What are Design Patterns
Design patterns are solutions to recurring problems in object-oriented design. They provide a categorized and cataloged summary of code design experience that has been used over and over again and is known to most people.
The Role of Design Patterns
- Improve code reusability: By defining a standard set of solutions, design patterns enable the same or similar problems to reuse the same code structure or logic across different projects.
- Enhance code readability: Design patterns express complex code logic in a clear, concise way, making it easier for other developers to understand and maintain the code.
- Improve the maintainability of the system: the design pattern follows certain design principles, such as the principle of opening and closing, the principle of Richter's substitution, etc., which help to reduce the coupling of the various parts of the system and improve the scalability and maintainability of the system.
Design Patterns
Design patterns can be categorized into the following three main groups:
- Creational Patterns
- Structural Patterns
- Behavioral Patterns
Creational Patterns
Creative patterns focus on the process of creating objects. They provide an optimal way to create objects, rather than just using the new keyword directly. The benefits of this include increased code reuse, fewer dependencies, and simplification of the object creation process. Common creation patterns include:
- The singleton model (Singleton Pattern）
- Factory Method Pattern (FMP)
- Abstract Factory Pattern (Abstract Factory Pattern)
- Simple Factory Pattern (Simple Factory Pattern)
- Builder Pattern
- Prototype Pattern
Structural Patterns
Structural patterns focus on how to get a larger structure by combining classes or objects. They are commonly used to handle combinatorial relationships between classes or objects. Common structural patterns include:
- Adapter Pattern (Adapter Pattern)
- Bridge Pattern
- Composite Pattern
- Decorator Pattern
- Facade Pattern
- Flyweight Pattern
- Proxy Pattern
Behavioral Patterns
Behavioral patterns focus on communication between objects. They describe how classes or objects interact with each other and how responsibilities are assigned. Common behavioral patterns include:
- Strategy Pattern
- Template Method Pattern (TMP)
- Observer Pattern (OOP)
- Iterator Pattern
- State Pattern
- Command Pattern
- Chain of Responsibility Pattern (CRP)
- Mediator Pattern (Mediator Pattern)
- Memorandum Pattern (Memento Pattern)
- Visitor Pattern
C# implementation of the design pattern sample code
Design Patterns C# Edition (.NET 6), with a series of articles explaining them:
Recommended Study Books
The Zen of Design Patterns (2nd Edition), read online free at:/sstd521/design/193489
Project source code address
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