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Home Interviews How can you list all files in a directory, including subdirectories? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 06 May 2025
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To list all files in a directory, including its subdirectories, you can use the Directory.GetFiles method with the SearchOption.AllDirectories option in C#.

Example: Get all files recursively

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string rootPath = @"C:\MyFolder";

        try
        {
            string[] allFiles = Directory.GetFiles(rootPath, "*.*", SearchOption.AllDirectories);

            foreach (string file in allFiles)
            {
                Console.WriteLine(file);
            }
        }
        catch (UnauthorizedAccessException ex)
        {
            Console.WriteLine("Access denied: " + ex.Message);
        }
        catch (DirectoryNotFoundException ex)
        {
            Console.WriteLine("Directory not found: " + ex.Message);
        }
    }
}

Parameters:

  1. *.* – Matches all files.
  2. SearchOption.AllDirectories – Tells the method to search recursively.
  3. You can filter by extension too, e.g., "*.txt".

Notes:

  1. Wrap in a try-catch block to handle access issues.
  2. Be cautious with very large directory trees—it can be slow or memory-intensive.
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