The document discusses domain-driven design (DDD) and how it can be applied to building a solar system simulation using C# 3.0 features. It presents the problem of simulating a solar system with configurable planets and physics-based movement. It then outlines a domain model with entities like Universe, Gravity, and Planet. Finally, it shows how C# 3.0 features like lambda expressions, LINQ queries, extension methods, and events can be used to implement the domain and interface.

1. DDD with C# 3.0 features: Solar System Simulation Andre Boonzaaijer, Pieter-Joost van de Sande {aboonzaaijer, pjvdsande}@sogyo.nl http://born2code.net | http://whiletrue.nl | http://sogyo.nl

3. What is “Domain Driven”?

4. It’s not: Layering Presentation Layer Data Layer

5. Layering Presentation Layer Data Layer Business logic

6. Layering Presentation Layer Data Layer Business logic

7. Layering Presentation Layer Data Layer Business logic

8. Layering Presentation Layer Data Layer Business logic +/- 2 years

9. Layering Presentation Layer Data Layer Business logic +/- 2 years +/- 5 years

10. Layering Presentation Layer Data Layer Business logic +/- 2 years +/- 5 years ?

11. Layering Presentation Layer Data Layer Business logic Email SMS Printing Email Where?

12. Layering Presentation Layer Data Layer Business logic

13. Sunflower

15. Gravity (x,y) force = 0; Foreach body in universe force += body.getForce(x,y); body.move(force);

16. Domain

17. Wrapping the domain User Interface Clock Database Bootstrapper / Host

18. User Interface

22. Domain in C# 3.0

23. Domain in C# 3.0

28. Form1 class Methods DrawUniverse: Who is responsible? UI.DrawUniverse() vs Universe.Draw()

29. Universe.Draw() Extension

30. Universe.Draw() Extension