C#：EXCEL列名、列序号之间互相转换

EXCEL的列名与列序号 之前的关系如下

        /// <summary>
        /// 根据给的EXCEL列序号，得出列名字母
        /// </summary>
        /// <param name="iColNum">序号</param>
        /// <returns>列名</returns>
        public string ColNum2Name(int iColNum)
        {
            string result = "";

            if (iColNum < 1 || iColNum > 16384)
            {
                throw new Exception("列号超出范围");
            }

            while (iColNum > 0)
            {
                iColNum--; //列号是从1开始的，字母从0开始的
                result = (char)('A' + iColNum % 26) + result;
                iColNum /= 26;
            }
            return result;
        }

        /// <summary>
        /// 根据给出的EXCEL列名，转换成列序号
        /// </summary>
        /// <param name="sColName">列名</param>
        /// <returns>序号</returns>
        public int ColName2Num(string sColName)
        {
            int result = 0;
            for (int i = 0; i < sColName.Length; i++)
            {
                result *= 26;
                result += sColName[i] - 'A' + 1;
            }
            return result;
        }