excel 导入

  public static DataTable ExcelToDataTable(string fileName, string sheetName, bool isFirstRowColumn)
         {
             IWorkbook workbook = null;
             ISheet sheet = null;
             DataTable data = new DataTable("DataTable");
             int startRow = ;

             string fileExt = Path.GetExtension(fileName);    //获取文件的后缀名
             FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
             if (fileExt == ".xlsx") // 2007版本
             {
                 workbook = new XSSFWorkbook(fs);
             }
             else if (fileExt == ".xls") // 2003版本
             {
                 workbook = new HSSFWorkbook(fs);
             }
             if (sheetName != null)
             {
                 sheet = workbook.GetSheet(sheetName);
                 if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
                 {
                     sheet = workbook.GetSheetAt();
                 }
             }
             else
             {
                 sheet = workbook.GetSheetAt();
             }
             if (sheet != null)
             {
                 IRow firstRow = sheet.GetRow();
                 int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
                 if (isFirstRowColumn)
                 {
                     for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                     {
                         ICell cell = firstRow.GetCell(i);
                         if (cell != null)
                         {
                             string cellValue = cell.StringCellValue;
                             if (cellValue != null)
                             {
                                 DataColumn column = new DataColumn(cellValue);
                                 data.Columns.Add(column);
                             }
                         }
                     }
                     startRow = sheet.FirstRowNum + ;
                 }
                 else
                 {
                     startRow = sheet.FirstRowNum;
                 }
                 //最后一列的标号
                 int rowCount = sheet.LastRowNum;
                 DataRow dataRow;
                 for (int i = startRow; i <= rowCount; ++i)
                 {
                     IRow row = sheet.GetRow(i);
                     if (row == null)
                     {
                         continue; //没有数据的行默认是null　　
                     }
                     dataRow = data.NewRow();
                     for (int j = row.FirstCellNum; j < cellCount; ++j)
                     {
                         if (row.GetCell(j).CellType == CellType.Numeric)
                         {
                             dataRow[j] = row.GetCell(j).NumericCellValue;
                         }
                         else
                         {
                             dataRow[j] = row.GetCell(j).ToString();
                         }
                     }
                     data.Rows.Add(dataRow);
                 }
             }
             return data;
         }

调用：

  dt = ExcelHelper.ExcelToDataTable(txtFilePath.Text, "", true);

//txtFilePath.Text：上传路径
上传：

 private void btnOpen_Click(object sender, EventArgs e)
         {
             OpenFileDialog fileDialog = new OpenFileDialog();
             fileDialog.Title = "请打开Excel文件";
             fileDialog.Filter = "(EXCEL 文件)|*.xls;*.xlsx"; //设置要选择的文件的类型
             if (fileDialog.ShowDialog() == DialogResult.OK)
             {
                 txtFilePath.Text = fileDialog.FileName;//返回文件的完整路径
             }
         }