C#计算文件大小

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        /// <summary>
        /// 计算文件大小函数(保留两位小数),Size为字节大小
        /// </summary>
        /// <param name="Size">初始文件大小</param>
        /// <returns></returns>
        public static string CountSize(long? Size)
        {
            Size = Size ?? 0;
            string m_strSize = "";
            long FactSize = 0;
            FactSize = Size.Value;
            if (FactSize < 1024.00)
                m_strSize = "1K"; // m_strSize = FactSize.ToString("F2") + " Byte";
            else if (FactSize >= 1024.00 && FactSize < 1048576)
                m_strSize = (FactSize / 1024.00).ToString("F2") + " K";
            else if (FactSize >= 1048576 && FactSize < 1073741824)
                m_strSize = (FactSize / 1024.00 / 1024.00).ToString("F2") + " M";
            else if (FactSize >= 1073741824)
                m_strSize = (FactSize / 1024.00 / 1024.00 / 1024.00).ToString("F2") + " G";
            return m_strSize;
        }