
14. Ref readonly
15. Readonly struct
16. Ref struct
17. Private Protected access modifier
18. Non-Trailing named arguments
1. Inline Out Variable
2. Tuples
3. Pattern Matching in Is Expression
4. Pattern Matching in Switch Statement
5. Local Functions
6. Throw Expressions
7. Binary Literals and Digit Separators
8. Expression bodied members
9. ValueTask<T>

6. C# 7.3 and future features
14. Fixed sized buffers
15. Negation of if/while condition
16. Extension everything
17. Async Enumerable and Async Dispose
18. Query foreach
19. Null-conditional await
20. Null-coalescing assignments
21. Default implementation in interfaces
22. Dictionary literals
23. Constant patterns
24. is not pattern?
25. Methods in Enums
26. Implicitly scoped using statement
1. Ref local assignment expression
2. Ref this for extension methods
3. by value vs `in` overload tiebreaker
4. Attributes on auto-implemented properties
5. New generic constraints
6. Operators == and != for Tuples
7. IEnumerable<T> in params
8. Target typed stackalloc initializers
9. Utf8 string literal
10. Nullable References
11. Records
12. Slicing with Ranges
13. Native Number Types

7. C# 7.0

8. Inline Out Variables

9. Expression Bodied Members

10. Binary Literals and Digit Separators

11. Is Expression with Pattern Matching

12. Switch Expression with Pattern Matching

13. Local Functions

14. Tuples

15. Tuples Deconstruction

16. Throw Expressions

17. ValueTask<T>

18. Ref Returns and Locals

19. C# 7.1

20. Inferred Tuple Element Names

21. Default Expression

22. Async Main

23. C# 7.2

24. Non Trailing Named Arguments

25. Protected Internal

26. Private Protected

27. Ref Readonly

28. In Parameters

29. Readonly Struct

30. Ref Structs

31. Span<T> and Memory<T>

32. C# 7.3
DISCLAIMER: Everything from here on is all under
active development and subject to change!

33. C# 7.3 Progress Board

34. C# Language Design Meetings

35. Ref local assignment expression

36. Ref this for extension methods

37. By value vs `in` overload tiebreaker

38. New generic constraints

39. Attributes on auto-implemented properties

40. Operators == and != for Tuples

41. Target typed stackalloc initializers

42. IEnumerable<T> in params

43. C# 8.0
DISCLAIMER: Everything from here on is all under
active development and subject to change!

44. Nullable References
https://github.com/dotnet/csharplang/wiki/Nullable-Reference-Types-Preview

45. Records
With expressions

46. Slicing with Ranges

47. Extension Everything

48. Async Enumerable and Dispose

49. Default implementation in interfaces

50. Native Number Types
nint
nuint

51. Fixed sized buffers

52. Negation of if/while condition

53. Null-conditional await

54. Null-coalescing assignments

55. Implicitly scoped using statement

56. C# X.X
DISCLAIMER: Everything from here on is all under
active development and subject to change!

57. utf8 string literals

58. Query-foreach

59. More caller member attributes

60. Readonly for locals and parameters

61. Dictionary Literals

62. … and more proposals
https://github.com/dotnet/csharplang/labels/Proposal

63. Follow Andrea at www.productivecsharp.com
www.productivecsharp.com

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65. I C#
JavaScript?

66. Thanks