Dot Net Design Patterns With Real-Time Examples

Design Patterns in C# With Real-Time Examples

Design Patterns in C# With Real-time Examples

In this article series, I discussed all the Design Patterns in C# with real-time examples using different types of dot net applications which include ASP.NET MVC, Web API, and Console Applications. It is very easy to understand and implement design patterns with real-time applications. Writing the code with design patterns will make your applications more Reliable, Scalable, and Maintainable.

For Whom?

These tutorials are designed for beginners as well as professional developers who want to learn Dot Net Design Patterns with Real-time Examples step by step from the very basics to the advanced concepts of many different types of Design Patterns in C# with real-time examples. This C# Design Patterns tutorial series provides a hands-on approach to the subject with step-by-step programming examples that will assist you to learn and put the acquired knowledge into practice.

History and Evolution of Design Patterns

The four authors of the book famously known as the Gang of four is the ones who brought the concepts of design patterns in their book “Elements of Reusable Object-Oriented Software”.

Gang of Four has divided the book into two parts with the first part explaining the pros and cons of object-oriented programming and the second part describing the evolution of 23 classic software design patterns.

What are Design Patterns?

Design Patterns are nothing but documented and tested solutions for recurring problems in a given context. So, in simple words, we can say that the Design Patterns are reusable solutions to the problems that a developer encounter in day-to-day programming. Design Patterns are basically used to solve the problems of object generation and integration. 

The Design Pattern is not a silver bullet. Let us understand what it means. While developing your project you know your project requirement better. We have many design patterns. Take the design pattern as a reference and see does the design pattern really solves your project problem. If yes, then only use the design pattern.

Do not overdo design patterns. One thing you need to remember is that the design patterns are for projects and projects are not for patterns. I saw many developers enforcing the design pattern in their projects which makes the project messy. So, use only when required.

Types of Design Patterns

Gang of Four categorized the Design Pattern into three main categories based on the three problem areas (object creation and initialization, Structural Changes of class and interfaces, and the relationship between classes, Communication between objects) of software architecture. They are as follows.

  1. Creational Design Pattern (object creation and initialization)
  2. Structural Design Pattern (Structural Changes of class and interfaces, and the relationship between classes)
  3. Behavioral Design Pattern (Communication Between Objects)
Creational Design Patterns:

The Creational Design Pattern deals with Object Creation and Initialization. The Creational Design Pattern gives the programmer more flexibility in deciding which objects need to be created for a given case. For example, if we have a huge project, a huge project means we have a lot of classes, and 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(), etc.) based on some conditions. 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. That means if the object creations and initialization logic are not centralized then it leads to a very complicated code. The Creational Design Pattern helps us to centralize the object creation logic and depending upon the condition, it will create and initialize the appropriate object and returns that object.

Examples of Creational design patterns are Singleton, Factory, Builder, Prototype, Fluent Interface, Factory Method, and Abstract Factory.

Structural Design Patterns: 

The Structural Design Pattern is basically used to manage the structure of classes and interface as well as manage the relationship between the classes. For example, if we have a Customer and Product class and the Product class is used inside the Customer class making one too many relationships. Tomorrow, as the project proceeds, now we want to keep away the product class from the Customer class as we want to use the Product and Customer class independently. This is a structural change and we don’t want this structural change to affect our project. This is where the Structural Design Pattern helps us.

Examples of Structural Design Patterns category: Adapter, Facade, Decorator, Composite, Proxy, Flyweight, and Bridge Design Pattern. 

Behavioral Design Patterns: 

The Behavioral Design Patterns deal with the communication between Classes and objects. That means if you want to change the behavior of a class again you want it to affect other classes of the project as well. For example, you have an Invoice class that currently applies taxes as 18%. Tomorrow if you have to add another extra tax. That means you are changing the behavior of a class. To solve such types of Behavioral issues Behavioral Design Pattern comes into the picture.

Examples of Behavioral design patterns: Chain of Responsibility, CommandObserver, Iterator, State, Template Method, Visitor, Strategy, Mediator, Memento, and Interpreter Design Pattern.

How easily you are going to understand the design patterns that basically depends on how strong you are in object-oriented programming concepts. So, to take full advantage of Design Patterns in C# tutorials, it is very important for you to have at least the basic knowledge of the following object-oriented programming concepts.

  1. Abstraction
  2. Inheritance
  3. Polymorphism
  4. Encapsulation
  5. Interfaces
  6. Classes
  7. Abstract classes
Along with GoF 23 Design Patterns, we are also going to discuss the following dot net design patterns which are used frequently in most real-time applications.
If you have any doubts or if you want to learn any design pattern which we missed in this course, then please give us a comment and we promised we will provide it as soon as possible.

Course Information

Course Instructor

Dot Net Tutorials Dot Net Tutorials Author

Creational Design Pattern

Structural Design Pattern

Behavioral Design Pattern

Dependency Injection Design Pattern

Repository Design Pattern

Inversion Of Control

Our Training Program

Popular Design Pattern Books

11 thoughts on “Design Patterns in C# With Real-Time Examples”

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    I think it would be better if we mention one flow like..
    1. oops
    2. Solid principles
    3. Design patterns
    If any new one come it’s like one guidance to them.
    Here we are all but there is no proper way.. It would help everyone to provide one structure..

  2. blank

    I learned lot of thing by reading your website and highly appreciated what you are doing for beginners.
    Can you please add microservice tutorial in c#?


  3. blank

    Please include WPF tutorials, ur website’s explaination is really good. Would want to learn WPF too . No proper sources to learn wpf .Please make it come true

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    I am a fresher. Facing lot of difficulty to understand the development of Web API in ASP.Net. I hope this site helps. There is lot of confusion on what concepts to cover for ASP.Net Web API.

    Please also provide tutorial on CQRS pattern. I didn’t find . If it is already available on this site, please share me the link. It would be of great help

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