asp.net 分页导出execl的方法

Question

请问在asp.net中怎样把分页中的数据全部导出到excel中。我现在只能实现把分页中的某一页数据导出到excel中，而不能全部把数据导出，请高手相助？绑定页面展示的分页代码：
private void BindListShow()
    {
        AspNetPager1.PageSize = 10;//初始化分页中每页显示的信息条数
        AspNetPager1.RecordCount = Convert.ToInt32(BLL.MileageReportManage.getMileageCount(DropDown_year.SelectedValue.ToString(), AspNetPager1.PageSize, AspNetPager1.CurrentPageIndex, "").ToString());
        DataList1.DataSource= mileageReportManage.getMileageReport(DropDown_year.SelectedValue.ToString(), AspNetPager1.PageSize, AspNetPager1.CurrentPageIndex, "").Tables[0].DefaultView;
        DataList1.DataBind();
    }
导出excel的代码：
 protected void ibtnDR_Click(object sender, ImageClickEventArgs e)
    {
        Response.Clear();//清空缓存
        Response.Buffer = true;//启用缓存
        Response.Charset = "GB2312";//设置编码格式
        Response.AppendHeader("Content-Disposition","attachment;filename=filename.xls");//设置输出文件格式
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
        Response.ContentType = "application/ms-Excel";//设置输出文件类型为Excel文件
        this.EnableViewState = false;
        System.Globalization.CultureInfo mycitrad = new System.Globalization.CultureInfo("ZH-CN",true);
        System.IO.StringWriter swriter = new System.IO.StringWriter(mycitrad);
        System.Web.UI.HtmlTextWriter htmltextw = new System.Web.UI.HtmlTextWriter(swriter);
        this.DataList1.RenderControl(htmltextw);//读取DataList1中的数据
        Response.Write(swriter.ToString());//输出到stringwriter
        Response.End();
    }标注：我用的是DataList控件展示的数据

Answer 1

导出excel的时候再查一次数据库取出所有数据，别用System.Web.UI.HtmlTextWriter了，直接导出你要的数据

Answer 2

 mileageReportManage.getMileageReport(DropDown_year.SelectedValue.ToString(), AspNetPager1.PageSize, AspNetPager1.CurrentPageIndex, "").Tables[0].DefaultView;
你这个数据源似乎查询的是当前页的数据  既然datalist的数据源都只有当前页的数据你怎么能够导出所有数据呢 

Answer 3

以上导出,只是需假通过,没有正式意义上的实现,你把导出来的execl文档用记事本打包会发现里面其实还是html代码这里见意LZ还是使用NPOI来操作
            string query = "Select cSendUnitName As 出货方,cPeriod As 流向期段,(datename(yyyy,dBillDate) + '-'+ datename(mm,dBillDate) +'-'+ datename(dd,dBillDate)) As 开票日,cRecMarketName As 收货市场,cRecUnitName As 收货方,cInvName As 品种,cInvStd As 规格,cBatch As 批次,iQuantity As 数量 From v_FlowRecordsList ";
            query += cond + "  Order By cInvName,cPeriod,cSendUnitName,dDate Desc";            DataTable dt = dbt.ExecuteTable(query, param);            NOPIHelper.ExportByWeb(dt, "流向数据列表", "流向数据列表.xls");

Answer 4

要导出所有数据是分情况的
第一种 数据量不是非常大 那查询的时候一次查出所有数据放在datatable中 分页的时候根据datatable查询分页，导出excle时为datatable的数据（这种情况可能第一次查询很慢 但分页很快）。
第二种 数据量庞大 查询的时候肯定只能一次查一页了 因为导出功能基本不会常用 所以在导出的时候再查询所有并导出，在导出的时候加点特效 让客户知道系统正在进行导出工作就好了

Answer 5

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using System.Web;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;   namespace Galsun.Common
{
    public class NOPIHelper
    {
        public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
        {
            using (MemoryStream ms = Export(dtSource, strHeaderText))
            {
                using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }               }
        }        public static MemoryStream Export(DataTable dtSource, string strHeaderText)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.CreateSheet();
            #region 右击文件 属性信息
            {
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                dsi.Company = "";
                workbook.DocumentSummaryInformation = dsi;
                SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
                si.Author = "";
                si.ApplicationName = "";
                si.Title = strHeaderText;
                si.CreateDateTime = DateTime.Now;
                workbook.SummaryInformation = si;
            }
            #endregion            HSSFCellStyle dateStyle = workbook.CreateCellStyle();
            //HSSFDataFormat format = 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，填充表头，填充列头，样式
                if (rowIndex == 65535 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        sheet = workbook.CreateSheet();
                    }
                    #region 表头及样式
                    {
                        HSSFRow headerRow = sheet.CreateRow(0);
                        headerRow.HeightInPoints = 25;
                        headerRow.CreateCell(0).SetCellValue(strHeaderText);
                        HSSFCellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = CellHorizontalAlignment.CENTER;
                        HSSFFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 20;
                        font.Boldweight = 700;
                        headStyle.SetFont(font);                        headerRow.GetCell(0).CellStyle = headStyle;                        sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
                        headerRow.Dispose();
                    }
                    #endregion                    #region 列头及样式
                    {
                        HSSFRow headerRow = sheet.CreateRow(1);
                        HSSFCellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = CellHorizontalAlignment.CENTER;
                        HSSFFont font = 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);                        }
                        headerRow.Dispose();
                    }
                    #endregion
                    rowIndex = 2;                }
                #endregion                #region 填充内容
                HSSFRow dataRow = sheet.CreateRow(rowIndex);
                foreach (DataColumn column in dtSource.Columns)
                {
                    HSSFCell newCell = dataRow.CreateCell(column.Ordinal);                    string drValue = row[column].ToString();                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型   
                            newCell.SetCellValue(drValue);
                            break;
                        case "System.DateTime"://日期类型   
                            DateTime dateV;
                            DateTime.TryParse(drValue, out dateV);
                            newCell.SetCellValue(dateV);                            newCell.CellStyle = dateStyle;//格式化显示   
                            break;
                        case "System.Boolean"://布尔型   
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            newCell.SetCellValue(boolV);
                            break;
                        case "System.Int16"://整型   
                        case "System.Int32":
                        case "System.Int64":
                        case "System.Byte":
                            int intV = 0;
                            int.TryParse(drValue, out intV);
                            newCell.SetCellValue(intV);
                            break;
                        case "System.Decimal"://浮点型   
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;
                        case "System.DBNull"://空值处理   
                            newCell.SetCellValue("");
                            break;
                        default:
                            newCell.SetCellValue("");
                            break;
                    }                }
                #endregion                rowIndex++;               }            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
                ms.Position = 0;
                sheet.Dispose();
                workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet   
                return ms;
            }   
        }        public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
        {            HttpContext curContext = HttpContext.Current;            // 设置编码和附件格式   
            curContext.Response.ContentType = "application/vnd.ms-excel";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition",
                "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));            curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
            curContext.Response.End();        }        public static void ExportByWeb(DataTable dtSource, string templatePath,string Sheet, int rowIndex,string strHeaderText, string strFileName)
        {            HttpContext curContext = HttpContext.Current;            // 设置编码和附件格式   
            curContext.Response.ContentType = "application/vnd.ms-excel";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition",
                "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));            curContext.Response.BinaryWrite(Export(dtSource, templatePath, Sheet, rowIndex, strHeaderText,null).GetBuffer());
            curContext.Response.End();        }
        public static void ExportByWeb(DataTable dtSource, string templatePath, string Sheet, int rowIndex, string strHeaderText, string strFileName,short[] backColor)
        {            HttpContext curContext = HttpContext.Current;            // 设置编码和附件格式   
            curContext.Response.ContentType = "application/vnd.ms-excel";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition",
                "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));            curContext.Response.BinaryWrite(Export(dtSource, templatePath, Sheet, rowIndex, strHeaderText, backColor).GetBuffer());
            curContext.Response.End();        }
     }
}

Answer 6

你们这些都太麻烦了  直接有一个Excel.bll类库 然后这里面有一个方式是用DataSet作为参数 直接导出excel 你想要导出什么样的表  只用控制你的DataSet就ok了

Answer 7

打开EXCEL模板，遍历数据集赋值到单元格
或使用隐藏的 gridview绑定所有数据，再导出