FileStream fileStream = new FileStream(@FileName, FileMode.Open, FileAccess.Read);

FileStream fileStream2;

if (FileName.IndexOf(".xlsx") > ) // 2007版本

{

workbook1 = new XSSFWorkbook(fileStream); //xlsx数据读入workbook

}

else if (FileName.IndexOf(".xls") > ) // 2003版本

{

workbook1 = new HSSFWorkbook(fileStream); //xls数据读入workbook

}

ISheet sheet = workbook1.GetSheetAt(); //获取第一个工作表

IRow row = sheet.GetRow();

row.Height =  * ;

using (fileStream2 = File.OpenWrite(FileName))

{

workbook1.Write(fileStream2);//向打开的这个xls文件中写入数据

}

fileStream.Close();

workbook1.Close();

fileStream2.Close();

fileStream2.Dispose();