Creational Design Pattern in C#
In this article, I am going to give a brief introduction to the Creational Design Pattern in C#. As part of this article, we will discuss the following three important things.
What is the Creational Design Pattern in C#?
According to Wikipedia, in software engineering, Creational Design Patterns are design patterns that deal with object creation mechanisms, i.e., trying to create objects that suit a given situation. In simple words, we can say that the Creational Design Pattern deals with Object Creation and Initialization. This Design Pattern gives the programmer more flexibility in deciding which objects need to be created for a given situation.
A Creational Design Pattern focuses on object creation in software development. Instead of creating objects directly using the new operator (or its equivalent in other languages), these patterns provide alternative mechanisms to create objects. By abstracting the object instantiation process, creational patterns make a system independent of how objects are created, composed, and represented.
The Creational Design Patterns are categorized into two types. They are as follows:
- Object-Creational Patterns: Object-Creational Patterns deal with object creation. Here, it defers part of its object creation to another object.
- Class-Creational Patterns: Class-Creational Patterns deal with class instantiation. Here, it defers its object creation to subclasses.
When to use the Creational Design Pattern in Real-Time Applications?
In Real-Time Applications, the project is created with a lot of classes. A lot of classes mean we are dealing with a lot of objects. So we need to create different objects (like new Customer(), new Product(), new Invoice(), new Payment(), etc.) for an E-Commerce Application. If the object creation logic based on some condition is implemented in the client code, then it leads to lots of complicated logic in the client code. Client code means the class that will consume the Customer Object, Product Object, Invoice Object, etc., by calling the methods and properties of such objects.
That means if the object creation and initialization logic are not centralized, it leads to a complicated client code. The Creational Design Pattern helps us to centralize the object creation and initialization logic, and depending upon the condition, it will create, initialize, and return the appropriate object to the client. Then, the client can consume the object by calling the necessary methods and properties. If this is unclear now, don’t worry; you will understand this concept once we start discussing the Creational Design Patterns.
Creational patterns provide the following benefits:
- Flexibility: By encapsulating object creation, you can easily change or upgrade the instantiated objects without affecting existing code.
- Code Reusability: Centralized object creation reduces redundancy and potential errors.
- Abstraction: The system does not need to know the specific classes to be instantiated.
Examples of Creational Design Patterns in C#
Creational design patterns address concerns related to object creation. Knowing when to use them can lead to more flexible, maintainable, and scalable code. Here’s a guide on when to consider each of the primary Creational Design Patterns in C#:
Singleton Design Pattern:
Singleton Design Pattern Ensures that a class has only one instance and provides a global point of access to that instance. This pattern is useful for situations where exactly one object is needed to coordinate actions across the system. Example Scenario: Database connections, Logger services, Configuration managers.
Factory Method Design Pattern:
Factory Method Design Pattern Provides an interface for creating instances of a class. Subclasses decide which class to instantiate, promoting flexibility in assigning responsibility for object creation to derived classes. Example Scenario: GUI libraries where each OS provides different implementations of a button or window, Payment gateway integration where each provider has a different implementation.
Abstract Factory Design Pattern:
Abstract Factory Design Pattern Allows the creation of objects without specifying the exact class to instantiate. Typically, the pattern uses factory methods to do the instantiation and can deliver families of related objects. Example Scenario: UI themes where each theme provides consistent visuals like buttons, panels, and windows or creates product sets in different regions with varying specifications.
Prototype Design Pattern:
Prototype Design Pattern Creates objects by copying an existing object, known as the prototype. This pattern is especially useful when object creation is more expensive than cloning or when objects have numerous shared configurations and only a few differences. Example Scenario: Generating detailed configuration objects with slight variations, Spawning game entities with minor differences from a prototype.
Builder Design Pattern:
Builder Design Pattern Separates the construction of a complex object from its representation, enabling the same construction process to produce different representations. The pattern often involves a director, who specifies the building steps, and several builders implement these steps for different representations. Example Scenario: Building a meal with multiple courses, Constructing complex documents or file formats with various components.
In the next article, I will discuss the Factory Design Pattern in C# with Real-Time Examples. Here, in this article, I try to give a brief introduction to the Creational Design Pattern. I hope you understand the need and use of the Creational Design Pattern in C#.
About the Author: Pranaya Rout
Pranaya Rout has published more than 3,000 articles in his 11-year career. Pranaya Rout has very good experience with Microsoft Technologies, Including C#, VB, ASP.NET MVC, ASP.NET Web API, EF, EF Core, ADO.NET, LINQ, SQL Server, MYSQL, Oracle, ASP.NET Core, Cloud Computing, Microservices, Design Patterns and still learning new technologies.