Visual Studio Toolbox: Design Patterns: Observer and Publish-Subscribe

This is the fourth of an eight part series where I am joined by Phil Japikse to discuss design patterns. A design pattern is a best practice you can use in your code to solve a common problem. In this episode, Phil demonstrates the Observer pattern. In this pattern, an object, called the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods. Phil also compares the Observer pattern to the Publish-Subscribe pattern. 

Episodes in this series:

• Command/Memento patterns
• Strategy pattern
• Template Method pattern
• Observer/Publish-Subscribe patterns (this episode)
• Singleton pattern
• Factory patterns
• Adapter/Facade patterns
• Decorator pattern

Resources

• Sample code
• Design Patterns: Elements of Reusable Object-Oriented Software book
• Head First Design Patterns book