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C# - Gang Of Four - Design Patterns, Elements Of Reusable Object Oriented Software Erich Gamma, John M. Vlissides, Ralph Johnson, Richard Helm
Publisher: Addison-Wesley Professional

For many applications, delegates simplify the use of elegant design patterns (Observer, Strategy, State[GoF]) composed of very loosely coupled objects. In next posts, I will pick each one of original 23 GOF design patterns, discuss pros, cons & need, UML diagrams for patterns and simple code illustration in C#. This concept is used when you want some information stored in one object, in C# by the introduction of “Events and Delegates” concept. Standard C++ does not have true object-oriented function pointers. Gamma is one of the “Gang of Four” who shook up software development back in 1994 with the book Design Patterns: Elements of Reusable Object-Oriented Software. More recently, C# has popularized the delegate concept, contributing to the success of that language. I am actually a VB.NET developer (C# in the I will also note that this is a great book for those of you familiar or have read the GoF book Design Patterns Elements of Reusable Object Oriented Software. Tutorial: Common Design Patterns in C# 4.0. The Gang of Four, in their seminal work “Design Patterns: Elements of Reusable Object-Oriented Software”, referred to inheritance as a threat to encapsulation and stated that object composition should be preferred to it. Gang of four is nothing to do with technical sense, it's name of four authors(Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides) of book Design Patterns: Elements of Reusable Object-Oriented Software. Classical formulation of it could be found in “Design Patterns, Elements of Reusable Object Oriented Software” by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (The Gang of Four). Net framework and Java even provide the ability to prevent inheritance (via the sealed keyword in C#, NotInheritable in VB.Net, and Final in Java). There are many reasons for the conflicted relationship. The resolution of the problem is easier in C#, because all classes are inherited from the same “object” class. This project appears to be These patterns all come from the well known “Gang of Four” book, Design Patterns: Elements of Reusable Object-Oriented Software. In fact I highly recommend downloading the code samples from the WROX website (WROX Code Download) The entire set of code samples are in C#, but don't let this slow up any VB.NET devs out there. [GoF] "Design Patterns: Elements of Reusable Object-Oriented Software", E. I thought it would be an interesting exercise to try and port each of the patterns described in the Gang of Four's seminal work Design Patterns: Elements of Reusable Object-Oriented Software into C#. In design pattern we often listen the term Gang of Four, GOF, or GO4. Data and Object Factory Page on the Command Pattern http://www.dofactory.com/Patterns/PatternCommand.aspx.