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Home Interviews How do you calculate the total size of all files in a directory (including subdirectories)? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 13 May 2025
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To calculate the total size of all files in a directory, including all subdirectories, you can use DirectoryInfo and recursively enumerate files using EnumerateFiles() with the SearchOption.AllDirectories option.

Example: Calculate total size (in bytes)

using System;
using System.IO;
using System.Linq;

class Program
{
    static void Main()
    {
        string path = @"C:\MyFolder";
        long totalSize = GetDirectorySize(path);

        Console.WriteLine($"Total size: {totalSize} bytes");
        Console.WriteLine($"Total size: {totalSize / 1024.0 / 1024.0:F2} MB");
    }

    static long GetDirectorySize(string folderPath)
    {
        if (!Directory.Exists(folderPath))
            return 0;

        return Directory.EnumerateFiles(folderPath, "*", SearchOption.AllDirectories)
                        .Select(f => new FileInfo(f))
                        .Sum(fi => fi.Length);
    }
}

Notes:

  1. Directory.EnumerateFiles(...) is memory-efficient compared to GetFiles(...) because it streams results.
  2. This method handles deep nested folders and hidden files.
  3. If you want to ignore certain file types, you can filter them with .Where(...).

Optional: Handle exceptions (e.g., permission errors)

Wrap file access in try-catch if you expect restricted folders:

long safeSize = 0;
foreach (var file in Directory.EnumerateFiles(path, "*", SearchOption.AllDirectories))
{
    try
    {
        safeSize += new FileInfo(file).Length;
    }
    catch { /* Ignore inaccessible files */ }
}
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