In this part of the SOLID series, we're going to revisit the ISP or Interface Segregation Principle. Yep, this is a very long article. If you want an easier way of learning SOLID principles in depth, then I would recommend you taking my SOLID tutorial just for 10.99$. Interface Segregation Principle Definition Before giving a definition, I want to [...]
LSP Definition The official definition from Barbara Liskov sounds like this: “If S is a subtype of T, then objects of type T may be replaced with objects of type S, without breaking the program” – B. Liskov. It’s not very hard to grasp what this definition means but I’ll quote the definition of LSP from the book of Uncle Bob “Agile Principles, [...]
The second principle we’re going to talk about is the Open/Closed Principle. If we look at Wikipedia, we will see the following definition: The Open/Closed Principle states that software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification. Problem Statement What it means, in essence, is that when we need to introduce a change, we shouldn’t dig deep into [...]
SRP Definition In this article, we will look at what is single responsibility principle and look at some simple examples in C# which demonstrate the single responsibility principle and how to adhere to the SRP. Single Responsibility Principles or SRP in short states that every object should have a single [...]
IntroBefore investigating what the SOLID principles are and how to apply them properly, we need to understand why do we need them at all? SOLID principles are all about designing software. But what is design? How to define the design of software? […]
Learn how to develop maintainable software systems applying Meta and SOLID Principles. Teaching Approach No fluff, no ranting, no beating the air. I esteem your time. The course material is succinct, yet comprehensive. All important concepts are covered. Particularly important topics are covered in-depth. For absolute beginners, I offer my [...]
You can open any C# tutorial and you’ll find some information about abstract classes and interfaces. Most likely, you’ll not find any information about what is the difference between abstract class and interface. This theme was discussed earlier on the Internet several times but I want to consolidate all the most important thoughts regarding the problem of choosing between an abstract class and interface [...]
Nowadays I’m writing my new programming video course. I chose an interesting topic for the next course: “Designing and Implementing API in C#”. How to design API? In this course, you’ll learn how to design and implement types in C# so that the other developers won’t hate you when using one of the types developed by you. It means you are going to learn [...]
Very often we can see that developers tend to use static message buses for all kind of interactions between objects. For those, who unaware of this pattern I want to recall that this pattern allows organizing loosely coupled communication channel between objects which don’t want (or can’t) to know each other. Let’s have a brief look at how a regular example of using this [...]
Primitive Types Obsession Problem Today I’m going to discuss the problem of using primitive types instead of abstractions. This problem was discussed in the blog of Mark Seemann. Read it, if you haven’t read it yet. In this post I’m going to talk about Money type as an abstraction instead of using decimal type for representing money-values. In the last project I’ve been participating [...]