CS3014/04. Object Oriented Programming | Application Development Tools

To Apply OOP principles in C# with design patterns for robust software architecture.

Table of contents

Introduction

This lab covers Object-Oriented Programming (OOP) concepts in C#, including encapsulation, inheritance, polymorphism, and abstraction [1].

Environment Setup

• VS Code with C# Dev Kit Extension
• .NET SDK (Latest Stable Version)
• Terminal/Command Prompt

File Structure

OOPLab/  
│── Program.cs  
│── Models/  
│   ├── Person.cs  
│   ├── Employee.cs  
│── OOPLab.csproj  

Steps

1. Create a New C# Console App

Open VS Code, then run:

dotnet new console -o OOPLab
cd OOPLab
code .

2. Implement Encapsulation (Models/Person.cs)

namespace OOPLab.Models;
public class Person  
{  
    private string name;  

    public string Name  
    {  
        get { return name; }  
        set { name = value.Length > 0 ? value : "Unknown"; }  
    }  

    public Person(string name) => Name = name;  
    public void Display() => Console.WriteLine($"Name: {Name}");  
}

3. Implement Inheritance (Models/Employee.cs)

namespace OOPLab.Models;
public class Employee : Person  
{  
    public string Role { get; set; }  

    public Employee(string name, string role) : base(name) => Role = role;  

    public void ShowDetails() => Console.WriteLine($"Name: {Name}, Role: {Role}");  
}

4. Implement Polymorphism (Program.cs)

using OOPLab.Models;

class Program  
{  
    static void Main()  
    {  
        Person p = new Person("Alice");  
        p.Display();  

        Employee e = new Employee("Bob", "Developer");  
        e.ShowDetails();  

        // Polymorphism: Using base class reference
        Person poly = new Employee("Charlie", "Manager");  
        ((Employee)poly).ShowDetails();  
    }  
}

5. Run the Application

dotnet run

Additional Scopes

• Implement abstract classes and interfaces.
• Add method overriding and operator overloading.
• Use collections (List, Dictionary) with OOP.

References

[1] Microsoft Docs: C# OOP Fundamentals.
[2] .NET CLI Guide for Console Apps.