/// <summary>
        /// 生成床位二维码
        /// </summary>
        /// <returns></returns>
        public static Image BedNoEwm()
        {
            string level = "L";
            QRCodeGenerator.ECCLevel eccLevel = (QRCodeGenerator.ECCLevel)(level == "L" ? 0 : level == "M" ? 1 : level == "Q" ? 2 : 3);
            //二维码 扫出来的内容
            string JosnStr = "";
            using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
            using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(JosnStr, eccLevel))
            using (QRCode qrCode = new QRCode(qrCodeData))
            {
   
                //二维码 中间的图片
                System.Drawing.Image image = System.Drawing.Image.FromFile(System.IO.Directory.GetCurrentDirectory() + "\\wpf_image" + "\\log_1.png");
                System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(image);
                Bitmap b = qrCode.GetGraphic(3, System.Drawing.Color.Black, System.Drawing.Color.FromArgb(0xff, 247, 247, 247),
                  bmp, 15);

                 //二维码下面写文字
                //b = InsertWords(b, "1楼A001房01床");
                oryStream ms = new MemoryStream();

                b.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
                byte[] bytes = ms.GetBuffer();
                ms.Close();
                return PrintImage.BytesToImage(bytes);
            }
        }

        /// <summary>
        /// 二维码下面加上文字
        /// </summary>
        /// <param name="qrImg">QR图片</param>
        /// <param name="content">文字内容</param>
        /// <param name="n"></param>
        /// <returns></returns>
        public static Bitmap InsertWords(Bitmap qrImg, string content)
        {
            Bitmap backgroudImg = new Bitmap(qrImg.Width, qrImg.Height);
            backgroudImg.MakeTransparent();
            Graphics g2 = Graphics.FromImage(backgroudImg);
            g2.Clear(Color.Transparent);
            //画二维码到新的面板上
            g2.DrawImage(qrImg, 0, 0);

            if (!string.IsNullOrEmpty(content))
            {
                FontFamily fontFamily = new FontFamily("楷体");
                Font font1 = new Font(fontFamily, 10f, FontStyle.Bold, GraphicsUnit.Pixel);

                //文字长度 
                int strWidth = (int)g2.MeasureString(content, font1).Width;
                //总长度减去文字长度的一半  （居中显示）
                int wordStartX = (qrImg.Width - strWidth) / 2;
                int wordStartY = qrImg.Height - 12;

                g2.DrawString(content, font1, Brushes.Black, wordStartX, wordStartY);
            }

            g2.Dispose();
            
            return backgroudImg;
        }

　　效果：