C#將數據大小字節轉換為MB,GB,TB

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using System;
using System.Collections.Generic;
using System.Text;

namespace ConvertDataSize
{
    public class Convert
    {
        /// <summary>
        /// 獲取
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        public string GetSize(long b)
        {
            if (b.ToString().Length <= 10)
                return GetMB(b);
            if (b.ToString().Length >= 11 && b.ToString().Length <=12)
                return GetGB(b);
            if (b.ToString().Length >= 13)
                return GetTB(b);
            return String.Empty;
        }

        /// <summary>
        /// 將B轉換為TB
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        private string GetTB(long b)
        {
            for (int i = 0; i < 4; i++)
            {
                b /= 1024;
            }
            return b + "TB";
        }

        /// <summary>
        /// 將B轉換為GB
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        private string GetGB(long b)
        {
            for (int i = 0; i < 3; i++)
            {
                b /= 1024;
            }
            return b + "GB";
        }

        /// <summary>
        /// 將B轉換為MB
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        private string GetMB(long b)
        {
            for (int i = 0; i < 2; i++)
            {
                b /= 1024;
            }
            return b + "MB";
        }
    }
}