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：
效果图：
参考博客：
-- NPOI使用手册