The Decorator Pattern that has been applied to an existing program to add features to cars is discussed in two videos which this is the first of. This video covers the code written to build the component, concrete component and decorator. In this scenario, it's explained how the class 'car' represents the component, the class size (compactCar/ fullSizeCar) represents the concrete component and how the class 'CarDecorator' represents the decorator.
- [Voiceover] I'm going to continue with the car example…so let's open up the solution for decorator…from your exercise folder…and I'll step through this code.…Now on the righthand side of the Solution Explorer,…you see that I created a folder…for each of the key classes…I showed in our class diagram.…Component, concrete component,…decorator and concrete decorator…and if we were to flip back to our class diagram,…we have component, concrete component,…decorator, and our two concrete decorators.…
Let's first go to the component folder…and open up car.…The component from the class diagram…is the car which here is an abstract class…that has two abstract method signatures and a property.…Property being description, the two abstract methods…being get description and get car price.…Very straight forward.…Now let's navigate to the concrete component folder…and open up compact car.…This is our concrete implementation of the component.…
I created two files like these.…One for compact car…and one for full size car…which is very similar to the code here.…
Author
Reynald Adolphe
Released
5/31/2016In this course, developer and technologist Reynald Adolphe explains the purpose and effective use of eight design patterns, including six Gang of Four design patterns and two .NET patterns. Gang of Four patterns fall under three categories: structural, creational, and behavioral. Reynald helps you learn about select patterns from each category. He describes each pattern and demonstrates how programmers can leverage them in real-world applications.
- Factory Method
- Abstract Factory
- Singleton pattern
- Decorator pattern
- Iterator pattern
- Observer pattern
- Repository pattern
- Unit of Work pattern
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome1m 28s
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1. Overview
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Design patterns explained1m 19s
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The need for design patterns1m 31s
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Design pattern categories1m 35s
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2. Factory Method
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Factory pattern overview1m 36s
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Code the Factory pattern4m 16s
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3. Abstract Factory
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4. Singleton Pattern
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Singleton pattern overview1m 44s
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Thread safety2m 42s
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5. Decorator Pattern
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Decorator pattern overview2m 54s
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Concrete Component code2m 37s
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Concrete Decorator code2m 42s
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6. Iterator Pattern
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Aggregate setup2m 7s
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Iterator setup and execution4m 53s
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7. Observer Pattern
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Observer pattern overview2m 22s
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Concrete Subject code3m 23s
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8. Repository Pattern
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MVC Project setup8m 14s
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Create a Generic Repository2m 29s
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9. Unit of Work Pattern
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Convert to Unit of Work3m 53s
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Conclusion
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Next Steps28s
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Video: Concrete Component code