NPOI支持excel2003和excel2007

 

 IWorkbook wk = null;
if (filePath.ToLower() == ".xls")
{
   wk = new HSSFWorkbook(fs);
}
else
{
  wk = new XSSFWorkbook(fs);
}
                     

ps:对象HSSFWorkbook支持excel2003

　  对象HSSFWorkbook支持excel2007