Framework Design Guidelines

 Krzysztof Cwalina Program Manager Microsoft Corporation http://blogs.msdn.com/kcwalina
 Brad Abrams
Product Unit Manager
Microsoft Corporation http://blogs.msdn.com/brada

Dow Jones Industrial Average @ 9,000

Framework Design Artifacts:
Properties
Methods
Events
Constructors

public class XmlFile { string filename; Stream data; public XmlFile(string filename) { this.data = DownloadData(filename); } } public XmlFile(string filename) { this.filename = filename; } lazy

public class ArrayList { public int Count {get;} }

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

Time to cut…

public class TheBase : Object { public override string ToString() { return “Hello from the Base"; } } public class Derived : TheBase { public override string ToString() { return “Hello from Derived"; } }

Derived d = new Derived(); Console.WriteLine (d.ToString()); TheBase tb = d; Console.WriteLine (tb.ToString()); Object o = tb; Console.WriteLine (o.ToString());

All Virtual members should define a contract
Don’t require clients to have knowledge of your overriding
Should you call the base?

Barbara Liskov

public interface IComparable { int CompareTo(object obj); }

Careful dependency management is the necessary ingredient to successful evolution of frameworks. Without it, frameworks quickly deteriorate and are forced out of relevance prematurely.

   BCL WPF XML Reflection

Climbing a mountain?

Scaling a peak?

Running across a desert?

Falling into a pit?

Read the manual??

The Power of Sameness

P ascal C asing – Each word starts with an uppercase letter
c amel C asing – First word lower case, others uppercase
SCREAMING_CAPS – All upper case with underscores

public class MemberDoc { public int CompareTo(object value) public s tring Name { get;} }

public class CMyClass { int CompareTo (object objValue) {..} string lpstrName {get;} int iValue {get;} }

Brad Abrams http://blogs.msdn.com/brada Krzysztof Cwalina http://blogs.msdn.com/kcwalina Please fill out the session evals!

© 2008 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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Framework Design Guidelines

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Framework Design Guidelines Presentation Transcript