/// <summary>字节单位换算</summary>
        public static string ByteConversion(double length)
        {
            string temp;

            if (length < 1024)
            {
                temp = Math.Round(length, 0) + "B";
            }

            else if (length < 1024 * 1024)
            {
                temp = Math.Round(length / (1024), 0) + "KB";
            }

            else if (length < 1024 * 1024 * 1024)
            {
                temp = Math.Round(length / (1024 * 1024), 2) + "MB";
            }

            else
            {
                temp = Math.Round(length / (1024 * 1024 * 1024), 2) + "GB";
            }

            return temp;
        }