With the Factory Pattern we provide a clean way to instantiate an object unknown to us at the time of implementation. The only thing we know is the interface of the object with a set of predefined properties and methods we need to use. More…
The Repository Pattern is a common construct to avoid duplication of data access logic throughout our application. This includes direct access to a database, ORM, WCF dataservices, xml files and so on. The sole purpose of the repository is to hide the nitty gritty details of accessing the data. More…
The Chain of Responsibility pattern takes a request and flows through a chain of handlers. Each handler checks if it can handle the request according to some business rules. If the handler can’t handle the request it gets passed to the next handler in the chain. More…
The Command Pattern makes a execution request into an object. This makes it possible to store, search and transport requests and let clients call them via a common interface. This pattern is often used to implement undo or macro operations. More…
The last post in the SOLID by Example series deals with the Dependency Inversion Principle (DIP). It states that high-level classes should not depend on low-level classes. Both should depend on abstractions. Abstractions should not depend on details. More…
The fourth post in the SOLID by Example series deals with the Interface Segregation Principle (ISP). It states that clients should not be forced to implement interfaces they don’t use. Or as Uncle Bob puts it: Make fine grained interfaces that are client specific. More…
The third post in the SOLID by Example series deals with the Liskov Substitution Principle (LSP). It states that derived classes must be substitutable for their base classes. The principle was first mentioned by Barbara Liskov in the late eighties. More…
The second post in the SOLID by Example series deals with the Open / Closed Principle (OCP). This is the notion that an object should be open for extension, but closed for modification.
For us developers S.O.L.I.D.