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Liskov Substitution Principle in C#: Explained Simply

Understanding the Liskov Substitution Principle in C#: A Simple Guide

Yohan Malshika
5 min readDec 9, 2024
Liskov Substitution Principle in C#: Explained Simply

The Liskov Substitution Principle (LSP) is one of the five SOLID principles. It provides a foundation for writing clean, maintainable, and scalable object-oriented code. Following these principles ensures that your code is easier to work with, extend, and understand, leading to more robust and reliable applications. Let’s discuss the Liskov substitution principle with C# examples in this article.

What is the Liskov Substitution Principle?

The Liskov Substitution Principle (LSP) was introduced by computer scientist Barbara Liskov and can be summarized as:

“Objects of a base class should be replaceable with objects of its derived class without altering the behavior of the program.”

In simpler terms, if you have code that works with a base class, it should also work seamlessly with any derived class, without requiring knowledge of the derived class’s specifics.

The principle ensures that inheritance is applied correctly. If a derived class does not fulfill the expectations of its base class, it can introduce unexpected errors and violate the LSP. This often results in code that is…

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Yohan Malshika
Yohan Malshika

Written by Yohan Malshika

Software Engineer | .Net Developer | Technical Writer

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