NPOI处理excel文件，日期类型自定义格式显示以及打开文件时强制运行公式计算

    IWorkbook workbook = new XSSFWorkbook();ISheet sheet = workbook.CreateSheet("Sheet1");IRow row = sheet.CreateRow(0);// 创建日期格式样式ICellStyle dateStyle = workbook.CreateCellStyle();dateStyle.DataFormat = workbook.CreateDataFormat().GetFormat("yyyy-MM-dd");// 创建单元格并设置日期值及样式ICell cell = row.CreateCell(0);cell.SetCellValue(DateTime.Now); // 自动设为Numeric类型cell.CellStyle = dateStyle;// 保存文件using (FileStream fs = new FileStream("output.xlsx", FileMode.Create)){//打开excel文件时强制运行所有计算公式workbook.ForceFormulaRecalculation = true;workbook.Write(fs);}