C# / .NET - convert size in bytes to KB, MB, GB, TB, PB

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using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
// ---------------------------------------------------
//      Practical example 1:
//        Used pre-default SHORT_UNITS units.
// ---------------------------------------------------

        Dictionary<string, long?> parts = SizeUtils.calculateParts(31108834345654325);

        Console.WriteLine(parts["PB"] + "PB " + parts["TB"] + "TB " + parts["GB"] + "GB " + parts["MB"] + "MB " + parts["KB"] + "KB " + parts["B"] + "B");

        // Output:
        //
        //     27PB 645TB 327GB 712MB 806KB 52B



// ---------------------------------------------------
//      Practical example 2:
//        Used only 2 units: B and KB.
// ---------------------------------------------------

        Console.WriteLine(SizeUtils.renderSize(1234567890, new string[] { "B", "KB"}));  // 1177KB 722B


        // Output:
        //
        //     1177KB 722B



// ---------------------------------------------------
//      Practical example 3:
//        Used pre-default SHORT_UNITS units.
// ---------------------------------------------------

        Console.WriteLine(SizeUtils.renderSize(0));                  // 0B
        Console.WriteLine(SizeUtils.renderSize(10));                 // 10B
        Console.WriteLine(SizeUtils.renderSize(10240));              // 10KB
        Console.WriteLine(SizeUtils.renderSize(10485760));           // 10MB
        Console.WriteLine(SizeUtils.renderSize(10737418240));        // 10GB
        Console.WriteLine(SizeUtils.renderSize(10995116277760));     // 10TB
        Console.WriteLine(SizeUtils.renderSize(31108834345654325));  // 27PB 645TB 327GB 712MB 806KB 52B

        //                                                                         ... 645-TB ...
        //                                                                                |
        //                                                                                v
        Console.WriteLine(SizeUtils.renderSize(31108834345654325, SizeUtils.SHORT_UNITS, "-", " "));  // 27-PB 645-TB 327-GB 712-MB 806-KB 52-B
        //                                                                                     ^
        //                                                                                     |
        //                                                                           ... 645-TB 327-GB ...


        // Output:
        //
        //     0B
        //     10B
        //     10KB
        //     10MB
        //     10GB
        //     10TB
        //     27PB 645TB 327GB 712MB 806KB 52B
        //     27-PB 645-TB 327-GB 712-MB 806-KB 52-B



// ---------------------------------------------------
//      Practical example 4:
//        Used pre-default FULL_UNITS units with separators.
// ---------------------------------------------------

        SizeUtils.printSize(0, SizeUtils.FULL_UNITS, " ", ", ");                  // 0 bytes
        SizeUtils.printSize(10, SizeUtils.FULL_UNITS, " ", ", ");                 // 10 bytes
        SizeUtils.printSize(10240, SizeUtils.FULL_UNITS, " ", ", ");              // 10 kilobytes
        SizeUtils.printSize(10485760, SizeUtils.FULL_UNITS, " ", ", ");           // 10 megabytes
        SizeUtils.printSize(10737418240, SizeUtils.FULL_UNITS, " ", ", ");        // 10 gigabytes
        SizeUtils.printSize(10995116277760, SizeUtils.FULL_UNITS, " ", ", ");     // 10 terabytes

        //                                                     ... 645 terabytes ...
        //                                                            |
        //                                                            v
        SizeUtils.printSize(31108834345654325, SizeUtils.FULL_UNITS, " ", ", ");  // 27 petabytes, 645 terabytes, 327 gigabytes, 712 megabytes, 806 kilobytes, 52 bytes
        //                                                                 ^^
        //                                                                 ||
        //                                                ... 645 terabytes, 327 gigabytes ...


        // Output:
        //
        //     0 bytes
        //     10 bytes
        //     10 kilobytes
        //     10 megabytes
        //     10 gigabytes
        //     10 terabytes
        //     27 petabytes, 645 terabytes, 327 gigabytes, 712 megabytes, 806 kilobytes, 52 bytes
    }
}



// ---------------------------------------------------
// SizeUtils.cs file:
// ---------------------------------------------------

public class SizeUtils
{
    public static readonly string[] SHORT_UNITS = { "B", "KB", "MB", "GB", "TB", "PB" };
    public static readonly string[] FULL_UNITS = { "bytes", "kilobytes", "megabytes", "gigabytes", "terabytes", "petabytes" };

    public static Dictionary<string, long?> calculateParts(long size, string[] units)
    {
        string ending = "$$_UNDEFINED_$$";
        Dictionary<string, long?> result = new Dictionary<string, long?>();

        foreach (string unit in units)
        {
            long total = (long)Math.Floor(size / 1024.0);
            long rest = size - 1024 * total;

            if (rest > 0)
                result.Add(unit, rest);

            ending = unit;
            size = total;
        }

        if (size > 0)
        {
            long? value = null;

            result[ending] = (result.TryGetValue(ending, out value) ? size + value : size);
        }

        return result;
    }

    public static Dictionary<string, long?> calculateParts(long size)
    {
        return calculateParts(size, SHORT_UNITS);
    }

    public static string renderSize(long size, string[] units, string spacer = "", string delimiter = " ")
    {
        Dictionary<string, long?> parts = calculateParts(size, units);
        string result = "";

        foreach (KeyValuePair<string, long?> pair in parts)
        {
            if (result.Length > 0)
                result = delimiter + result;

            result = pair.Value + spacer + pair.Key + result;
        }

        if (result.Length == 0)
            return "0" + spacer + (units.Length > 0 ? units[0] : "B");

        return result;
    }

    public static string renderSize(long size)
    {
        return renderSize(size, SHORT_UNITS);
    }

    public static void printSize(long size, string[] units, string spacer = "", string delimiter = " ")
    {
        Console.WriteLine(renderSize(size, units, spacer, delimiter));
    }

    public static void printSize(long size)
    {
        Console.WriteLine(renderSize(size, SHORT_UNITS));
    }
}