How to get human-readable file size in bytes abbreviation using C#?

To get the directory, C# provides the Directory.GetDirectories method

Directory.GetDirectories returns the name of the subdirectory (including its path) in the specified directory that matches the specified search pattern ), and optionally search subdirectories

To obtain files, C# provides the Directory.GetFiles method

Directory.GetFiles returns the names (including their paths) of all files matching the specified search pattern , and can optionally search subdirectories

In order to obtain the file length, C# provides a property Length

Example

static void Main(string[] args) {
   string rootPath = @"C:\Users\Koushik\Desktop\TestFolder";
   var files = Directory.GetFiles(rootPath, "*.*", SearchOption.AllDirectories);

   foreach (string file in files) {
      long size = new FileInfo(file).Length / 1024;
      string humanKBSize = string.Format("{0} KB", size);
      string humanMBSize = string.Format("{0} MB", size / 1024);
      string humanGBSize = string.Format("{0} GB", size / 1024 / 1024);
      Console.WriteLine($"KB:{humanKBSize} MB:{humanMBSize} GB:{humanGBSize}");
   }
   Console.ReadLine();
}

Output

file C:\Users\Koushik\Desktop\TestFolder\Topdirectory.txt 22 KB 0 MB 0 GB
file C:\Users\Koushik\Desktop\TestFolder\TestFolderMain\TestFolderMain.txt 0 KB 2 MB 0 GB
file C:\Users\Koushik\Desktop\TestFolder\TestFolderMain1\TestFolderMain1.txt 0 KB 0 MB 1 GB
file C:\Users\Koushik\Desktop\TestFolder\TestFolderMain2\TestFolderMain1.txt 0 KB 0 MB 1 GB
file C:\Users\Koushik\Desktop\TestFolder\TestFolderMain2\TestFolderMain2.txt 0 KB 0 MB 1 GB
file C:\Users\Koushik\Desktop\TestFolder\TestFolderMain2\TestFolderMainSubDirectory\TestFolderSubDirectory.txt 0 KB 0 MB 1 GB

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