DataTable数据导出保存到文件、Excel文件导入到DataTable

 一、DataTable转换成Excel表格,导出保存到文件

        // GET: /Excel/
        Models.zbwxglEntities myMdl = new Models.zbwxglEntities();
        /// 
        /// 第一种方法,利用文件输出流进行读写操作
        /// 
        public void outExcel(DataTable table)
        {
            DataTable dtData = table;
            string shtnl = "";
            shtnl = "";
            shtnl = shtnl + "";
            for (int j = 0; j < dtData.Columns.Count; j++)
            {
                shtnl = shtnl + "";
            }
            shtnl = shtnl + "";
            for (int i = 0; i < dtData.Rows.Count; i++)
            {
                shtnl = shtnl + "";
                for (int j = 0; j < dtData.Columns.Count; j++)
                {
                        shtnl = shtnl + "";
                }
                shtnl = shtnl + "";
            }
            shtnl = shtnl + "
" + j + "
" + dtData.Rows[i][j] + "
"; ExportToExcel("application/x-excel", "1234.xls", shtnl); } public void ExportToExcel(string FieldType, string FileName, string dt) { System.Web.HttpContext.Current.Response.Charset = "utf-8"; System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8).ToString()); System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); System.Web.HttpContext.Current.Response.ContentType = FieldType; StringWriter tw = new StringWriter(); System.Web.HttpContext.Current.Response.Output.Write(dt); System.Web.HttpContext.Current.Response.Flush(); System.Web.HttpContext.Current.Response.End(); } /// /// 第二种方法,利用微软自带插件 /// /// public ActionResult DownloadFile(DataTable table) { try { DataTable dt = table; string strdate = DateTime.Now.ToString("yyyyMMddhhmmss"); string str = Server.HtmlEncode(Request.PhysicalApplicationPath).ToString() + "Content\\DownLoadTest\\" + Session["YongHuID"] + strdate + "Excel.xls"; if (System.IO.File.Exists(str)) { //如果存在则删除 System.IO.File.Delete(str); } ConvertHelper myConvertHelper = new ConvertHelper(); DataTableToExcel(dt, str);//将DataTable数据转换成Excel数据 System.Threading.Thread.Sleep(5000); return File(str, "application/vnd.ms-excel", strdate + "12345.xls"); } catch { DataTable dt = new DataTable(); List> ListReturn = ConvertHelper.DtToList(dt); return Json(ListReturn, JsonRequestBehavior.AllowGet); } } public void DataTableToExcel(DataTable datas, string p) { Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application(); app.SheetsInNewWorkbook = 1; app.Workbooks.Add(); Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)app.ActiveWorkbook.Worksheets[1]; for (int i = 0; i < datas.Columns.Count; i++) { sheet.Cells[1, i + 1] = datas.Columns[i].ColumnName; } for (int i = 0; i < datas.Rows.Count; i++) { for (int j = 0; j < datas.Columns.Count; j++) { sheet.Cells[2 + i, j + 1] = datas.Rows[i][j].ToString(); } } app.Visible = true; System.Threading.Thread.Sleep(500); try { app.ActiveWorkbook.SaveAs(p); } catch { } app.Quit(); } /// /// 第三种方法,利用NPOI插件 /// /// public FileResult DownLoadExcelJiZuChaXunGenRenXiaoFeiJiLu(DataTable table) { DataTable dt = table;//获取需要导出的datatable数据 //创建Excel文件的对象 NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); //添加一个sheet NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1"); //给sheet1添加第一行的头部标题 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0); //row1.RowStyle.FillBackgroundColor = ""; for (int i = 0; i < dt.Columns.Count; i++) { row1.CreateCell(i).SetCellValue(dt.Columns[i].ColumnName); } //将数据逐步写入sheet1各个行 for (int i = 0; i < dt.Rows.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { rowtemp.CreateCell(j).SetCellValue(dt.Rows[i][j].ToString().Trim()); } } string strdate = DateTime.Now.ToString("yyyyMMddhhmmss");//获取当前时间 // 写入到客户端 System.IO.MemoryStream ms = new System.IO.MemoryStream(); book.Write(ms); ms.Seek(0, SeekOrigin.Begin); return File(ms, "application/vnd.ms-excel", strdate + "Excel.xls"); }

二、Excel数据导入DataTable

        /// 
        /// Excel导入
        /// 
        /// 
        public ActionResult GetTableFromExcel()
        {
            //FileStream file = new FileStream(Server.HtmlEncode(Request.PhysicalApplicationPath).ToString() + "excel\\123.xlsx", FileMode.Open, FileAccess.Read);
 
            HttpPostedFileBase fostFile = Request.Files["file1"];
            Stream streamfile = fostFile.InputStream;
            //HSSFWorkbook hssfworkbook = new HSSFWorkbook(streamfile);
            HSSFWorkbook hssfworkbook = new HSSFWorkbook(streamfile);
            using (NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0))
            {
                DataTable table = new DataTable();
                IRow headerRow = sheet.GetRow(0);//第一行为标题行
                int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells
                int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1
                //handling header.
                for (int i = headerRow.FirstCellNum; i < cellCount; i++)
                {
                    DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
                    table.Columns.Add(column);
                }
                for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
                {
                    IRow row = sheet.GetRow(i);
                    DataRow dataRow = table.NewRow();
                    if (row != null)
                    {
                        for (int j = row.FirstCellNum; j < cellCount; j++)
                        {
                            if (row.GetCell(j) != null)
                                dataRow[j] = GetCellValue(row.GetCell(j));
                        }
                    }
                    table.Rows.Add(dataRow);
                }
                for (int i = 0; i < table.Rows.Count; i++)
                {
                    //myUpLoadBLL.ForDownLoad(table.Rows[i][1].ToString(), table.Rows[i][2].ToString(),Convert.ToBoolean( table.Rows[i][3]));
                }
            }
            return Content("");
        }
        /// 
        /// 根据Excel列类型获取列的值
        /// 
        /// Excel列
        /// 
        private static string GetCellValue(ICell cell)
        {
            if (cell == null)
                return string.Empty;
            switch (cell.CellType)
            {
                case CellType.BLANK:
                    return string.Empty;
                case CellType.BOOLEAN:
                    return cell.BooleanCellValue.ToString();
                case CellType.ERROR:
                    return cell.ErrorCellValue.ToString();
                case CellType.NUMERIC:
                case CellType.Unknown:
                default:
                    return cell.ToString();
                case CellType.STRING:
                    return cell.StringCellValue;
                case CellType.FORMULA:
                    try
                    {
                        HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
                        e.EvaluateInCell(cell);
                        return cell.ToString();
                    }
                    catch
                    {
                        return cell.NumericCellValue.ToString();
                    }
            }
        }

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