先去官网:http://npoi.codeplex.com/下载需要引入dll(可以选择.net2.0或者.net4.0的dll),然后在网站中添加引用。
另:https://files.cnblogs.com/zhongxinWang/NPOI.rar
导出xlsx:http://www.cnblogs.com/zhongxinWang/p/4157674.html
一:将数据导出到excel
List<>作为数据源
//创建Excel文件的对象 NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); //添加一个sheet
NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("降雨量日报表"); //获取list数据 List<ST_RainInfo_Day> listRainInfo = ST_RainInfo_Day_Helper.ObjectList(dtBeginDate, dtEndDate); //给sheet1添加第一行的头部标题 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0); row1.CreateCell(0).SetCellValue("站名"); row1.CreateCell(1).SetCellValue("河名"); row1.CreateCell(2).SetCellValue("地址"); row1.CreateCell(3).SetCellValue("日雨量"); row1.CreateCell(4).SetCellValue("时间"); row1.CreateCell(5).SetCellValue("天气"); //将数据逐步写入sheet1各个行 for (int i = 0; i < listRainInfo.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].STNM.ToString()); rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].RVNM.ToString()); rowtemp.CreateCell(2).SetCellValue(listRainInfo[i].STLC.ToString()); rowtemp.CreateCell(3).SetCellValue(listRainInfo[i].DYP.ToString()); rowtemp.CreateCell(4).SetCellValue(listRainInfo[i].TM.ToString()); //用GetWether方法进行数据转换 rowtemp.CreateCell(5).SetCellValue(GetWether(listRainInfo[i].WTH.ToString())); } // 写入到客户端 System.IO.MemoryStream ms = new System.IO.MemoryStream(); book.Write(ms); Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff"))); Response.BinaryWrite(ms.ToArray()); book = null; ms.Close(); ms.Dispose();
DataTable作为数据源
DataTable dt = GetData(); NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("特征值报表");//雨情 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0); row1.CreateCell(0).SetCellValue("站号");
row1.CreateCell(1).SetCellValue("站名"); row1.CreateCell(2).SetCellValue("平均降雨(mm)"); row1.CreateCell(3).SetCellValue("总降雨量(mm)"); row1.CreateCell(4).SetCellValue("最大测站降雨(mm)"); row1.CreateCell(5).SetCellValue("最小测站降雨(mm)"); for (int i = 0; i < dt.Rows.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); rowtemp.CreateCell(0).SetCellValue(dt.Rows[i]["STCD"].ToString()); rowtemp.CreateCell(1).SetCellValue(dt.Rows[i]["STNM"].ToString()); rowtemp.CreateCell(2).SetCellValue(dt.Rows[i]["AvgDYP"].ToString()); rowtemp.CreateCell(3).SetCellValue(dt.Rows[i]["SumDYP"].ToString()); rowtemp.CreateCell(4).SetCellValue(dt.Rows[i]["MaxDYP"].ToString()); rowtemp.CreateCell(5).SetCellValue(dt.Rows[i]["MinDYP"].ToString()); } // 写入到客户端 System.IO.MemoryStream ms = new System.IO.MemoryStream(); book.Write(ms); Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff"))); Response.BinaryWrite(ms.ToArray()); book = null; ms.Close(); ms.Dispose();
二:从Excel中导入数据到
可先将excel文件上传到服务器的临时位置,获取filePath,然后再行读取、导入。
HSSFWorkbook hssfworkbook; #region public DataTable ImportExcelFile(string filePath) { #region//初始化信息 try { using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read)) { hssfworkbook = new HSSFWorkbook(file); } } catch (Exception e) { throw e; } #endregion NPOI.SS.UserModel.Sheet sheet = hssfworkbook.GetSheetAt(0); System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); DataTable dt = new DataTable(); //给DdataTable添加表头 for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++) { dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString()); } //读取数据 while (rows.MoveNext()) { HSSFRow row = (HSSFRow)rows.Current; DataRow dr = dt.NewRow(); for (int i = 0; i < row.LastCellNum; i++) { NPOI.SS.UserModel.Cell cell = row.GetCell(i); if (cell == null) { dr[i] = null; } else { dr[i] = cell.ToString(); } } dt.Rows.Add(dr); } return dt; } #endregion
三:大于65535条记录
//创建Excel文件的对象 NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); //添加一个sheet NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("sheet1"); //sheet列表,防止记录条数大于65535 List<NPOI.SS.UserModel.ISheet> sheetList = new List<NPOI.SS.UserModel.ISheet>(); sheetList.Add(sheet1); //给sheet1添加数据 SheetFirst(sheet1, book, datalist); //给其他sheet添加数据 从1开始:去掉第一个sheet +2是有表头和标题的那2行 int rows = datalist.Count + 2; int p = rows % 65535 == 0 ? rows / 65535 : (rows / 65535) + 1; for (int i = 1; i < p; i++) { NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("sheet" + (i + 1).ToString()); //为sheet添加数据 SheetElse(sheet, (i - 1) * 65535 + 65533, datalist); } // 写入到客户端 System.IO.MemoryStream ms = new System.IO.MemoryStream(); book.Write(ms); Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff"))); Response.BinaryWrite(ms.ToArray()); book = null; ms.Close(); ms.Dispose();
//第一个Sheet protected void SheetFirst(NPOI.SS.UserModel.ISheet sheet1, NPOI.HSSF.UserModel.HSSFWorkbook book, List<ST_WaterLevel_GradualMonth> datalist) { //标题 NPOI.SS.UserModel.ICell cellTitle = sheet1.CreateRow(0).CreateCell(0); cellTitle.SetCellValue("水位月报表--" + drpCategory.SelectedItem.Text); //设置标题行样式 NPOI.SS.UserModel.ICellStyle style = book.CreateCellStyle(); style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER; NPOI.SS.UserModel.IFont font = book.CreateFont(); font.FontHeight = 20 * 20; style.SetFont(font); cellTitle.CellStyle = style; //合并标题行 sheet1.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 9)); //给sheet1添加第一行的头部标题 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(1); row1.CreateCell(0).SetCellValue("序号"); row1.CreateCell(1).SetCellValue("测站编码"); row1.CreateCell(2).SetCellValue("测站名称"); row1.CreateCell(3).SetCellValue("河流名称"); row1.CreateCell(4).SetCellValue("日期"); row1.CreateCell(5).SetCellValue("平均水位"); row1.CreateCell(6).SetCellValue("八点水位"); row1.CreateCell(7).SetCellValue("零点水位"); //将数据逐步写入sheet1各个行 for (int i = 0; i < datalist.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 2); rowtemp.CreateCell(0).SetCellValue(datalist[i].Row.ToString()); rowtemp.CreateCell(1).SetCellValue(datalist[i].STCD.ToString()); rowtemp.CreateCell(2).SetCellValue(datalist[i].STNM.ToString()); rowtemp.CreateCell(3).SetCellValue(datalist[i].RVNM.ToString()); rowtemp.CreateCell(4).SetCellValue(datalist[i].TM.ToString()); rowtemp.CreateCell(5).SetCellValue(datalist[i].AvgLevel.ToString()); rowtemp.CreateCell(6).SetCellValue(datalist[i].EightLevel.ToString()); rowtemp.CreateCell(7).SetCellValue(datalist[i].ZeroLevel.ToString()); } }
//其他sheet protected void SheetElse(NPOI.SS.UserModel.ISheet sheet, int j, List<ST_WaterLevel_GradualMonth> datalist) { //将数据逐步写入sheet1各个行 for (int i = 0; j + i < datalist.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet.CreateRow(i); rowtemp.CreateCell(0).SetCellValue(datalist[j + i].Row.ToString()); rowtemp.CreateCell(1).SetCellValue(datalist[j + i].STCD.ToString()); rowtemp.CreateCell(2).SetCellValue(datalist[j + i].STNM.ToString()); rowtemp.CreateCell(3).SetCellValue(datalist[j + i].RVNM.ToString()); rowtemp.CreateCell(4).SetCellValue(datalist[j + i].TM.ToString()); rowtemp.CreateCell(5).SetCellValue(datalist[j + i].AvgLevel.ToString()); rowtemp.CreateCell(6).SetCellValue(datalist[j + i].ZeroLevel.ToString()); } }