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All posts in "C#"

Web scraping in C# using HtmlAgilityPack

Published October 16, 2022 in .NET , .NET core , C# - 0 Comments

In this post, I show an example of scraping data in C# using HtmlAgilityPack. I come across HtmlAgilityPack because I need to get data from Zillow to analyze properties deals. I was able to scrape the data I want without much trouble using HtmlAgilityPack with a bit of XPath, LINQ and regular expression.

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Notes on the three programming paradigms

Published January 30, 2022 in Architecture , C# , Java , Object Oriented Programming - 0 Comments

In this post, I summarize the different programming paradigms which I learned from reading the book “Clean Architecture A Craftsman’s guide to Software Structure and Design” by Robert Martin. The programming paradigms are structured programming, object oriented programming and functional programming.

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More on inheritance

Inheritance is something that comes up quite often during my programming experience. Whenever I have classes that share some logic or properties, I think of inheritance. However, sometimes, using inheritance ends up making a design more brittle. Through my experience and reading, I have learned a few things about inheritance.

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The Liskov Substitution Principle

Published June 26, 2021 in Architecture , C# , Design Patterns - 0 Comments

In the previous post, I wrote about Barbara Liskov research paper on data abstraction and hierarchy. In the paper, the author states a property which exists between type and subtype. That property later becomes known as the Liskov Substitution Principle. In this post, I continue to go over the principle in more details and give examples. The principle is one out of the five software design principles in SOLID:

  • S: Single Responsibility Principle
  • O: Open Closed Principle
  • L: Liskov Substitution Principle
  • I: Interface Segregation Principle
  • D: Dependency Inversion Principle
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