C# .NET 使用 NPOI 生成 .xlsx 格式 Excel

 IWorkbook workbook = new XSSFWorkbook();
 ISheet sheet = workbook.CreateSheet("-");
 IRow row = sheet.CreateRow();//标题

 IRow titleRow = row.CreateCell();
 Row.SetCellValue("标题列1");

 IRow dataRow = sheet.CreateRow();
 dataRow.CreateCell().SetCellValue(“第一行第一列数值”);

 string fileName = "demo.xlsx";

 FileStream file = new FileStream("C:\\Desktop\\" + fileName, FileMode.Create);//把这个HSSFWorkbook实例写入文件
 workbook.Write(file);
 file.Close();

 /*如果此处要下载*/
 //MemoryStream ms = new MemoryStream();
 //workbook.Write(ms);