常用NPOI导出数据到excel，但没有试过如何导出图片。NPOI最大的特点就是不依赖于Excel组件，服务端不需要安装Excel。在单元格中插入图片主要是用HSSFClientAnchor对象。他有8个参数。

HSSFClientAnchor anchor = new HSSFClientAnchor(dx1, dy1, dx2, dy2, col1, row1, col2, row2);

前面四个表示在单元格中两个点的位置，后面四个表示是哪个单元格。先看代码。

public FileResult ExportAppsImg()        {            using (var db=new PortalDb())            {             HSSFWorkbook workbook = new HSSFWorkbook();            //创建一个sheet            ISheet sheet1 = workbook.CreateSheet("sheet1");            // 设置列宽,excel列宽每个像素是1/256            sheet1.SetColumnWidth(0, 18 * 256);            sheet1.SetColumnWidth(1, 18 * 256);            IRow rowHeader = sheet1.CreateRow(0);//创建表头行            rowHeader.CreateCell(0, CellType.STRING).SetCellValue("生产单号");            rowHeader.CreateCell(1, CellType.STRING).SetCellValue("学/工号");            rowHeader.CreateCell(2, CellType.STRING).SetCellValue("手机号");            rowHeader.CreateCell(3, CellType.STRING).SetCellValue("单位");            rowHeader.CreateCell(4, CellType.STRING).SetCellValue("预约类型");            rowHeader.CreateCell(5, CellType.STRING).SetCellValue("车牌号");            rowHeader.CreateCell(6, CellType.STRING).SetCellValue("颜色");            rowHeader.CreateCell(7, CellType.STRING).SetCellValue("品牌");            rowHeader.CreateCell(8, CellType.STRING).SetCellValue("工作证");          //  rowHeader.CreateCell(9, CellType.STRING).SetCellValue("身份证正面");           // rowHeader.CreateCell(10, CellType.STRING).SetCellValue("身份证反面");            rowHeader.CreateCell(9, CellType.STRING).SetCellValue("驾驶证正面");            rowHeader.CreateCell(10, CellType.STRING).SetCellValue("驾驶证反面");            rowHeader.CreateCell(11, CellType.STRING).SetCellValue("结婚证");            rowHeader.CreateCell(12, CellType.STRING).SetCellValue("状态");            rowHeader.CreateCell(13, CellType.STRING).SetCellValue("预约时间");            rowHeader.CreateCell(14, CellType.STRING).SetCellValue("申请时间");            var res = db.Appointments.ToList();            if (res.Count > 0)            {                int rowline = 1;//从第二行开始(索引从0开始)                HSSFPatriarch patriarch = (HSSFPatriarch)sheet1.CreateDrawingPatriarch();                for (int i = 0; i < res.Count; i++)                {                    IRow row = sheet1.CreateRow(rowline);                    //设置行高 ,excel行高度每个像素点是1/20                    row.Height = 80 * 20;                    //填入生产单号                    row.CreateCell(0, CellType.STRING).SetCellValue(res[i].Name);                    row.CreateCell(1, CellType.STRING).SetCellValue(res[i].SchoolNumber);                    row.CreateCell(2, CellType.STRING).SetCellValue(res[i].Mobile);                    row.CreateCell(3, CellType.STRING).SetCellValue(res[i].School);                    row.CreateCell(4, CellType.STRING).SetCellValue(GetEnumTxt(res[i].AppointmentType));                    row.CreateCell(5, CellType.STRING).SetCellValue(res[i].CardNumber);                    row.CreateCell(6, CellType.STRING).SetCellValue(res[i].Color);                    row.CreateCell(7, CellType.STRING).SetCellValue(res[i].Brand);                    //将图片文件读入一个字符串                    setPic(workbook,patriarch, res[i].WrokImg, sheet1, rowline, 8);                   // setPic(workbook, patriarch, res[i].IDCardImg, sheet1, rowline, 9);                    //setPic(workbook, patriarch, res[i].IDCardImgBack, sheet1, rowline, 10);                    setPic(workbook, patriarch, res[i].DriveCardImg, sheet1, rowline, 9);                    setPic(workbook, patriarch, res[i].DriveCardImgBack, sheet1, rowline, 10);                    setPic(workbook, patriarch, res[i].MarryCardImg, sheet1, rowline, 11);                    row.CreateCell(12, CellType.STRING).SetCellValue((GetEnumTxt(res[i].State)));                    row.CreateCell(13, CellType.STRING).SetCellValue(res[i].VerifyTime.ToString());                    row.CreateCell(14, CellType.STRING).SetCellValue(res[i].CreateTime.ToString());                    rowline++;                }            }            var path = Server.MapPath("/Content/Excel/预约申请表.xls");            //把文件保存到d:\aaa.xls，注意扩展名是.xls不要写成.xlsx            using (Stream stream = System.IO.File.OpenWrite(path))             {                workbook.Write(stream);            }            return File(path, "application/vnd.ms-excel","预约申请表.xls");            }        }        //获取枚举类型的Display特性的name值        public string GetEnumTxt(Enum eEnum)        {            var enumType = eEnum.GetType();            var field = enumType.GetField(eEnum.ToString());            var display = field.GetCustomAttributes(typeof(DisplayAttribute), false).FirstOrDefault() as DisplayAttribute;            return display != null ? display.Name : eEnum.ToString();        }        private void setPic(HSSFWorkbook workbook, HSSFPatriarch patriarch,string path, ISheet sheet, int rowline, int col)        {            if(string.IsNullOrEmpty(path))return;            byte[] bytes = System.IO.File.ReadAllBytes(Server.MapPath(path));            int pictureIdx = workbook.AddPicture(bytes, PictureType.JPEG);            // 插图片的位置  HSSFClientAnchor（dx1,dy1,dx2,dy2,col1,row1,col2,row2) 后面再作解释            HSSFClientAnchor anchor = new HSSFClientAnchor(70, 10, 0, 0, col, rowline, col+1, rowline + 1);            //把图片插到相应的位置            HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);        }

 

每一张表只能有一个HSSFPatriarch对象，如果把它的创建放到了setPic方法中，那么一行只会出现一张图片，最后的图片会消掉之前的图片。也不能放到for循环里。所以放在最上面。再界面上方一个a标签即可下载：

导出

效果图：

参考博客：

 -- NPOI使用手册