1 IWorkbook workbook = new XSSFWorkbook();
 2 ISheet sheet = workbook.CreateSheet("-");
 3 IRow row = sheet.CreateRow(0);//标题
 4 
 5 IRow titleRow = row.CreateCell(0);
 6 Row.SetCellValue("标题列1");
 7 
 8 IRow dataRow = sheet.CreateRow(1);
 9 dataRow.CreateCell(0).SetCellValue(“第一行第一列数值”);
10 
11 string fileName = "demo.xlsx";
12 
13 FileStream file = new FileStream("C:\\Desktop\\" + fileName, FileMode.Create);//把这个HSSFWorkbook实例写入文件
14 workbook.Write(file);
15 file.Close();
16 
17 /*如果此处要下载*/
18 //MemoryStream ms = new MemoryStream();
19 //workbook.Write(ms);