C# E volution

1. C# Evolution • Mariusz Bojkowski

2. Mariusz Bojkowski • Passionate programmer • Focused on C# / .NET • Has a blog: https://CSharp.Today • Twitter: @CSharpToday • Facebook: https://fb.me/CSharp.Today

3. Agenda • CoolConception • The C# Name • C# Features • The new C# 8.0

4. COOL Conception

5. https://1.fwcdn.pl/an/49468/2015/67365.12.jpg Picture source: https://cdn1.img.sputniknews.com/images/105081/72/1050817252.jpg

6. 1996 Dolly the Sheepwas born https://timedotcom.files.wordpress.com/2016/06/dolly.jpeg

7. Common Language Runtime 1996 Developed as incubation project by COM+ team

8. Common Language Runtime 1996 Developed as incubation project by COM+ team Called COR

9. WhatdoesCOR stand for?

10. WhatdoesCOR stand for? HINTSDeveloped by COM+ teamCOM means Component Object Model

11. Component Object Runtime =COR

12. 1998 Google was founded https://www.qs.com/4-things-your-university-brand-learn-from-googles-new-logo/

13. CLR team started 1998 CLR was written in SMC

14. What does SMC stand for?

15. Simple Managed C = SMC

16. 1999 Star Wars: Episode I https://upload.wikimedia.org/wikipedia/en/4/40/Star_Wars_Phantom_Menace_poster.jpg

17. Team to build new language 1999 Anders Hejlsberg co-designed • Turbo Pascal • Delphi • C# • TypeScript

18. What was the code name?

19. What was the code name? HINTIt was very cool code name

20. What was the code name? COOL

21. What does COOL stand for?

22. C-like Object Oriented Language = COOL

23. 2000 https://i.iplsc.com/windows-me/0004KX25O7X73W9L-C122-F4.jpg

24. 2000 Polish instant messenger https://gadu-gadu.pl/

25. COOL renamed to C# 2000 .NET announced .NET ported to C# ASP.NET ported to C#

26. 2002 was founded https://www.spacex.com/

27. 2018 2002 was founded https://www.spacex.com/

28. Visual Studio .NET released 2002 C# 1.0 .NET Framework ASP.NET

29. The C# name

30. When C# name was used for the first time? HINTs ? 2000 – Cool renamed C# 1999 – Created team to build COOL / C# 1998 – Created team to build CLR 1996 – First work on CLR

31. 1988 When C# name was used for the first time? Picture source: https://www.urbanghostsmedia.com/wp-content/uploads/2015/06/delorean-time-machine-2.jpg

32. MS used C# name for the first time 1988 Variant of C language Designed for incremental builds The project wasn’t finished

33. C# name origin Inspired by musical notation A note should be a semitone higher C♯

34. C# name origin Inspired by musical notation A note should be a semitone higher

35. C# name origin Like C++ is a next version of C The same C♯ is a next version of C++

36. C# name origin Musical sharp (♯) was simplified to number sharp (#) C♯ → C#

37. C# Features

38. partials

39. Partial types partialclassPartialClassExample { void Method1() { } } partialclassPartialClassExample { voidSomeOtherMethod() { } }

40. Partial methods • partialclassPartialMethods • { • partialvoidDoWork(); • } • partialclassPartialMethods • { • partialvoidDoWork() •     { • // Do something •     } • }

41. MethodsdelegatesLambdas

42. Methods, events, handlers publiceventEventHandlerMyEvent; voidEventExample() { MyEvent += newEventHandler(EventExample_MyEvent); } publicvoidFireMyEvent() { EventHandlermyEvent = MyEvent; if (myEvent != null) { myEvent(this, EventArgs.Empty); } }

43. Method group conversions voidEventExample() { MyEvent += newEventHandler(EventExample_MyEvent); }

44. Method group conversions voidEventExample() { MyEvent += newEventHandler(EventExample_MyEvent); } voidEventExample() { MyEvent += EventExample_MyEvent; }

45. Anonymous methods • voidEventExample() • { • // Use anonymous methods • MyEvent += delegate (objectsender, EventArgsargs) •     { • // Do somework •     }; • }

46. Lambda expressions • voidEventExample() • { • // Use lambda expressions • MyEvent += (sender, args) => •     { • // Do somework •     }; • }

47. Extension methods • publicstaticvoidMyMethod(thisstring s) { } • staticvoidExample() • { • "value".MyMethod(); • }

48. Expression trees • Expression<Func<int, int, int>> sumExpression = •     (a, b) => a + b; • int sum2 = sumExpression.Compile()(1, 2);

49. Query expressions • varadults = • from person indb.People • whereperson.Age > 18 • selectnew { person.FirstName, person.LastName };

50. local functions • voidMyMethod(int value) • { • LocalFunction(); • voidLocal() { }// Can access ‘value’ • }