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SOLIDify Your Microsoft ASP.NET MVC Applications

SOLIDify Your Microsoft ASP.NET MVC Applications. Simon Laroche Architecte Logiciel PCMS Conseil slaroche@pcms.com. Risks of Poorly Designed Code. Difficult and Expensive to Maintain Buggy Speed of development degrades rapidly Longer and longer test cycles

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SOLIDify Your Microsoft ASP.NET MVC Applications

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  1. SOLIDify Your MicrosoftASP.NET MVC Applications Simon Laroche ArchitecteLogiciel PCMS Conseil slaroche@pcms.com

  2. Risks of Poorly Designed Code • Difficult and Expensive to Maintain • Buggy • Speed of development degrades rapidly • Longer and longer test cycles • A BIG BALL OF MUD is a casually, even haphazardly, structured system. Its organization, if one can call it that, is dictated more by expediency than design.http://www.laputan.org/mud/http://en.wikipedia.org/wiki/Big_ball_of_mud

  3. What is ASP.NET MVC? • Model • The representation of the business rules and data • View • The representation of a single UI component (a form or page, typically) • Controller • Maintains the logic of which View to display, and what data the view needs.

  4. MVC ASP.NET Runtime Model Controller 1 Request 2 3 4 View Response

  5. A Simple ASP.NET MVC Application

  6. Benefits of OOP • -ilities • Reliability • Extensibility • Maintainability • Flexibility • Management of Complexity

  7. S O L I D Principles

  8. SOLID Development Principles • SRP – Single Responsibility Principle • OCP – Open / Closed Principle • LSP – Liskov Substitution Principle • ISP – Interface Segregation Principle • DIP – Dependency Inversion Principle

  9. SRP: What’s a Responsibility? • Persistence • Logging • Exception Handling • Formatting • Rendering / User Interface • “A class should have one, and only one, reason to change.”

  10. SRP Violation

  11. OCP: Changes = New Code • “Modules should be open for extension, but closed for modification.” • Adding features should be handled by adding new code, not changing existing code.

  12. OCP Violation

  13. LSP: Subclasses Extend, Not Remove • “Derived classes must be usable through the base class interface without the need for the user to know the difference” • Subclasses cannot remove functionality, or change expected behaviors, of classes from which they inherit

  14. LSP Violation

  15. ISP: Clients Control Interfaces • “Separate interfaces so callers are only dependent on what they actually use” • Avoid “fat” interfaces • Tailor interfaces to clients • Consider packaging interface with client

  16. ISP Violation

  17. DIP: Depend on Abstractions • “Inject” dependencies into classes • Infrastructure should depend on core domain classes, not the other way around • Classes should not decide particulars of how their collaborators’ work is done – separate concern

  18. DIP: Depend on Abstractions

  19. DIP: Depend on Abstractions

  20. DIP Violation

  21. Simple Design Rules • Runs all the tests • Contains no duplication • Expresses the intent of the programmer • Minimizes the number of classes and methods • The rules are given in order of importance. Kent Beck, Extreme Programming Explained

  22. Don’t Repeat Yourself (DRY) • "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system." • Eliminating duplication is at the heart of many design patterns and OOP principles

  23. Refactoring : Make It Right

  24. Recommended Books • Agile Software Development • Agile Principles, Patterns, and Practices in C# • Clean Code All written by Robert C. “Uncle Bob” Martin Also see: http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod

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