Book Image

Hands-On Object-Oriented Programming with C#

By : Raihan Taher
Book Image

Hands-On Object-Oriented Programming with C#

By: Raihan Taher

Overview of this book

Object-oriented programming (OOP) is a programming paradigm organized around objects rather than actions, and data rather than logic. With the latest release of C#, you can look forward to new additions that improve object-oriented programming. This book will get you up to speed with OOP in C# in an engaging and interactive way. The book starts off by introducing you to C# language essentials and explaining OOP concepts through simple programs. You will then go on to learn how to use classes, interfacesm and properties to write pure OOP code in your applications. You will broaden your understanding of OOP further as you delve into some of the advanced features of the language, such as using events, delegates, and generics. Next, you will learn the secrets of writing good code by following design patterns and design principles. You'll also understand problem statements with their solutions and learn how to work with databases with the help of ADO.NET. Further on, you'll discover a chapter dedicated to the Git version control system. As you approach the conclusion, you'll be able to work through OOP-specific interview questions and understand how to tackle them. By the end of this book, you will have a good understanding of OOP with C# and be able to take your skills to the next level.
Table of Contents (16 chapters)

Default implementation of interface members

We all know that, in C#, interfaces don't have any method implementations; they only contain the method signature. In C# 8, however, interfaces are allowed to have implemented methods. These methods can be overridden by classes if they need to be. Interface methods will also have access to modifiers, such as public, virtual, protected, or internal. By default, the access level is set to virtual unless it is fixed as sealed or private.

There is another important thing to note. No attributes or fields are yet allowed in an interface. This means that interface methods can't use any instance fields in the methods. Interface methods can take parameters as input and use those, but not instance variables. Let's take a look at an example of an interface method:

using System;
namespace ConsoleApp7
{
class Program
{
static void...