C# has evolved significantly over time, from version 1 through the latest version 8. Some key developments include the addition of generics, LINQ, asynchronous programming, and dynamic features. C# continues to focus on productivity and safe, efficient code with recent versions adding capabilities like nullable reference types, async streams, and ranges/indices. .NET has also evolved with improvements to performance and new functionality in versions like .NET Core 2.1. Looking ahead, .NET Core 3 will add support for desktop frameworks like WinForms and WPF.

1. Rodolfo Finochietti
C#: Past, Present and Future
@rodolfof

2. C# 1
C# 2
C# 3
Managed Code
Generics
LINQ
C# 4 Dynamic programming
C# 5
The evolution of C#
Asynchronous programming
C# 8
Productivity
C# 6 Compiler as a Service
C# 7.X
?

3. Most popular languages
https://insights.stackoverflow.com/survey/2018

4. Most popular (programming) languages
https://insights.stackoverflow.com/survey/2018

5. Most loved languages
https://insights.stackoverflow.com/survey/2018

6. C# 7.0, 7.1, 7.2 and 7.3
• Safe, efficient code
• Avoid garbage collection
• Avoid copying
• Stay safe
• More freedom
• Allow more things
• Less code
• Say it shorter

7. C# 7

8. Out variables

9. Tuples

10. Tuples

11. Tuples

12. Discards

13. Pattern matching

14. Pattern matching

15. Pattern matching

16. Local functions

17. Local functions

18. Numeric literal syntax improvements

19. C# 7.1

20. Async main

21. Inferred tuple element names

22. C# 7.2

23. Safe efficient code enhancements
• Work with value types while using reference semantics
• in
• ref readonly
• readonly struct
• ref struct

24. Non-trailing named arguments
Named arguments that precede positional arguments when
those named arguments are in the correct positions
PrintOrderDetails("Gift Shop", 31, "Red Mug")
PrintOrderDetails(sellerName: "Gift Shop", 31, productName: "Red Mug");
PrintOrderDetails(productName: "Red Mug", sellerName: "Gift Shop", orderNum: 31)

25. private protected access modifier
A new compound access modifier:
private protected
Indicates that a member may be accessed by containing
class or derived classes that are declared in the same
assembly.

26. C# 7.3

27. Enabling more efficient safe code
• Access fixed fields without pinning
• Reassign ref local variables
• Initializers on stackalloc arrays
• Fixed statements with any type that supports a pattern
• Additional generic constraints

28. Make existing features better
• Operators == and != with tuple types
• Expression variables in more locations
• Attach attributes to the backing field of auto-
implemented properties
• Method resolution when arguments differ by in has been
improved
• Overload resolution now has fewer ambiguous cases

29. New compiler options
• New compiler options support new build and DevOps
scenarios
• -publicsign to enable Open Source Software (OSS) signing of
assemblies.
• -pathmap to provide a mapping for source directories.

30. C# 8

31. Nullable reference types

32. Async streams

33. Ranges and indices

34. Default implementations of interface
members

35. Recursive patterns

36. Recursive patterns

37. Switch expressions

38. Target-typed new-expressions
The implementation of this feature was contributed by a member of the community, Alireza Habibi

39. Bonus track
.NET

40. .NET 2.1

41. .NET Core 2.1
• Faster Build & Runtime Performance
• Close gaps in ASP.NET Core and EF Core
• Improve compatibility with .NET Framework
• GDPR and Security
• Microservices and Azure
• Faster Internal Engineering System

42. .NET Core 2.1 Tooling Performance
0
20
40
60
80
100
120
2.0 2.1-preview 2.1 RC
INCREMENTAL BUILD TIME FOR .NET CORE SDK

43. .NET Core 2 is Fast
Data sourced from official tests available at TechEmpower Round 14.

44. .NET Core 2.1 is Faster!
2.6MM
599K
97K
2.9MM
662K
216K
-
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
Plaintext JSON Fortunes (data access)
RUNTIME PERFORMANCE
.NET Core 2.0 .NET Core 2.1
Data sourced from official tests available at TechEmpower Round 14.

45. .NET Core 2.1 Major Features
• Global Tools
• Span<T>
• Sockets
• HttpClient Performance
• Windows Compatibility
Pack

46. .NET Core 2.1 for IoT
.NET Core now supported on Azure IoT Hub Samsung
Visual Studio Tools for Tizen

47. .NET vNext
Desktop, Desktop, Desktop

48. .NET Core 3
• Focus in the Desktop:
• Supports WinForms and WPF frameworks
• Access to all the Windows 10 API’s

49. Why Windows Desktop on .NET Core?
• Side-by-side versions of .NET that support WinForms and
WPF
• Embed .NET directly into an application:
• Take advantage of .NET Core features

50. .NET Framework 4.8
• Focus in the Desktop too!
• Modern browser and modern media controls
• Access to touch and UWP Controls
• High DPI improvements

51. Highly-compatible,
targeted improvements,
like last few releases
• XAML Islands - WinForms & WPF apps
can host UWP controls
• HDPI and accessibility improvements
• .NET Framework support unchanged
(supported for life of Windows)
• XAML Islands - WinForms & WPF apps can host UWP controls
• Full access to Windows 10 APIs
• Side-by-side support & self contained exes
• Desktop pack to enable porting existing apps
to .NET Core
UWP
Windows-only
DATAWEB
ASP.NET
Core
EF Core
AI/ML
ML.NET
WPF
.NET Core 3Desktop Packs.NET Framework 4.8
.NET STANDARD
Existing App
Highly
compatible
updates
.NET Core
3.0 with
Desktop
Packs
Install .NET
Core updates
per your
needs
Modernize Desktop Apps with .NET Core 3
Windows-only
.NET STANDARD
Cross-platform
Windows
Forms
Update .NET Framework Apps
EF6 (cross-plat)

52. Links
• Previews
• github.com/dotnet/csharplang/wiki
• Docs:
• docs.microsoft.com/en-us/dotnet/csharp/whats-new/

54. #EXPLOTAAA
¡GRACIAS!