Зміст курсу

C# Beyond Basics

1. Additional Structures & File Handling

What are Lists?Practicing List Declaration List Methods What are Dictionaries?Practicing Dictionaries Reading Files using StreamReader Reading Files using File Methods Writing Files Error Handling Practicing Error Handling

2. Structs & Enumerators

What are Structs?Defining & Using a Structure Practicing Structs Structs with Other Data Structures Struct Methods Correctly Accessing Fields in Struct Methods Practicing Methods Struct Constructors Practicing Constructors Enumerators Practicing Enumerator

3. Introduction to Object-Oriented Programming (OOP)

What is Object-Oriented Programming?Defining Classes Practice: Creating Classes Class Objects Class Objects vs Struct Objects Practice: Objects Class Methods Practice: Methods Class Constructors Practice: Constructors

4. OOP Essentials

Derived Classes Derived Classes Practice Common Access Modifiers Access Modifiers Practice The `static` Keyword Practicing `static` Keyword Method Overloading Method Overloading Practice

5. OOP Principles

What are the Principles of OOP?Inheritance Practicing Inheritance Polymorphism Practicing Polymorphism Encapsulation Encapsulation Practice Abstraction Abstraction Practice What's Next?

C# Beyond Basics

Derived Classes

When we say a class is derived from another class, it means that it has all the fields and methods of the parent class and in addition to it, the derived class can contain additional fields and methods as well.

A derived class (also called a child class) is a class which inherits the properties of some other class while on the contrary, a base class (also called a parent class) is a class which is inherited from.

The syntax for making an inherited class is the following:

index.cs

Here's an example with some concrete code:

index.cs

In this example, Dog is the derived class, inheriting from the Animal base class. The Dog class has access to the Name property and the Eat method from the Animal class. Additionally, it introduces a new method, Bark, which is specific to the Dog class.

As illustrated in the diagram, there can be cases where a class inherits from a class which is already a class from some other:

index.cs

In such a case, the class at the top-most level is called the Super Class. In this case Animal is the super class. Such a case where where there are multiple levels of inheritence is called Multi-Level Inheritence.

In some languages it allows a class to inherit from multiple base classes, such an inheritance is called Multiple Inheritance. In C#, a class can have only one parent class so Multiple Inheritance is not possible in C#.

1. In C#, which keyword or symbol is used to declare a derived class?

2. In Multi-Level inheritance, what is the class at the top called?

3. Is Multilevel inheritance possible in C#?