C#Excl表格的导入功能

1,添加NOPI的引用

下载地址:http://download-codeplex.sec.s-msft.com/Download/Release?ProjectName=npoi&DownloadId=1432518&FileTime=130691232697500000&Build=21066

2,添加命名空间

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

/// <summary>
        /// 导入
       /// </summary>
       /// <returns></returns>
        public ActionResult ImportExcel()
        {
            Dictionary<String, Object> result = new Dictionary<String, Object>();
            StringBuilder errorMsg = new StringBuilder(); // 错误信息
            try
            {
                string tempFile = Server.MapPath("~/ExcelFiles/");//路径
                string repath = Request["repath"];

                //将Excel文件上传到本地服务器
                HttpPostedFileBase uploadFile = Request.Files[repath];// 获取上传的文件
                var filePath = string.Format("{0}{1}", tempFile, uploadFile.FileName); // 上传服务器的文件保存路径
                uploadFile.SaveAs(filePath);//保存文件

                ////Excel文档流转换成DataTable
                DataTable dt = ExcelToDataTable(filePath, true);

                // 将数据存储到数据库
                AidMeasureService.ExcelDataSave(dt);

                //将上传的文件删除
                System.IO.FileInfo nfile = new System.IO.FileInfo(filePath);
                if (nfile.Exists)
                {
                    nfile.Delete();
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog("MeasureController.ImportExcel()", ex);
                result.Add("Success", false);
                result.Add("ErrorInfo", ex.ToString());
                return Json(result);
            }
            result.Add("Success", true);
            return Json(result);
        }

        /// <summary>
        /// 将excel导入到datatable
        /// </summary>
        /// <param name="filePath">excel路径</param>
        /// <param name="isColumnName">第一行是否是列名</param>
        /// <returns>返回datatable</returns>
        public DataTable ExcelToDataTable(string filePath, bool isColumnName)
        {
            DataTable dataTable = null;
            FileStream fs = null;
            DataColumn column = null;
            DataRow dataRow = null;
            IWorkbook workbook = null;
            ISheet sheet = null;
            IRow row = null;
            ICell cell = null;
            int startRow = 0;
            try
            {
                using (FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                {
                    // 2007版本
                    if (filePath.IndexOf(".xlsx") > 0)
                        workbook = new XSSFWorkbook(stream);
                    // 2003版本
                    else if (filePath.IndexOf(".xls") > 0)
                        workbook = new HSSFWorkbook(stream);

                    if (workbook != null)
                    {
                        sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet
                        dataTable = new DataTable();
                        if (sheet != null)
                        {
                            int rowCount = sheet.LastRowNum;//总行数
                            if (rowCount > 0)
                            {
                                IRow firstRow = sheet.GetRow(0);//第一行
                                int cellCount = firstRow.LastCellNum;//列数  

                                //构建datatable的列
                                if (isColumnName)
                                {
                                    startRow = 1;//如果第一行是列名，则从第二行开始读取
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        cell = firstRow.GetCell(i);
                                        if (cell != null)
                                        {
                                            if (cell.StringCellValue != null)
                                            {
                                                column = new DataColumn(cell.StringCellValue);
                                                dataTable.Columns.Add(column);
                                            }
                                        }
                                    }
                                }
                                else
                                {
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        column = new DataColumn("column" + (i + 1));
                                        dataTable.Columns.Add(column);
                                    }
                                }

                                //填充行
                                for (int i = startRow; i <= rowCount; ++i)
                                {
                                    row = sheet.GetRow(i);
                                    if (row == null) continue;

                                    dataRow = dataTable.NewRow();
                                    for (int j = row.FirstCellNum; j < cellCount; ++j)
                                    {
                                        cell = row.GetCell(j);
                                        if (cell == null)
                                        {
                                            dataRow[j] = "";
                                        }
                                        else
                                        {
                                            //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
                                            switch (cell.CellType)
                                            {
                                                case CellType.BLANK:
                                                    dataRow[j] = "";
                                                    break;
                                                case CellType.NUMERIC:
                                                    short format = cell.CellStyle.DataFormat;
                                                    //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理
                                                    if (format == 14 || format == 31 || format == 57 || format == 58)
                                                        dataRow[j] = cell.DateCellValue;
                                                    else
                                                        dataRow[j] = cell.NumericCellValue;
                                                    break;
                                                case CellType.STRING:
                                                    dataRow[j] = cell.StringCellValue;
                                                    break;
                                            }
                                        }
                                    }
                                    dataTable.Rows.Add(dataRow);
                                }
                            }
                        }
                    }
                }
                return dataTable;
            }
            catch (Exception)
            {
                if (fs != null)
                {
                    fs.Close();
                }
                return null;
            }
        }

原文地址：https://www.cnblogs.com/namexiaoqi/p/8005805.html