Oracle导出Excel，两种方法比较

/// <summary>
        /// 普通方式 生成EXCEL
        /// </summary>
        /// <param name="dt">临时表</param>
        /// <param name="filePath">文件名 带路径</param>
        /// <param name="fileName">文件名</param>
        public void CreateExcel(DataTable dt, string filePath, string fileName)
        {
            Excel.Application excel1 = new Excel.Application();
            excel1.DisplayAlerts = false;
            Excel.Workbook workbook1 = excel1.Workbooks.Add(Type.Missing);
            excel1.Visible = false;
            Excel.Worksheet worksheet1 = (Excel.Worksheet)workbook1.Worksheets["sheet1"];
            //表头    
            worksheet1.Cells[1, 1] = "姓名";  //Excel里从第1行，第1列计算    
            worksheet1.Cells[1, 2] = "身份证号";
            worksheet1.Cells[1, 3] = "发放类型";
            worksheet1.Cells[1, 4] = "人员类型";
            worksheet1.Cells[1, 5] = "发放金额";
            worksheet1.Cells[1, 6] = "联系方式";

            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < dt.Columns.Count; j++)
                    worksheet1.Cells[i + 2, j + 1] = "'" + dt.Rows[i][j].ToString();
            }

            workbook1.SaveAs(filePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            excel1.Workbooks.Close();
            excel1.Quit();
            int generation = GC.GetGeneration(excel1);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(excel1);
            excel1 = null;
            GC.Collect(generation);
            Relese(filePath, fileName);
        }

　　

  /// <summary>
       /// 从服务器端下载 
       /// </summary>
       /// <param name="filePath">服务器端 文件名 带路径</param>
       /// <param name="fileName">服务器端 文件名</param>
        private void Relese(string filePath, string fileName) //从服务器下载文件
        {
            //打开要下载的文件，并把该文件存放在FileStream中    
            System.IO.FileStream Reader = System.IO.File.OpenRead(filePath);
            //文件传送的剩余字节数：初始值为文件的总大小    
            long Length = Reader.Length;
            HttpContext.Current.Response.Buffer = false;
            HttpContext.Current.Response.AddHeader("Connection", "Keep-Alive");
            HttpContext.Current.Response.ContentType = "application/octet-stream";
            HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
            HttpContext.Current.Response.AddHeader("Content-Length", Length.ToString());
            byte[] Buffer = new Byte[10000];    //存放欲发送数据的缓冲区    
            int ByteToRead;                     //每次实际读取的字节数    
            while (Length > 0)
            {
                //剩余字节数不为零，继续传送    
                if (Response.IsClientConnected)
                {
                    //客户端浏览器还打开着，继续传送    
                    ByteToRead = Reader.Read(Buffer, 0, 10000); //往缓冲区读入数据    
                    HttpContext.Current.Response.OutputStream.Write(Buffer, 0, ByteToRead); //把缓冲区的数据写入客户端浏览器    
                    HttpContext.Current.Response.Flush();   //立即写入客户端    
                    Length -= ByteToRead;   //剩余字节数减少    
                }
                else
                {
                    //客户端浏览器已经断开，阻止继续循环    
                    Length = -1;
                }
            }
            //关闭该文件    
            Reader.Close();
            if (System.IO.File.Exists(filePath))
            {
                System.IO.File.Delete(filePath);
            }
        }

引用using CarlosAg.ExcelXmlWriter;大大提高了导出速度

   #region 导出数据
        public bool ExportResult(DataTable dt)
        {
            try
            {
                if (dt != null && dt.Rows.Count > 0)
                {                  
                    dt.Columns["pername"].ColumnName = "姓名";
                    dt.Columns["percode"].ColumnName = "身份证号";
                    dt.Columns["applytype"].ColumnName = "发放类型";
                    dt.Columns["pertype"].ColumnName = "人员类型";
                    dt.Columns["appamt"].ColumnName = "申请金额";
                    dt.Columns["pertel"].ColumnName = "联系方式";

                   // string filename = MapPath(DateTime.Now.ToString("ddhhmmsss") + ".xls");
                    string filename = Server.MapPath("/") + "temp" + "\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";
                    bool b = ImportExcel(filename, "申请信息表", 10000, dt);
                    
                    GC.Collect();
                    if (b)
                    {
                        System.IO.FileInfo info = new System.IO.FileInfo(filename);
                        long fileSize = info.Length;

                        System.IO.FileStream Reader = System.IO.File.OpenRead(filename);
                        long Length = Reader.Length;

                        HttpContext.Current.Response.Clear();
                        Response.ContentType = "application/vnd.ms-excel";
                        Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("申请信息表" + DateTime.Now.ToString("yyyy-MM-dd-hhmmsss") + ".xls"));
                       // Response.AddHeader("Content-Disposition", "attachment; filename="+filename);
                        
                        HttpContext.Current.Response.AddHeader("Content-Length", fileSize.ToString());

                        byte[] Buffer = new Byte[10000];    //存放欲发送数据的缓冲区    
                        int ByteToRead;                     //每次实际读取的字节数    
                        while (Length > 0)
                        {
                            //剩余字节数不为零，继续传送    
                            if (Response.IsClientConnected)
                            {
                                //客户端浏览器还打开着，继续传送    
                                ByteToRead = Reader.Read(Buffer, 0, 10000); //往缓冲区读入数据    
                                HttpContext.Current.Response.OutputStream.Write(Buffer, 0, ByteToRead); //把缓冲区的数据写入客户端浏览器    
                                HttpContext.Current.Response.Flush();   //立即写入客户端    
                                Length -= ByteToRead;   //剩余字节数减少    
                            }
                            else
                            {
                                //客户端浏览器已经断开，阻止继续循环    
                                Length = -1;
                            }
                        }
                        //关闭该文件    
                        Reader.Close();
                    }
                    if (System.IO.File.Exists(filename))
                    {
                        System.IO.File.Delete(filename);
                    }
                }
                return true;
            }
            catch (Exception ex)
            {
                //logger.Error("申请信息导出失败！", ex);
                return false;
            }
            finally
            {
                GC.Collect();
            }
        }


        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <param name="savePath">c:\文件名.xls</param>
        /// <param name="sheetName">标签的名字</param>
        /// <param name="sheetCount">一个标签多少条</param>
        /// <param name="dt">数据集</param>
        /// <returns></returns>
        public static bool ImportExcel(string savePath, string sheetName, int sheetCount, System.Data.DataTable dt)
        {
            Workbook book = new Workbook();
            Worksheet sheet = null;// book.Worksheets.Add("Sample");
            WorksheetRow row = null;
            try
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {

                    if (i % sheetCount == 0)
                    {
                        sheet = book.Worksheets.Add(sheetName + (i / sheetCount).ToString());
                        #region 生成列名
                        row = sheet.Table.Rows.Add();
                        for (int j = 0; j < dt.Columns.Count; j++)
                        {
                            // 第一行，  生成列名
                            row.Cells.Add(dt.Columns[j].ColumnName);
                        }
                        #endregion
                    }
                    row = sheet.Table.Rows.Add();
                    for (int k = 0; k < dt.Columns.Count; k++)
                    {
                        row.Cells.Add(dt.Rows[i][k].ToString());
                    }
                }
                book.Save(savePath);


                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }

        #endregion