Record structs in C Sharp (C#) - Mini Project: Build & Apply

Working with Record Structs in C#

📖 Scenario: You are building a simple program to store information about books in a library. Each book has a title and a number of pages.

🎯 Goal: Create a record struct called Book to hold the title and pages of a book. Then create a list of books, filter books with more than 300 pages, and print their titles.

📋 What You'll Learn

Create a record struct named Book with two properties: string Title and int Pages

Create a list of Book instances with exact titles and pages

Create a variable pageThreshold set to 300

Use a foreach loop to find books with pages greater than pageThreshold

Print the titles of the filtered books

💡 Why This Matters

🌍 Real World

Record structs are useful for storing small, immutable data like coordinates, settings, or simple records in applications such as libraries, games, or data processing.

💼 Career

Understanding record structs helps you write clean, efficient C# code for data storage and manipulation, a common task in software development jobs.

1

Create the Book record struct and list of books

Create a record struct named Book with two properties: string Title and int Pages. Then create a list called books with these exact entries: new Book("C# Basics", 250), new Book("Advanced C#", 400), new Book("LINQ in Action", 320).

C Sharp (C#)

// Your code here

Need a hint?

Use the syntax public record struct Book(string Title, int Pages); to create the record struct. Then create a List<Book> with the given books.

2

Add a page threshold variable

Create an int variable called pageThreshold and set it to 300.

C Sharp (C#)

public record struct Book(string Title, int Pages);

var books = new List
{
    new Book("C# Basics", 250),
    new Book("Advanced C#", 400),
    new Book("LINQ in Action", 320)
};

// Your code here

Need a hint?

Simply write int pageThreshold = 300; below the list of books.

3

Filter books with pages greater than the threshold

Create a List<Book> called filteredBooks. Use a foreach loop with variables book to iterate over books. Inside the loop, add book to filteredBooks if book.Pages is greater than pageThreshold.

C Sharp (C#)

public record struct Book(string Title, int Pages);

var books = new List
{
    new Book("C# Basics", 250),
    new Book("Advanced C#", 400),
    new Book("LINQ in Action", 320)
};

int pageThreshold = 300;

// Your code here

Need a hint?

Create an empty list filteredBooks. Then use a foreach loop to check each book's pages and add it to filteredBooks if it has more pages than pageThreshold.

4

Print the titles of filtered books

Use a foreach loop with variable book to iterate over filteredBooks. Inside the loop, print the book.Title using Console.WriteLine.

C Sharp (C#)

public record struct Book(string Title, int Pages);

var books = new List
{
    new Book("C# Basics", 250),
    new Book("Advanced C#", 400),
    new Book("LINQ in Action", 320)
};

int pageThreshold = 300;

var filteredBooks = new List();
foreach (var book in books)
{
    if (book.Pages > pageThreshold)
    {
        filteredBooks.Add(book);
    }
}

// Your code here

Need a hint?

Use a foreach loop to print each book.Title from filteredBooks with Console.WriteLine(book.Title);.