Framework Design Guidelines

Communication Artifacts ,[object Object],[object Object],[object Object],[object Object],[object Object]

Hungarian Notation ,[object Object],public class CMyClass { int CompareTo (object objValue) {..} string lpstrName {get;} int iValue {get;} }

On Abbreviations, acronym, initialism and the like… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Constructors are ,[object Object],[object Object],[object Object],public class XmlFile { string filename; Stream data; public XmlFile(string filename) { this.data = DownloadData(filename); } } lazy

Properties ,[object Object],[object Object],[object Object],[object Object],public class ArrayList { public int Count {get;} }

Properties versus Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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

 CONSIDER using extension methods to "add" methods to interfaces

 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){ … } } }

 AVOID frivolously defining extension methods, especially on types you don’t own ,[object Object],[object Object],[object Object],[object Object]

 AVOID defining extension methods on System.Object

What we ship: Too much and not enough…

Abstract and Base classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Virtual Methods ,[object Object],[object Object],[object Object],[object Object],[object Object]

Overriding Methods ,[object Object],[object Object],[object Object],[object Object]

To Virtual Or Not Virtual … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Barbara Liskov

Interfaces ,[object Object],[object Object],[object Object],[object Object],[object Object],public interface IComparable { int CompareTo(object obj); }

Libraries , Primitives, Abstractions

 CONSIDER placing library types higher on the dependency stack ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

 DO keep primitives policy free (i.e. simple) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Test Driven Development ,[object Object],[object Object]

Heavy Dependencies & Testability

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); } }

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

The Power of Sameness ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The perilous summit of complexity by example

How do I read all the lines from a file?

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

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

Open.. Looks like a good first step…

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

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

I think I am in the wrong place..

Back up, let’s try a different type

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

Thanks goodness there was a sample

The pit of success way ,[object Object]

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

Make the simple things simple and the hard things possible

References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Framework Design Guidelines

Empfohlen

Empfohlen

Weitere ähnliche Inhalte

Was ist angesagt?

Was ist angesagt? (20)

Andere mochten auch

Andere mochten auch (6)

Ähnlich wie Framework Design Guidelines

Ähnlich wie Framework Design Guidelines (20)

Mehr von Mohamed Meligy

Mehr von Mohamed Meligy (7)

Kürzlich hochgeladen

Kürzlich hochgeladen (20)

Framework Design Guidelines