NOPI Excel

代码说明：

一个比较好用的Excel处理类库 private void button1_Click(object sender, EventArgs e)        {            HSSFWorkbook hssfworkbook = new HSSFWorkbook();            HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.CreateSheet("测试");            //HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.CreateSheet("Sheet1");            HSSFSheet sheet2 = (HSSFSheet)hssfworkbook.CreateSheet("Sheet2");            HSSFSheet sheet3 = (HSSFSheet)hssfworkbook.CreateSheet("Sheet3");