生成二维码图片

string Name = "";
            string imgFile = "";
            if (prmember != null)
            {
                Name = prmember.Name;
            }
            string path = "/m-wap/HGProduct/ProductDetails?PID=" + prmember.ID + "";
            string url = CreatUrl(path);
            ErcodeInfo info = new ErcodeInfo();
            info.ID = id;
            info.Name = Name;
            info.Til = Name+"二维码";
            info.URL = url;
            byte[] data = GenerRideCode.ShowImg(info);
            return File(data, "image/Png");

　　

 public class GenerRideCode
    {
        /// <summary>
        /// 转换成流的形式
        /// </summary>
        /// <param name="matrix"></param>
        /// <returns></returns>
        public static Bitmap toBitmap(ByteMatrix matrix)
        {
            int width = matrix.Width;
            int height = matrix.Height;
            Bitmap bmap = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            for (int x = 0; x < width; x++)
            {
                for (int y = 0; y < height; y++)
                {
                    bmap.SetPixel(x, y, matrix.get_Renamed(x, y) != -1 ? ColorTranslator.FromHtml("0xFF000000") : ColorTranslator.FromHtml("0xFFFFFFFF"));
                }
            }
            return bmap;
        }

        public static string UpLoadImg(ErcodeInfo info, HttpServerUtilityBase Server1)
        {
            ByteMatrix byteMatrix = new MultiFormatWriter().encode(info.URL, BarcodeFormat.QR_CODE, 600, 700);
            Bitmap bitmap = GenerRideCode.toBitmap(byteMatrix);

            int width = bitmap.Width, height = bitmap.Height;
            Graphics g = Graphics.FromImage(bitmap);
            g.DrawImage(bitmap, 0, 0);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.DrawImage(bitmap, new Rectangle(0, 0, width, height), 0, 30, width, height, GraphicsUnit.Pixel);
            Font crFont = new Font("微软雅黑", 30, FontStyle.Bold);

            SizeF crSize = new SizeF();
            string text = info.Name;

            crSize = g.MeasureString(text, crFont);
            //SolidBrush semiTransBrush = new SolidBrush(Color.Green);
            SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(255, 0, 0, 0));
            //将原点移动 到图片中点
            g.TranslateTransform((600 - crSize.Width) / 2, 580);
            //以原点为中心 转 -45度
            g.RotateTransform(0);
            g.DrawString(text, crFont, semiTransBrush, new PointF(0, 0));


            g.TranslateTransform(-(600 - crSize.Width) / 2, -580);
            crSize = g.MeasureString(info.Til, crFont);
            g.TranslateTransform((600 - crSize.Width) / 2, 630);
            g.DrawString(info.Til, crFont, semiTransBrush, new PointF(0, 0));//"产品展示二维码"

            string imgFile = "/Storage/UserImage/" + info.ID + ".jpg";
            string tFullName = Server1.MapPath(imgFile);
            bitmap.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);
            return imgFile;
        }

        public static byte[] ShowImg(ErcodeInfo info)
        {
            ByteMatrix byteMatrix = new MultiFormatWriter().encode(info.URL, BarcodeFormat.QR_CODE, 400, 459);
            Bitmap bitmap = GenerRideCode.toBitmap(byteMatrix);

            int width = bitmap.Width, height = bitmap.Height;
            Graphics g = Graphics.FromImage(bitmap);
            g.DrawImage(bitmap, 0, 0);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.DrawImage(bitmap, new Rectangle(0, 0, width, height), 0, 30, width, height, GraphicsUnit.Pixel);
            Font crFont = new Font("微软雅黑", 16, FontStyle.Bold);
            SizeF crSize = new SizeF();
            string text = info.ID.ToString();
            crSize = g.MeasureString(text, crFont);
            SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(255, 0, 0, 0));
            //将原点移动 到图片中点
            g.TranslateTransform((400 - crSize.Width) / 2, 380);
            //以原点为中心 转 -45度
            g.RotateTransform(0);
            g.DrawString(text, crFont, semiTransBrush, new PointF(0, 0));


            g.TranslateTransform(-(400 - crSize.Width) / 2, -380);
            crSize = g.MeasureString(info.Til, crFont);
            g.TranslateTransform((400 - crSize.Width) / 2, 410);
            g.DrawString(info.Til, crFont, semiTransBrush, new PointF(0, 0));

            //在本地生成二维码图片
            //string filename = @"E:卓立信息备份generate1.png";
            //bitmap.Save(filename, ImageFormat.Png);
            //用流的形式把图片显示在前台的img标签中
            byte[] data;
            using (MemoryStream stream = new MemoryStream())
            {
                bitmap.Save(stream, ImageFormat.Png);
                data = new byte[stream.Length];
                stream.Seek(0, SeekOrigin.Begin);
                stream.Read(data, 0, Convert.ToInt32(stream.Length));
            }
            return data;
        }


    }

　　

 /// <summary>
        /// 生成二维码url
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        private string CreatUrl(string path)
        {
            string AbsoluteUri;
            string domain;
            string allurl = Request.Url.ToString();
            var xy = allurl.Split(':');
            AbsoluteUri = xy[0];
            domain = System.Web.HttpContext.Current.Request.Url.Host;
            int? port = Request.Url.Port;
            if (port != null && port != 80)
            {
                domain += ":" + port;
            }
            string url = AbsoluteUri + "://" + domain + path;
            return url;
        }