Framework Design Guidelines

3. Four Keys of Framework Design

4. Outline

5. Naming Conventions

6. Saying It Load

9. Member Design

13. EmployeeList l = FillList(); for (int i = 0; i < l.Length; i++){ if (l.All[i] == x){...} } public Employee[] All {get{}} Moral: Use method if the operation is expensive Calling Code Properties and returning arrays

14. Extension Methods

15.  CONSIDER using extension methods to &quot;add&quot; methods to interfaces

16.  CONSIDER using extension methods to manage dependencies Uri uri = “ftp://some.ftp.uri”.ToUri(); // higher level assembly (not mscorlib) namespace System.Net { public static class StringExtensions{ public static Uri ToUri(this string s){ … } } }

18.  AVOID defining extension methods on System.Object

19. Type Design

20. Start Run

22. What we ship: Too much and not enough…

29.   

31. Libraries , Primitives, Abstractions

35. Trends

37. Heavy Dependencies & Testability

38. Inversion of Control // your better API public abstract class TraceListener { public abstract void Trace(string message); } public class Tracer { TraceListener listener; public Tracer( TraceListener listener ){ this.listener = listener; } public void Trace(string message){ listener.Trace(message); } }

39. Dependency Injection Check Containers like: Spring.NET, Castle Windsor , Structuremap, , Unity … MEF session tomorrow will talk about it (isA)

41. The perilous summit of complexity by example

42. How do I read all the lines from a file?

43. VS7 Era “ IO” seems like a reasonable place to start

44. Why did they make it inaccessible Backup, and try again…

45. Open.. Looks like a good first step…

46. Hmm… OK, what do I do with a FileStream?

47. Ok good, synchronous and asynchronous operations.. What the heck is that?

48. I think I am in the wrong place..

49. Back up, let’s try a different type

50. Ahh, ReadLine(), this looks more promising..

51. OK, How do you find the end?

52. Thanks goodness there was a sample

54. Just what I need…

55. Ah, a string[] I know just what to do with that…

56. How simple!

57. Tools

58. Framework Design Tools

65. Make the simple things simple and the hard things possible