npoi/HttpResponse 导出excel 实现下载

Httpresponse 导出excel---下载到本地

public void CreateExcel(DataSet ds, string FileName)
    {
        HttpResponse resp;
        resp = Page.Response;
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
        string colHeaders = "", ls_item = "";
        int i = 0;
        DataTable dt = ds.Tables[0];
        DataRow[] myRow = dt.Select("");
        for (i = 0; i < dt.Columns.Count; i++)
        {//标题
            if (i == dt.Columns.Count - 1)
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "
";
            }
            else
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "	";
            }
        }
        resp.Write(colHeaders);
        foreach (DataRow row in myRow)
        {//内容
            for (i = 0; i < dt.Columns.Count; i++)
            {
                #region 如有限制输出
                if (dt.Columns[i].Caption.ToString() == "检测结果")
                    ls_item += Common.ShopCommon.GetSurShopIRsult(Convert.ToInt32(row[i].ToString())) + "	";
                if ((row[i].ToString() == "0" || row[i].ToString() == "1") && dt.Columns[i].Caption.ToString() != "确认后地址" 
                    && dt.Columns[i].Caption.ToString() != "确认后名称"
                    && dt.Columns[i].Caption.ToString() != "其他结果"&& dt.Columns[i].Caption.ToString() != "备注"
                    && !dt.Columns[i].Caption.Contains(ConfigurationManager.AppSettings["Q35"])
                    && !dt.Columns[i].Caption.Contains(ConfigurationManager.AppSettings["Q36"])
                    && !dt.Columns[i].Caption.Contains(ConfigurationManager.AppSettings["Q4"])
                    && !dt.Columns[i].Caption.Contains(ConfigurationManager.AppSettings["Q5"])
                    && !dt.Columns[i].Caption.Contains(ConfigurationManager.AppSettings["Q76"]))
                {
                    if (row[i].ToString() == "0")
                    {
                        if (i == dt.Columns.Count - 1)
                            ls_item += "否" + "
";
                        else
                            ls_item += "否" + "	";
                    }
                    else if (row[i].ToString() == "1")
                    {
                        if (i == dt.Columns.Count - 1)
                            ls_item += "是" + "
";
                        else
                            ls_item += "是" + "	";
                    }
                }
                else if (dt.Columns[i].Caption.ToString() != "检测结果" && !dt.Columns[i].Caption.Contains(ConfigurationManager.AppSettings["Q7"]))
                {
                    if (i == dt.Columns.Count - 1)
                        ls_item += row[i].ToString() + "
";
                    else
                        ls_item += row[i].ToString() + "	";
                }
                #endregion
            } 
            //一般情况输出
            // if (i == dt.Columns.Count - 1)
            //            ls_item += row[i].ToString() + "
";
           //  else
            //ls_item += row[i].ToString() + "	";
            resp.Write(ls_item);
            ls_item = "";
        }
        //写缓冲区中的数据到HTTP头文件中 
        resp.End();
    }
    //repeater调用
    protected void NewsList_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        if (e.CommandName == "downitem")
        {
            string id = e.CommandArgument.ToString();
            string tiem = DateTime.Now.ToString()+".xls";
            CreateExcel(sm.GetToExcel(id), tiem);
        }
    }                

npoi-导出到excel---下载到本地

需要下载npoi.dll，自己去百度把

需要添加命名空间

using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;

protected void NewsList_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        if (e.CommandName == "downitem")
        {
            string id = e.CommandArgument.ToString();
            string tiem = DateTime.Now.ToString() + ".xls";
            DataSet ds = sm.GetToExcel(id);
            DataTable dt = ds.Tables[0];
            int i = dt.Rows.Count;
            DataTableToExcel(dt, tiem);
        }
    }
    /// <summary>
    /// DataTable导出到Excel
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strFileName">保存文件名</param>
    public MemoryStream DataTableToExcel(DataTable dtSource, string strFileName)
    {  
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();
        HSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle();
        HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat();
        dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
        //取得列宽
        int[] arrColWidth = new int[dtSource.Columns.Count];
        foreach (DataColumn item in dtSource.Columns)
        {
            arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
        }
        for (int i = 0; i < dtSource.Rows.Count; i++)
        {
            for (int j = 0; j < dtSource.Columns.Count; j++)
            {
                int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                if (intTemp > arrColWidth[j])
                {
                    arrColWidth[j] = intTemp;
                }
            }
        }
        int rowIndex = 0;
        foreach (DataRow row in dtSource.Rows)
        {
            #region 新建表，填充列头，样式
            if (rowIndex == 65535 || rowIndex == 0)
            {
                if (rowIndex != 0)
                {
                    sheet = (HSSFSheet)workbook.CreateSheet();
                }
                #region 列头及样式
                {
                    HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
                    HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
                    HSSFFont font = (HSSFFont)workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);
                    foreach (DataColumn column in dtSource.Columns)
                    {
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                        headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
                        //设置列宽
                        sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                    }
                }
                #endregion
                rowIndex = 1;
            }
            #endregion
            #region 填充内容
            HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
            foreach (DataColumn column in dtSource.Columns)
            {
                HSSFCell newCell = (HSSFCell)dataRow.CreateCell(column.Ordinal);
                string drValue = row[column].ToString();
                
                if (dtSource.Columns[column.Ordinal].Caption.ToString() == "检测结果")
                    newCell.SetCellValue(Common.ShopCommon.GetSurShopIRsult(Convert.ToInt32(drValue)));
                if ((drValue == "0" || drValue == "1") && dtSource.Columns[column.Ordinal].Caption.ToString() != "确认后地址"
                    && dtSource.Columns[column.Ordinal].Caption.ToString() != "确认后名称"
                    && dtSource.Columns[column.Ordinal].Caption.ToString() != "其他结果"
                    && dtSource.Columns[column.Ordinal].Caption.ToString() != "备注"
                    && !dtSource.Columns[column.Ordinal].Caption.Contains(ConfigurationManager.AppSettings["Q35"])
                    && !dtSource.Columns[column.Ordinal].Caption.Contains(ConfigurationManager.AppSettings["Q36"])
                    && !dtSource.Columns[column.Ordinal].Caption.Contains(ConfigurationManager.AppSettings["Q4"])
                    && !dtSource.Columns[column.Ordinal].Caption.Contains(ConfigurationManager.AppSettings["Q5"])
                    && !dtSource.Columns[column.Ordinal].Caption.Contains(ConfigurationManager.AppSettings["Q76"]))
                {
                    if (drValue == "0")
                        newCell.SetCellValue("否");
                    else if (drValue == "1")
                        newCell.SetCellValue("是");
                }
                else if (dtSource.Columns[column.Ordinal].Caption.ToString() != "检测结果" && !dtSource.Columns[column.Ordinal].Caption.Contains(ConfigurationManager.AppSettings["Q7"]))
                    newCell.SetCellValue(drValue);

            }
            #endregion
            rowIndex++;
        }
        using (MemoryStream ms = new MemoryStream())
        {
            workbook.Write(ms);
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + strFileName);
            Response.BinaryWrite(ms.ToArray());
            workbook = null;
            ms.Flush();
            ms.Position = 0;
            sheet.Dispose();
            return ms;
        }
    }