C# Best Method to Calculate Total File Size on your video folder

[zackmark29]

Here's the best method that I'm always using.
I've tested many methods and this is the best.

//Convert bytes to file size format (e.g. 10MB/10GB)

public static string FormatFileSize(long bytes)
{
    var unit = 1024;
    if (bytes < unit) { return $"{bytes} B"; }
    var exp = (int)(Math.Log(bytes) / Math.Log(unit));
    return $"{bytes / Math.Pow(unit, exp):F2} {("KMGTPE")[exp - 1]}B";
}

//Get the total length or bytes of video files

public static long GetFolderSize(string path, string ext, bool AllDir)
{
    var option = AllDir ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
    return new DirectoryInfo(path).EnumerateFiles("*" + ext, option).Sum(file => file.Length);
}

//NOW HERE'S THE USAGE:

public static void TEST()
{
    var folder = @"C:\Users\Mark\Videos";
    var bytes = GetFolderSize(folder,"mp4", true); //all files or false if you want the current or single folder only
    var totalFileSize = FormatFileSize(bytes);
    Console.WriteLine(totalFileSize);
    //result: 14.94 GB
}