/// <summary>
 /// 获取列值字母
 /// </summary>
 /// <param name="value"></param>
 /// <returns></returns>
 public string GetColumnLetter(int value)
 {
     return(ExcelHelper.GetColumnLetter(value));
 }
 /// <summary>
 /// 获取字母代表列值
 /// </summary>
 /// <param name="value"></param>
 /// <returns></returns>
 public static int GetColumnValue(string value)
 {
     return(ExcelHelper.GetColumnValue(value));
 }