C#使用NPOI上传excel

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

 public DataTable GetexcelDataSet(string path, Stream fs)  {   IWorkbook workbook = null;   if (path.IndexOf(".xlsx") > 0)   {    workbook = new XSSFWorkbook(fs);//excel的版本2007   }   else if (path.IndexOf(".xls") > 0)   {    workbook = new HSSFWorkbook(fs);//excel的版本2003   }   ISheet sheet = workbook.GetSheetAt(0);//得到第一张表   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   for (int i = headerRow.FirstCellNum; i < cellCount; i++)   {    DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);    table.Columns.Add(column);//添加行标题   }   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] = row.GetCell(j);     }    }    table.Rows.Add(dataRow);   }   return table;  }