C# 创建execl文件 并且填充数据

第一步:引用文件

using NPOI.HSSF.UserModel;
using System.Data;
using CTUClassLibrary;
using System.IO;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.HSSF.Util;

这些文件，CTUClassLibrary;是自己写大sql查询语句，可以不用。其他的都需要引用

主体代码：

  protected void Page_Load(object sender, EventArgs e)
        {
            ZHLSExcel();
        }
        HSSFWorkbook workbook = new HSSFWorkbook();
        //设置最初的列
        protected List<string> ListZM = new List<string>() { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", };
        public void ZHLSExcel()
        {
            DataTable dt = new DataTable();
            string strWhere = "  BankID=0";
            //一下是其他js传过来的参数
            if (Request.Params["opstate"] != null)
            {
                string opstate = Request.Params["opstate"].ToString().Trim();
                if (opstate.Trim().Length >  && opstate != "")
                {
                    strWhere += " and ops='" + Request.Params["opstate"].ToString().Trim() + "'";
                }
            }
            string sql = " select hu as oney, df as money from table  where" + strWhere;
            classDBOP dbop = new classDBOP();
            dt = dbop.ExcSql(sql, ); //sql插叙结果集。可以自己写
            //  日期  金额  经办人  财务  出纳  对方账户
            string title = "流水表";//标题
            string[] biaoTou = new string[] { "日期", "收", "支", "经办人", "财务", "出纳", "对方账户" };//表头
            try
            {
                MemoryStream ms = new MemoryStream();
                HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet("newSheet1");
                string fileName = "流水表.xls";//文件名
                string filePath = Server.MapPath("~/TMFile/OAFile/BB_Report/CDay/" + fileName);//文件路径
                #region 填充标题
                IRow row = sheet.CreateRow();//第几行
                row.HeightInPoints = ;//行高
                ICell cell = row.CreateCell();//在行中添加一列
                cell.SetCellValue(title);//设置列的内容
                ICellStyle style = workbook.CreateCellStyle();
                style.Alignment = HorizontalAlignment.CENTER;
                style.VerticalAlignment = VerticalAlignment.CENTER;
                IFont font = workbook.CreateFont();
                font.FontHeightInPoints = ;
                style.SetFont(font);
                cell.CellStyle = style;
                int cellRows = dt.Rows.Count;
                int cellNo = dt.Columns.Count;
                sheet.AddMergedRegion(new CellRangeAddress(, , , cellNo - ));
                CellRangeAddress cellRangeAddress = new CellRangeAddress(, , , cellNo - );
                sheet.AddMergedRegion(cellRangeAddress);
                #endregion
                #region 填充表头
                IRow row1 = sheet.CreateRow();
                for (int j = ; j < biaoTou.Length; j++)
                {
                    //吧biaoTou表头得类容写入
                    row1.CreateCell(j).SetCellValue(biaoTou[j]);
                }
                #endregion
                #region 填充内容
                decimal allshou = , allzhi = ;
                for (int r = ; r < dt.Rows.Count; r++)
                {
                    IRow rows = sheet.CreateRow(r + );//cellRows + 2
                    for (int c = ; c < dt.Columns.Count; c++)
                    {
                        rows.CreateCell(c).SetCellValue(dt.Rows[r][c].ToString());
                        //读取dt里面的数据。
                    }
                    allshou += Convert.IsDBNull(dt.Rows[r]["oney"]) ?  : decimal.Parse(dt.Rows[r]["oney"].ToString());
                    allzhi += Convert.IsDBNull(dt.Rows[r]["money"]) ?  : decimal.Parse(dt.Rows[r]["money"].ToString());

                }
                #endregion
                #region 尾部
                IRow rowM = sheet.CreateRow(cellRows + );
                rowM.HeightInPoints = ;
                ICell ceeM = rowM.CreateCell();
                ceeM.SetCellValue("收入：" + allshou.ToString());
                ceeM = rowM.CreateCell();
                ceeM.SetCellValue("支出：" + allzhi.ToString());

                IRow rowAdd = sheet.CreateRow(cellRows + );
                rowAdd.HeightInPoints = ;
                ICell ceeAdd = rowAdd.CreateCell();
                ceeAdd.SetCellValue("制单人：" + Session["Name"].ToString().Trim() + "  日期：" + DateTime.Now.ToShortDateString());
                IRow rowEnd = sheet.CreateRow(cellRows + );
                rowEnd.HeightInPoints = ;
                ICell cellEnd = rowEnd.CreateCell();
                cellEnd.SetCellValue("此表由XXXXX" + DateTime.Now.ToString("yyyy年MM月dd日") + "导出    ");
                ICellStyle styleEnd = workbook.CreateCellStyle();
                styleEnd.Alignment = HorizontalAlignment.RIGHT;
                styleEnd.VerticalAlignment = VerticalAlignment.CENTER;
                IFont fontEnd = workbook.CreateFont();
                fontEnd.FontHeightInPoints = ;
                fontEnd.Color = HSSFColor.GREY_50_PERCENT.index;
                fontEnd.Boldweight = (short)FontBoldWeight.BOLD;
                styleEnd.SetFont(fontEnd);
                cellEnd.CellStyle = styleEnd;
                sheet.AddMergedRegion(new CellRangeAddress(cellRows + , cellRows + , , cellNo - ));//起始行号，终止行号， 起始列号，终止列号
                #endregion
                #region 保存
                workbook.Write(ms);
                using (FileStream stream = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite))
                {
                    //创建文件，将workbook写入文件
                    workbook.Write(stream);
                }
                workbook = null;
                ms.Close();
                ms.Dispose();
                FileInfo file = new FileInfo(filePath);
                Response.Clear();
                Response.Charset = "GB2312";
                Response.ContentEncoding = System.Text.Encoding.UTF8;
                //添加头信息，为"文件下载/另存为"对话框指定默认文件名
                Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
                Response.AddHeader("Content-Length", file.Length.ToString());//添加头信息，指定文件大小，让浏览器能够显示下载进度
                Response.ContentType = "application/ms-excel";//指定返回的是一个不能被客户端读取的流，必须被下载
                Response.WriteFile(file.FullName);//把文件流发送到客户端
                Response.End();//停止页面的执行
                #endregion
            }
            catch (System.Exception ex)
            {
            }

        }

我觉得这方法不错，自己记录一下。也给你看看

以下是结果图