//列宽自适应，只对英文和数字有效for (int i = 0; i <= maxColumn; i++){    sheet.AutoSizeColumn(i);}//获取当前列的宽度，然后对比本列的长度，取最大值for (int columnNum = 0; columnNum <= maxColumn; columnNum++){    int columnWidth = sheet.GetColumnWidth(columnNum) / 256;    for (int rowNum = 1; rowNum <= sheet.LastRowNum; rowNum++)    {        IRow currentRow;        //当前行未被使用过        if (sheet.GetRow(rowNum) == null)        {            currentRow = sheet.CreateRow(rowNum);        }        else         {            currentRow = sheet.GetRow(rowNum);        }                                    if(currentRow.GetCell(columnNum) != null)        {            ICell currentCell = currentRow.GetCell(columnNum);            int length = Encoding.Default.GetBytes(currentCell.ToString()).Length;            if (columnWidth < length)            {                columnWidth = length;            }        }    }    sheet.SetColumnWidth(columnNum, columnWidth * 256);}