NPOI向Excel文件插入图片

 byte[] Content = new byte[Convert.ToInt32(fs.Length)];
 fs.Read(Content, 0, Convert.ToInt32(fs.Length));
 int pictureIdx = hssfworkbookDown.AddPicture(Content,NPOI.SS.UserModel.PictureType.JPEG);
 HSSFPatriarch patriarch = (HSSFPatriarch)sheet1.CreateDrawingPatriarch();
 //##处理照片位置，【图片左上角为（6, 2）第2+1行6+1列，右下角为（8, 6）第6+1行8+1列】
 HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0,0, 6, 2, 8, 6);
 HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);