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DanWahlinDanWahlin
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Add JS and C# samples
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‎.gitignore‎

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*.pyc
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*.pyo
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# .NET
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bin/
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obj/
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*.user
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*.suo
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# Testing
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coverage/
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.nyc_output/

‎samples/book-app-project-cs/BookApp.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net10.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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<DefaultItemExcludes>$(DefaultItemExcludes);Tests/**</DefaultItemExcludes>
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</PropertyGroup>
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<ItemGroup>
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<None Update="data.json">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>

‎samples/book-app-project-cs/Models/Book.cs‎

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namespace BookApp.Models;
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public class Book
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{
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public string Title { get; set; } = string.Empty;
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public string Author { get; set; } = string.Empty;
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public int Year { get; set; }
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public bool Read { get; set; }
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}

‎samples/book-app-project-cs/Program.cs‎

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using BookApp.Models;
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using BookApp.Services;
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var collection = new BookCollection();
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void ShowBooks(List<Book> books)
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{
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if (books.Count == 0)
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{
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Console.WriteLine("No books found.");
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return;
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}
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Console.WriteLine("\nYour Book Collection:\n");
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for (int i = 0; i < books.Count; i++)
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{
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var book = books[i];
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var status = book.Read ? "✓" : " ";
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Console.WriteLine($"{i + 1}. [{status}] {book.Title} by {book.Author} ({book.Year})");
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}
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Console.WriteLine();
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}
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void HandleList()
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{
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var books = collection.ListBooks();
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ShowBooks(books);
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}
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void HandleAdd()
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{
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Console.WriteLine("\nAdd a New Book\n");
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Console.Write("Title: ");
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var title = Console.ReadLine()?.Trim() ?? "";
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Console.Write("Author: ");
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var author = Console.ReadLine()?.Trim() ?? "";
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Console.Write("Year: ");
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var yearStr = Console.ReadLine()?.Trim() ?? "";
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if (int.TryParse(yearStr, out var year))
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{
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collection.AddBook(title, author, year);
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Console.WriteLine("\nBook added successfully.\n");
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}
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else
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{
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Console.WriteLine($"\nError: '{yearStr}' is not a valid year.\n");
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}
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}
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void HandleRemove()
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{
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Console.WriteLine("\nRemove a Book\n");
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Console.Write("Enter the title of the book to remove: ");
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var title = Console.ReadLine()?.Trim() ?? "";
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collection.RemoveBook(title);
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Console.WriteLine("\nBook removed if it existed.\n");
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}
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void HandleFind()
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{
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Console.WriteLine("\nFind Books by Author\n");
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Console.Write("Author name: ");
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var author = Console.ReadLine()?.Trim() ?? "";
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var books = collection.FindByAuthor(author);
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ShowBooks(books);
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}
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void ShowHelp()
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{
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Console.WriteLine("""
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Book Collection Helper
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Commands:
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list - Show all books
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add - Add a new book
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remove - Remove a book by title
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find - Find books by author
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help - Show this help message
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""");
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}
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if (args.Length == 0)
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{
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ShowHelp();
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return;
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}
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var command = args[0].ToLower();
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switch (command)
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{
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case "list":
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HandleList();
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break;
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case "add":
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HandleAdd();
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break;
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case "remove":
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HandleRemove();
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break;
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case "find":
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HandleFind();
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break;
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case "help":
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ShowHelp();
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break;
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default:
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Console.WriteLine("Unknown command.\n");
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ShowHelp();
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break;
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}

‎samples/book-app-project-cs/README.md‎

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# Book Collection App
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*(This README is intentionally rough so you can improve it with GitHub Copilot CLI)*
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A C# console app for managing books you have or want to read.
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It can add, remove, and list books. Also mark them as read.
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---
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## Current Features
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* Reads books from a JSON file (our database)
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* Input checking is weak in some areas
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* Some tests exist but probably not enough
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---
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## Files
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* `Program.cs` - Main CLI entry point
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* `Models/Book.cs` - Book model class
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* `Services/BookCollection.cs` - BookCollection class with data logic
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* `data.json` - Sample book data
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* `Tests/BookCollectionTests.cs` - xUnit tests
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---
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## Running the App
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```bash
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dotnet run -- list
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dotnet run -- add
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dotnet run -- find
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dotnet run -- remove
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dotnet run -- help
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```
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## Running Tests
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```bash
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cd Tests
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dotnet test
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```
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---
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## Notes
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* Not production-ready (obviously)
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* Some code could be improved
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* Could add more commands later

‎samples/book-app-project-cs/Services/BookCollection.cs‎

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using System.Text.Json;
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using BookApp.Models;
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namespace BookApp.Services;
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public class BookCollection
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{
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private readonly string _dataFile;
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private List<Book> _books = [];
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private static readonly JsonSerializerOptions JsonOptions = new()
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{
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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WriteIndented = true
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};
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public BookCollection(string? dataFile = null)
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{
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_dataFile = dataFile ?? Path.Combine(AppContext.BaseDirectory, "data.json");
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LoadBooks();
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}
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public IReadOnlyList<Book> Books => _books;
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private void LoadBooks()
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{
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try
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{
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var json = File.ReadAllText(_dataFile);
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_books = JsonSerializer.Deserialize<List<Book>>(json, JsonOptions) ?? [];
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}
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catch (FileNotFoundException)
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{
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_books = [];
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}
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catch (JsonException)
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{
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Console.WriteLine("Warning: data.json is corrupted. Starting with empty collection.");
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_books = [];
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}
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}
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private void SaveBooks()
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{
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var json = JsonSerializer.Serialize(_books, JsonOptions);
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File.WriteAllText(_dataFile, json);
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}
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public Book AddBook(string title, string author, int year)
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{
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var book = new Book { Title = title, Author = author, Year = year };
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_books.Add(book);
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SaveBooks();
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return book;
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}
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public List<Book> ListBooks() => _books;
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public Book? FindBookByTitle(string title)
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{
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return _books.Find(b => b.Title.Equals(title, StringComparison.OrdinalIgnoreCase));
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}
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public bool MarkAsRead(string title)
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{
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var book = FindBookByTitle(title);
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if (book is null) return false;
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book.Read = true;
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SaveBooks();
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return true;
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}
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public bool RemoveBook(string title)
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{
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var book = FindBookByTitle(title);
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if (book is null) return false;
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_books.Remove(book);
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SaveBooks();
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return true;
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}
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public List<Book> FindByAuthor(string author)
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{
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return _books
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.Where(b => b.Author.Equals(author, StringComparison.OrdinalIgnoreCase))
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.ToList();
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}
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}

‎samples/book-app-project-cs/Tests/BookApp.Tests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net10.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" Version="6.0.4" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
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<PackageReference Include="xunit" Version="2.9.3" />
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<PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
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</ItemGroup>
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<ItemGroup>
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<Using Include="Xunit" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\BookApp.csproj" />
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</ItemGroup>
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</Project>

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