FastReport.NET+.NET8高级开发篇：明细表打印图片，自动行高

 //打开选择报表界面
 frmUserCustomReport.ExecuteByDataset(nameof(DocTypeNames.PO), "PONO", owner.GetType().FullName, ds, list,
  (e) =>
  {
      //注意：FastReport.NET默认采用mm单位，要转换为像素
      var bandHeightImg = PixelMmConverter.MmToPixel(28.22f); //Band有图片高度
      var bandHeightNoImg = PixelMmConverter.MmToPixel(7.92f); //Band无图片高度
      var imageHeight = PixelMmConverter.MmToPixel(20f); //图片高度

      //图片打印事件
      var dataBand = e.Report.FindObject("Data2") as FastReport.DataBand;
      dataBand.BeforePrint += (sender, e) =>
      {
          //取出当前正在打印的记录(DataRow)。
          DataRow row = (sender as DataBand).DataSource.CurrentRow as DataRow;
          //当前Report实例
          var report = (sender as DataBand).Report;

          //获取图片PictureObject组件
          PictureObject pic = report.FindObject("picDetailImage") as PictureObject;
          TextObject txt = report.FindObject("picEmptyRow") as TextObject;
          if (pic == null) return;

          //取图片参数
          var input = new req_Images()
          {
              DocType = ImageDocType.PO.ToString(),
              DocNo = row["isid"].ToStringEx(), //主键
          };

          //从dt_Images中获取对应的图片
          var ImgSmall = new bll_Images().GetByDocType(input);
          if (ImgSmall != null)
          {
              Image img = ImageHelper.FromBytes(ImgSmall.ImgSmall);//将字节转换为图片                    
              if (pic != null) pic.Image = new Bitmap(img); //注意：必须是Bitmap, Image不受支持！
          }
          else
          {
              if (pic != null) pic.Image = null;
          }

          //自动调整行高（没有图片，要设置为默认高度)
          if (ImgSmall != null)//有图片
          {
              pic.Height = imageHeight + 2;
              txt.Height = imageHeight + 2;
              dataBand.Height = bandHeightImg;
          }
          else //无图片
          {
              pic.Height = 0;
              txt.Height = 0;
              dataBand.Height = bandHeightNoImg;
          }
      };
  },
 (e) =>
 {
     var pic = (e.Report.FindObject("Picture3") as PictureObject);
     if (pic != null)
     {
         if (Loginer.CurrentUser.DBID == nameof(DBIDs.JLM))
             pic.Image = Globals.LoadImage("StampJLM.gif");
         if (Loginer.CurrentUser.DBID == nameof(DBIDs.HD))
             pic.Image = Globals.LoadImage("StampHD.png");
     }
     ReportLib.SetCompanyReportTitle(e.Report);
 },
 (e) => { LogDB.LogData(DataLogType.print, $"打印预览【{docNo}】", nameof(tb_Plan)); },
 (e) => { new bll_PO().UpdatePrintInfo(docNo); }
 );