使用NPOI写入Excel数据（ASP.NET）

       IWorkbook wb = new HSSFWorkbook();

        //创建表  
        ISheet sh = wb.CreateSheet("XXX");
        //设置单元的宽度  
        sh.SetColumnWidth(0, 20 * 256);


        #region 合并单元格

       
        IRow row0 = sh.CreateRow(0);
        row0.Height = 20 * 20;
        ICell icell1top0 = row0.CreateCell(0);
        icell1top0.CellStyle = Getcellstyle(wb, stylexls.头);
        icell1top0.SetCellValue(getTitle());

        #endregion

        #region 创建问题题目
        IRow row1 = sh.CreateRow(1);
        // row1.Height = 20 * 20;

        ICell icell = null;

        ICell icell1top = row1.CreateCell(0);
        icell1top.CellStyle = Getcellstyle(wb, stylexls.头);
        icell1top.SetCellValue("姓名/问卷题目");

        string sqlAll = "select * from dbo.CheckMgr where UserID=" + rqid + " order by T_Sort asc";
        DataTable dtAll = SystemDAL.SQLHelper.GetTable(sqlAll);
        if (dtAll != null && dtAll.Rows.Count > 0)
        {
            for (int j = 0; j < dtAll.Rows.Count; j++)
            {
                sh.SetColumnWidth(j + 1, 40 * 256);
                //合并单元格//表头
               //CellRangeAddress（）该方法的参数次序是：开始行号，结束行号，开始列号，结束列号。
                sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dtAll.Rows.Count));

                string title = dtAll.Rows[j]["T_title"].ToString();

                icell = row1.CreateCell(j + 1);
                icell.SetCellValue(title);
            }
        }
        #endregion

        #region 创建对应题目的答案内容
        DataTable dtUser = getUserInfo();
        IRow row11 = null;
        for (int a = 0; a < dtUser.Rows.Count; a++)//学生
        {
            row11 = sh.CreateRow(a + 2);
            string user = dtUser.Rows[a]["realname"].ToString();
            string id = dtUser.Rows[a]["id"].ToString();
            for (int b = 0; b < dtAll.Rows.Count; b++)//题目
            {

                //每一行的第一列//用户姓名
                HSSFCell cell11 = row11.CreateCell(0) as HSSFCell;
                cell11.SetCellValue(user);

                DataTable dtInfo = getAnwer(id);
                if (dtInfo != null && dtInfo.Rows.Count > 0)
                {
                    for (int i = 0; i < dtInfo.Rows.Count; i++)
                    {
                        string key = dtInfo.Rows[b]["Ckey"].ToString();
                        string value = dtInfo.Rows[b]["Cvalue"].ToString();
                        string title = getMgrTitle(key, value);
                        HSSFCell cell1 = row11.CreateCell(b + 1) as HSSFCell;
                        cell1.SetCellValue(title);
                    }
                }

            }
        }

        #endregion

        #region 下载Excel
        Random r = new Random();
        string _fileName = string.Format("{0:yyyyMMddHHmmssfff}-{1}", DateTime.Now, r.Next(1, 9999)) + ".xls";
        using (MemoryStream ms = new MemoryStream())
        {
            wb.Write(ms);
            Response.Clear();
            Response.ClearHeaders();
            Response.Buffer = false;
            Response.ContentType = "application/octet-stream";
            Response.AppendHeader("Content-Disposition", "attachement;filename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.ASCII));
            Response.AppendHeader("Content-Length", ms.Length.ToString());
            Response.BinaryWrite(ms.GetBuffer());
            Response.Flush();
            Response.End();
        }
        #endregion