Design pattern in C# provides the standard, reusability of code and efficient solution for common software design problems that software development teams face several times in daily coding practices. Design patterns display relationships and communication between the objects or classes. The purpose is to speed up the development process by providing cautiously tested and proven design paradigm. By using the design pattern, the development team makes code reusable, flexible and maintainable code. This a programming language that represents an idea rather than the implementation. Though this is not mandatory but this is useful for solving common problems. Generally, this is followed in many custom .NET Application development companies for effortless development.
Design patterns allow developers to interact using well understandable and known names for software interactions. Common design patterns can be enhanced over time, making them more reliable than ad-hoc designs.
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When to use Design patterns
One can introduce this design pattern in the project when:
- We have distinct variations for some functionality in an object and they need to switch from one variation to another in a runtime.
- There are similar classes in the project that only differ on how they execute some behaviours, this design strategy pattern should be the right choice.
- In a single class there are multiple conditions over distinct variations of similar functionality.
Types of Design Patterns
There are categorized into three different parts which are creational, structural and behavioural design patterns
1. Creational Design Pattern
Creational design patterns are concerned with the object creation mechanism or class instantiation. These design patterns instability and complexities by creating objects in a controlled manner. When a new operator is often considered unfavourable as it scatters objects all over the application. Over time it can become difficult to change an implementation because classes become tightly coupled.
This issue can be resolved by decoupling the client entirely from the real initialization process.
Creational Design patterns can be further divided into two categories i.e.-
- Object-creational patterns
- Class-creational patterns
In the instantiation process, while the class-creation patterns use inheritance effectively, object-creation patterns use delegation efficiently to get the job done.
Creational design patterns are the Factory Method, Builder, Abstract Factory Object Pool, Prototype and Singleton.
2. Structural Design Pattern
Structural design patterns are the patterns that describe the object and class composition. This means that how classes and objects can be united and form a structure that simplifies the design by identifying the common way to find the relationship between the entities. Structural class-creation patterns utilize inheritance to compose interfaces. However, structural object-patterns define ways to form objects to obtain new functionality. These patterns are concerned with the structure of objects and classes.
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3. Behavioural Design Pattern
These design patterns are all about Class object interaction. Behavioural design patterns are those patterns which are exclusively concerned with the interaction between objects. By doing so, these patterns enhance flexibility in carrying out the interactions between these objects.
A Behavioural design pattern is concerned with the assignment of relationships between objects, or, encapsulating behaviour in an object and assigning requests to these objects.
Some of the useful design patterns in C# are listed below:
- Builder Design Pattern and Fluent Builder
- Fluent Builder Interface with Recursive Generics
- Faceted Builder
- Factory Method
Implementing the design pattern is essential as it makes the code more readable, simple and easy to maintain. However, it requires an implementation of some additional classes in the project development.