对Excel.dll 再次封装，利用IDpose接口，释放Excel进程；自动读取Excel单元格的内容到System.data.dataTable，比传统读取...

代码说明：

对Excel.dll 再次封装，利用IDpose接口，释放Excel进程；自动读取Excel单元格的内容到System.data.dataTable，比传统读取的效率有提高；利用DataTable中的计算结果，再写回到Excel中，生成.xls 报告文件-Re-packaging of the Excel.dll using IDpose interface, the release of Excel process automatically read the contents of Excel cells into System.data.dataTable, the efficiency than the traditional reading has been improved the use of DataTable in the calculations, write back Excel, generate. xls report file