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  • NPOI(1):Asp.net操作Excel

     

    原文:Asp.net操作Excel(终极方法NPOI)

        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

    复制代码
    //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();
    复制代码

        DataTable作为数据源

    复制代码
    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();
    复制代码

    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。

    复制代码
    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
    复制代码

    三:大于65535条记录

    复制代码
     //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();
    复制代码
    复制代码
     //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());
                }
            }
    复制代码
    复制代码
     //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());
                }
            }
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  • 原文地址:https://www.cnblogs.com/yuyangbk/p/5305569.html
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