C# Beyond Basics

1. Additional Structures & File Handling

In this section we will learn data structures like Lists and Dictionaries. We will also learn how to read and write files. In the end we will look at how to deal with unexpected errors which can occur during the program's execution.

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

In this section we will learn about some more advanced structures for storing data, namely Structs and Enumerators. We will learn how to use them and we will look at some practice examples as well.

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)

In this section, we will learn what Object-Oriented Programming (OOP) is and how we can create programs that use the concept of OOP. We will also practice this concept with many hands-on tasks that are fun to solve.

What is Object-Oriented Programming?

Defining Classes

Practice: Creating Classes

Class Objects

Class Objects vs Struct Objects

Practice: Constructors

4. OOP Essentials

In this section, we delve deeper into the essentials of Object-Oriented Programming (OOP). We explore advanced topics to enhance your understanding and proficiency in OOP. From managing object lifecycles through destructors to refining class structures with access modifiers, and harnessing the power of derived classes and method overloading, this section equips you with the knowledge and practical skills needed to design robust and flexible object-oriented systems.

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

This will be a detailed chapter in which we will dive deep into the main principles of Object-Oriented Programming (OOP). We will also look at many practical applications and hands-on examples of these principles to understand them better. In this section we will revise some of the concepts from the previous section in a bit more detail and combine the concepts together to understand it more thoroughly.

What are the Principles of OOP?

Inheritance

Practicing Inheritance

Polymorphism

Practicing Polymorphism

Encapsulation

Encapsulation Practice

Abstraction

Abstraction Practice

What's Next?

Course Content

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?

Writing Files

For writing text in a file we create a StreamWriter object with the path of the file, similar to how we create a StreamReader object.

Note
The platform currently doesn't support file writing so this can be practiced on a compiler on your PC.

The StreamWriter object offers a WriteLine method which can write text into a file. We will now try to write something to the text.txt file.

index


              12345
            
var textFile = new StreamWriter("C:/Users/Admin/Desktop/text.txt");
textFile.WriteLine("This is some new text.");
textFile.WriteLine("This is the next line.");
textFile.WriteLine("Another line.");
textFile.Close();

The above code will overwrite the previous content of the text.txt file and replace it with:

StreamWriter has a second parameter called "append" which takes in a boolean value and is set to false by default. If we set the append parameter to true then the code will not overwrite the older text rather it would append the new text to the end of the file.

For-example, consider the file text.txt has the following text in it:

text


              123
            
First line
Second line
Third line

We will use the following code to add a new line to it:

index


              123456789101112
            
using System;
using System.IO;

public class HelloWorld
{
    public static void Main(string[] args)
    {
        var textFile = new StreamWriter("C:/Users/Admin/Desktop/text.txt", true);
        textFile.WriteLine("This is a new line.");
        textFile.Close();
    }
}

The file will look like this after running the code:

text


              1234
            
First line
Second line
Third line
This is a new line.

Everything was clear?

Section 1. Chapter 8