/// <summary>
        /// 删除列
        /// </summary>
        /// <param name="sheetIndex"></param>
        /// <param name="columnIndex"></param>
        /// <param name="count"></param>
        public void DeleteColumns(int sheetIndex, int columnIndex, int count)
        {
            if (sheetIndex > this.WorkSheetCount)
            {
                this.KillExcelProcess();
                throw new Exception("索引超出范围,WorkSheet索引不能大于WorkSheet数量!");
            }

            try
            {
                workSheet = (Excel.Worksheet)workBook.Worksheets[sheetIndex];
                range = (Excel.Range)workSheet.Columns[this.missing, columnIndex];

                for (int i = 0; i < count; i++)
                {
                    range.Delete(Excel.XlDirection.xlDown);
                }
            }
            catch (Exception e)
            {
                this.KillExcelProcess();
                throw e;
            }
        }
        /// <summary>
        /// 删除列
        /// </summary>
        /// <param name="columnIndex"></param>
        /// <param name="count"></param>
        public void DeleteColumns(int columnIndex, int count)
        {
            try
            {
                for (int n = 1; n <= this.WorkSheetCount; n++)
                {
                    workSheet = (Excel.Worksheet)workBook.Worksheets[n];
                    range = (Excel.Range)workSheet.Columns[this.missing, columnIndex];

                    for (int i = 0; i < count; i++)
                    {
                        range.Delete(Excel.XlDirection.xlDown);
                    }
                }
            }
            catch (Exception e)
            {
                this.KillExcelProcess();
                throw e;
            }
        }