Kapazität mit Einheit darstellen

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using System;

namespace ViperBytes.IO
{
    /// <summary>
    /// Handles a capacity in bytes
    /// </summary>
    class Capacity
    {
        #region statics
        /// <summary>
        /// The units of byte
        /// </summary>
        public static string[] Units = new string[] { "Byte", "KiloByte", "MegaByte", "GigaByte", "TeraByte", "PetaByte", "ExaByte", "ZettaByte", "YottaByte" };

        /// <summary>
        /// Short forms of the units
        /// </summary>
        public static string[] ShortUnits = new string[] { "Byte", "KByte", "MByte", "GByte", "TByte", "PByte", "EByte", "ZByte", "YByte" };

        /// <summary>
        /// Shortest forms of units
        /// </summary>
        public static string[] VeryShortUnits = new string[] { "Byte", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
        #endregion

        #region fields
        /// <summary>
        /// Contains the number of bytes
        /// </summary>
        private decimal bytes;
        #endregion

        #region properties
        /// <summary>
        /// Contains the bytes, read only
        /// </summary>
        public decimal Bytes
        {
            get
            {
                return this.bytes;
            }
        }
        #endregion

        #region constructor
        /// <summary>
        /// Constructor
        /// </summary>
        public Capacity()
        {
            this.bytes = 0;
        }

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="bytes">Number of bytes</param>
        public Capacity(decimal bytes)
        {
            this.bytes = bytes;
        }

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="size">Size string in form of a number, followed of a space and the unit</param>
        public Capacity(string size)
        {
            decimal number;
            int unit;

            // the first is, to get the separator, that is a space char
            if (size.Contains(" "))
            {
                int i = size.LastIndexOf(" ");

                try
                {
                    number = Decimal.Parse(size.Substring(0, i));
                    unit = GetStringUnit(size.Substring(i + 1));
                }
                catch
                {
                    number = 0;
                    unit = 0;
                }
            }
            else
            {
                // no separator found - no unit!
                try
                {
                    number = Decimal.Parse(size);
                    unit = 0;
                }
                catch
                {
                    number = 0;
                    unit = 0;
                }
            }

            // set bytes
            try
            {
                this.bytes = Math.Floor(number * (decimal)Math.Pow(1024, unit));
            }
            catch
            {
                this.bytes = 0;
            }
        }
        #endregion

        #region public members
        /// <summary>
        /// Returns size in string without unit
        /// </summary>
        /// <returns>Size in string</returns>
        public override string ToString()
        {
            return ToString(GetOptimalUnit());
        }

        /// <summary>
        /// Returns size in string without unit
        /// </summary>
        /// <param name="unit">The unit string</param>
        /// <returns>Size in string</returns>
        public string ToString(string unit)
        {
            return ToString(GetStringUnit(unit));
        }

        /// <summary>
        /// Returns size in string without unit
        /// </summary>
        /// <param name="unit">The unit integer from 0 to 9</param>
        /// <returns>Size in string</returns>
        public string ToString(int unit)
        {
            return (Bytes / (decimal)Math.Pow(1024, unit)).ToString("n");
        }

        /// <summary>
        /// Returns size in string with unit
        /// </summary>
        /// <returns>Size in string</returns>
        public string ToUnitString()
        {
            return ToUnitString(GetOptimalUnit());
        }

        /// <summary>
        /// Returns size in string with unit
        /// </summary>
        /// <param name="unit">The unit string</param>
        /// <returns>Size in string</returns>
        public string ToUnitString(string unit)
        {
            return ToUnitString(GetStringUnit(unit));
        }

        /// <summary>
        /// Returns size in string with unit
        /// </summary>
        /// <param name="unit">The unit integer from 0 to 9</param>
        /// <returns>Size in string</returns>
        public string ToUnitString(int unit)
        {
            return (Bytes / (decimal)Math.Pow(1024, unit)).ToString("n") + " " + Units[unit];
        }

        /// <summary>
        /// Returns size in string with short unit
        /// </summary>
        /// <returns>Size in string</returns>
        public string ToShortUnitString()
        {
            return ToShortUnitString(GetOptimalUnit());
        }

        /// <summary>
        /// Returns size in string with short unit
        /// </summary>
        /// <param name="unit">The unit string</param>
        /// <returns>Size in string</returns>
        public string ToShortUnitString(string unit)
        {
            return ToShortUnitString(GetStringUnit(unit));
        }

        /// <summary>
        /// Returns size in string with short unit
        /// </summary>
        /// <param name="unit">The unit integer from 0 to 9</param>
        /// <returns>Size in string</returns>
        public string ToShortUnitString(int unit)
        {
            return (Bytes / (decimal)Math.Pow(1024, unit)).ToString("n") + " " + ShortUnits[unit];
        }

        /// <summary>
        /// Returns size in string with very short unit
        /// </summary>
        /// <returns>Size in string</returns>
        public string ToVeryShortUnitString()
        {
            return ToVeryShortUnitString(GetOptimalUnit());
        }

        /// <summary>
        /// Returns size in string with very short unit
        /// </summary>
        /// <param name="unit">The unit string</param>
        /// <returns>Size in string</returns>
        public string ToVeryShortUnitString(string unit)
        {
            return ToVeryShortUnitString(GetStringUnit(unit));
        }

        /// <summary>
        /// Returns size in string with very short unit
        /// </summary>
        /// <param name="unit">The unit integer from 0 to 9</param>
        /// <returns>Size in string</returns>
        public string ToVeryShortUnitString(int unit)
        {
            return (Bytes / (decimal)Math.Pow(1024, unit)).ToString("n") + " " + VeryShortUnits[unit];
        }
        #endregion

        #region privates members
        /// <summary>
        /// Gets optimal display unit
        /// </summary>
        /// <returns>The unit from 0 (byte) to 8 (yottabyte)</returns>
        private int GetOptimalUnit()
        {
            int unit = 0;
            // get optimal unit
            while (true)
            {
                if (Bytes < (decimal)Math.Pow(1024, unit))
                {
                    if (unit > 0)
                        unit--;
                    break;
                }

                if (unit < Units.Length - 1)
                    unit++;
                else
                    break;
            }

            return unit;
        }

        /// <summary>
        /// Gets a unit number from a string containing the unit
        /// </summary>
        /// <param name="unit">Contains the unit</param>
        /// <returns>An integer from 0 to 8</returns>
        private int GetStringUnit(string unit)
        {
            for (int i = 0; i < 9; i++)
            {
                if ((Units[i] == unit) || (ShortUnits[i] == unit) || (VeryShortUnits[i] == unit))
                    return i;
            }
            return 0;
        }
        #endregion
    }
}