NPOI导出Excel 65536限制

        #region NPOI 导出excel数据超65535自动分表
        /// <summary>
        /// DataTable转换成Excel文档流，并输出到客户端
        /// </summary>
        /// <param name="table"></param>
        /// <param name="response"></param>
        /// <param name="fileName">输出的文件名</param>
        public static void RenderToDataTableToExcel(DataSet ds, string fileName)
        {
            for (int i = 0; i < ds.Tables.Count; i++)
            {
                using (MemoryStream ms = ExportDataTableToExcel(ds.Tables[i]))
                {
                    RenderToBrowser(ms, HttpContext.Current, fileName);
                } 
            }
        }

        /// <summary>
        /// DataTable转换成Excel文档流(导出数据量超出65535条,分sheet)
        /// </summary>
        /// <param name="table"></param>
        /// <returns></returns>
        public static MemoryStream ExportDataTableToExcel(DataTable sourceTable)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            int dtRowsCount = sourceTable.Rows.Count;
            int SheetCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(dtRowsCount) / 65536));
            int SheetNum = 1;
            int rowIndex = 1;
            int tempIndex = 1; //标示 
            ISheet sheet = workbook.CreateSheet("sheet1" + SheetNum);
            for (int i = 0; i < dtRowsCount; i++)
            {
                if (i == 0 || tempIndex == 1)
                {
                    IRow headerRow = sheet.CreateRow(0);
                    foreach (DataColumn column in sourceTable.Columns)
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                }
                HSSFRow dataRow = (HSSFRow)sheet.CreateRow(tempIndex);
                foreach (DataColumn column in sourceTable.Columns)
                {
                    dataRow.CreateCell(column.Ordinal).SetCellValue(sourceTable.Rows[i][column].ToString());
                }
                if (tempIndex == 65535)
                {
                    SheetNum++;
                    sheet = workbook.CreateSheet("sheet" + SheetNum);//
                    tempIndex = 0;
                }
                rowIndex++;
                tempIndex++;
                //AutoSizeColumns(sheet);
            }
            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;
            sheet = null;
            // headerRow = null;
            workbook = null;
            return ms;
        }

        /// <summary>
        /// 输出文件到浏览器
        /// </summary>
        /// <param name="ms">Excel文档流</param>
        /// <param name="context">HTTP上下文</param>
        /// <param name="fileName">文件名</param>
        private static void RenderToBrowser(MemoryStream ms, HttpContext context, string fileName)
        {
            if (context.Request.Browser.Browser == "IE")
                fileName = HttpUtility.UrlEncode(fileName);
            context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
            context.Response.BinaryWrite(ms.ToArray());
        }
        #endregion