.net通过QRCoder生成二维码

public class ExtendFileHelper : Common.FileHelper
    {
        /// <summary>
        /// 生成二维码图片
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private Bitmap CreateQRimg(string str)
        {
            QRCodeGenerator qrGenerator = new QRCodeGenerator();
            QRCodeData qrCodeData = qrGenerator.CreateQrCode(str, QRCodeGenerator.ECCLevel.Q);
            QRCoder.QRCode qrCode = new QRCoder.QRCode(qrCodeData);
            Bitmap bt = qrCode.GetGraphic(20);

            return bt;
        }

        /// <summary>
        /// 生成二维码图片流（二维码上含文字）
        /// </summary>
        /// <param name="url">二维码中要传递的数据（地址）</param>
        /// <param name="title">二维码上显示的文字说明</param>
        public byte[] GenerateQrCode(string url, string title)
        {
            using (Image codeImage = CreateQRimg(url), strImage = ConvertStringToImage(title))
            {
                Image img = CombineImage(600, 600, codeImage, 0, 0, strImage, 0, 550);
                using (var stream = new MemoryStream())
                {
                    img.Save(stream, ImageFormat.Jpeg);
                    //输出图片流
                    return stream.ToArray();
                }
            }
        }

        /// <summary>
        /// 生成二维码图片流（二维码上含文字）
        /// </summary>
        /// <param name="str1">二维码中要传递的数据（地址）</param>
        /// <param name="str2">二维码上显示的文字说明</param>
        public Image GenerateQrCodeImg(string str1, string str2)
        {
            Image img;
            using (Image codeImage = CreateQRimg(str1), strImage = ConvertStringToImage(str2))
            {
                img = CombineImage(600, 600, codeImage, 0, 0, strImage, 0, 550);
            }
            return img;
        }

        /// <summary>
        /// 生成文字图片
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private Image ConvertStringToImage(string str)
        {
            Bitmap image = new Bitmap(600, 40, PixelFormat.Format24bppRgb);

            Graphics g = Graphics.FromImage(image);

            try
            {
                Font font = new Font("SimHei", 14, FontStyle.Regular);

                g.Clear(Color.White);

                StringFormat format = new StringFormat();
                format.Alignment = StringAlignment.Center;
                format.LineAlignment = StringAlignment.Center;

                Rectangle rectangle = new Rectangle(0, 0, 600, 40);

                g.DrawString(str, font, new SolidBrush(Color.Black), rectangle, format);

                return image;
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                GC.Collect();
            }
        }


        /// <summary>
        /// 在画板中合并二维码图片和文字图片
        /// </summary>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <param name="imgLeft"></param>
        /// <param name="imgLeft_left"></param>
        /// <param name="imgLeft_top"></param>
        /// <param name="imgRight"></param>
        /// <param name="imgRight_left"></param>
        /// <param name="imgRight_top"></param>
        /// <returns></returns>
        private Image CombineImage(int width, int height, Image imgLeft, int imgLeft_left, int imgLeft_top, Image imgRight, int imgRight_left, int imgRight_top)
        {
            Bitmap image = new Bitmap(width, height, PixelFormat.Format24bppRgb);

            Graphics g = Graphics.FromImage(image);

            try
            {
                g.Clear(Color.White);
                g.DrawImage(imgLeft, imgLeft_left, imgLeft_top, 600, 600);
                g.DrawImage(imgRight, imgRight_left, imgRight_top, imgRight.Width, imgRight.Height);

                return image;
            }
            catch (Exception e)
            {
                throw e;
            }
            finally
            {
                g.Dispose();
            }
        }
    }

 

　　输出流调用方式：

  var qrCode = new ExtendFileHelper();
  var url = "http://www.baidu.com";
  var image = qrCode.GenerateQrCode(url, "这是标题");
  Response.ClearContent();
  Response.ContentType = "image/Jpeg";
  Response.BinaryWrite(image);
  Response.Flush();

保存图片文件：

 var qrCode = new ExtendFileHelper();
 var url = "http://www.baidu.com";
 var image = qrCode.GenerateQrCodeImg(url, "这是标题");
image.Save(AppDomain.CurrentDomain.BaseDirectory+"/Upload/"+DateTime.Now.ToString("yyyyMMddHHmmss") + ".png");