Subdirectories - C# Programming Exercise

// Importing necessary namespaces
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Subdirectories
{
    // Main method where the program execution starts
    static void Main()
    {
        Console.WriteLine("Enter the directory path to scan:");
        string directoryPath = Console.ReadLine(); // Ask the user for the directory path

        if (!Directory.Exists(directoryPath))
        {
            Console.WriteLine("The directory does not exist. Please try again with a valid path.");
            return;
        }

        // Store files and subdirectories
        List filesList = GetFilesInDirectoryAndSubdirectories(directoryPath);

        // Loop for searching files by name
        while (true)
        {
            Console.WriteLine("\nEnter the text to search in file names (leave empty to exit):");
            string searchText = Console.ReadLine(); // Get the search text from user

            if (string.IsNullOrWhiteSpace(searchText))
            {
                Console.WriteLine("Exiting the program.");
                break; // Exit the program if the search string is empty
            }

            // Search for files that contain the search text in their names
            var matchedFiles = filesList.Where(f => f.Contains(searchText, StringComparison.OrdinalIgnoreCase)).ToList();

            // Display the matching files
            if (matchedFiles.Any())
            {
                Console.WriteLine("\nFiles containing the search text:");
                foreach (var file in matchedFiles)
                {
                    Console.WriteLine(file);
                }
            }
            else
            {
                Console.WriteLine("\nNo files found containing the search text.");
            }
        }
    }

    // Method to get all files from a directory and its subdirectories
    static List GetFilesInDirectoryAndSubdirectories(string path)
    {
        List files = new List();

        // Get all files in the current directory
        files.AddRange(Directory.GetFiles(path));

        // Get all subdirectories in the current directory
        var subdirectories = Directory.GetDirectories(path);

        // Recursively get files from subdirectories
        foreach (var subdir in subdirectories)
        {
            files.AddRange(GetFilesInDirectoryAndSubdirectories(subdir));
        }

        return files;
    }
}