C# MVC 生成带LOGO的二维码并返回到客户端

使用zxing开源库 

0积分下载地址：http://download.csdn.net/detail/hejisan/9846307

创建二维码并叠加拼合logo的QRCode.cs类：

using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using ZXing;using ZXing.QrCode;using ZXing.QrCode.Internal;namespace HalfBuy.Biz.Utilities{    public class QRCodeHelper    {        /// <summary>        /// 将图片按一定的比例压缩        /// </summary>        /// <param name="b">资源图片</param>        /// <param name="destHeight">高度</param>        /// <param name="destWidth">宽度</param>        /// <returns></returns>        public static Bitmap GetThumbnail(Bitmap b, int destHeight, int destWidth)        {            System.Drawing.Image imgSource = b;            System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat;            int sW = 0, sH = 0;            // 按比例缩放                int sWidth = imgSource.Width;            int sHeight = imgSource.Height;            if (sHeight > destHeight || sWidth > destWidth)            {                if ((sWidth * destHeight) > (sHeight * destWidth))                {                    sW = destWidth;                    sH = (destWidth * sHeight) / sWidth;                }                else                {                    sH = destHeight;                    sW = (sWidth * destHeight) / sHeight;                }            }            else            {                sW = sWidth;                sH = sHeight;            }            Bitmap outBmp = new Bitmap(destWidth, destHeight);            Graphics g = Graphics.FromImage(outBmp);            g.Clear(Color.Transparent);            // 设置画布的描绘质量                g.CompositingQuality = CompositingQuality.HighQuality;            g.SmoothingMode = SmoothingMode.HighQuality;            g.InterpolationMode = InterpolationMode.HighQualityBicubic;            g.DrawImage(imgSource, new Rectangle((destWidth - sW) / 2, (destHeight - sH) / 2, sW, sH), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);            g.Dispose();            // 以下代码为保存图片时，设置压缩质量                EncoderParameters encoderParams = new EncoderParameters();            long[] quality = new long[1];            quality[0] = 100;            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);            encoderParams.Param[0] = encoderParam;            imgSource.Dispose();            return outBmp;        }        /// <summary>        /// 生成二维码        /// </summary>        /// <param name="content">需要生成二维码的内容</param>        /// <param name="size">二维码图片长宽大小</param>        /// <returns></returns>        public static Bitmap Create(string content, int size)        {            try            {                var options = new QrCodeEncodingOptions                {                    DisableECI = true,                    CharacterSet = "UTF-8",                    Width = size,                    Height = size,                    Margin = 0,                    ErrorCorrection = ErrorCorrectionLevel.H                };                var writer = new BarcodeWriter();                writer.Format = BarcodeFormat.QR_CODE;                writer.Options = options;                var bmp = writer.Write(content);                return bmp;            }            catch (Exception ex)            {                return null;            }        }        #region 合并用户QR图片和用户头像        /// <summary>           /// 合并用户QR图片和用户头像           /// </summary>           /// <param name="qrImg">QR图片（二维码图片）</param>           /// <param name="headerImg">用户头像</param>           /// <param name="n">缩放比例</param>           /// <returns></returns>           public static Bitmap MergeQrImg(Bitmap qrImg, Bitmap headerImg, double n = 0.23)        {            int margin = 10;            float dpix = qrImg.HorizontalResolution;            float dpiy = qrImg.VerticalResolution;            var _newWidth = (10 * qrImg.Width - 46 * margin) * 1.0f / 46;            var _headerImg = ZoomPic(headerImg, _newWidth / headerImg.Width);            //处理头像               int newImgWidth = _headerImg.Width + margin;            Bitmap headerBgImg = new Bitmap(newImgWidth, newImgWidth);            headerBgImg.MakeTransparent();            Graphics g = Graphics.FromImage(headerBgImg);            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;            g.Clear(Color.Transparent);            Pen p = new Pen(new SolidBrush(Color.White));            Rectangle rect = new Rectangle(0, 0, newImgWidth - 1, newImgWidth - 1);            using (GraphicsPath path = CreateRoundedRectanglePath(rect, 7))            {                g.DrawPath(p, path);                g.FillPath(new SolidBrush(Color.White), path);            }            //画头像               Bitmap img1 = new Bitmap(_headerImg.Width, _headerImg.Width);            Graphics g1 = Graphics.FromImage(img1);            g1.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;            g1.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;            g1.Clear(Color.Transparent);            Pen p1 = new Pen(new SolidBrush(Color.Gray));            Rectangle rect1 = new Rectangle(0, 0, _headerImg.Width - 1, _headerImg.Width - 1);            using (GraphicsPath path1 = CreateRoundedRectanglePath(rect1, 7))            {                g1.DrawPath(p1, path1);                TextureBrush brush = new TextureBrush(_headerImg);                g1.FillPath(brush, path1);            }            g1.Dispose();            PointF center = new PointF((newImgWidth - _headerImg.Width) / 2, (newImgWidth - _headerImg.Height) / 2);            g.DrawImage(img1, center.X, center.Y, _headerImg.Width, _headerImg.Height);            g.Dispose();            Bitmap backgroudImg = new Bitmap(qrImg.Width, qrImg.Height);            backgroudImg.MakeTransparent();            backgroudImg.SetResolution(dpix, dpiy);            headerBgImg.SetResolution(dpix, dpiy);            Graphics g2 = Graphics.FromImage(backgroudImg);            g2.Clear(Color.Transparent);            g2.DrawImage(qrImg, 0, 0);            PointF center2 = new PointF((qrImg.Width - headerBgImg.Width) / 2, (qrImg.Height - headerBgImg.Height) / 2);            g2.DrawImage(headerBgImg, center2);            g2.Dispose();            return backgroudImg;        }        #endregion        #region 图形处理        /// <summary>           /// 创建圆角矩形           /// </summary>           /// <param name="rect">区域</param>           /// <param name="cornerRadius">圆角角度</param>           /// <returns></returns>           private static GraphicsPath CreateRoundedRectanglePath(Rectangle rect, int cornerRadius)        {            //下午重新整理下，圆角矩形               GraphicsPath roundedRect = new GraphicsPath();            roundedRect.AddArc(rect.X, rect.Y, cornerRadius * 2, cornerRadius * 2, 180, 90);            roundedRect.AddLine(rect.X + cornerRadius, rect.Y, rect.Right - cornerRadius * 2, rect.Y);            roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y, cornerRadius * 2, cornerRadius * 2, 270, 90);            roundedRect.AddLine(rect.Right, rect.Y + cornerRadius * 2, rect.Right, rect.Y + rect.Height - cornerRadius * 2);            roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y + rect.Height - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 0, 90);            roundedRect.AddLine(rect.Right - cornerRadius * 2, rect.Bottom, rect.X + cornerRadius * 2, rect.Bottom);            roundedRect.AddArc(rect.X, rect.Bottom - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 90, 90);            roundedRect.AddLine(rect.X, rect.Bottom - cornerRadius * 2, rect.X, rect.Y + cornerRadius * 2);            roundedRect.CloseFigure();            return roundedRect;        }        /// <summary>           /// 图片按比例缩放           /// </summary>           private static Image ZoomPic(Image initImage, double n)        {            //缩略图宽、高计算               double newWidth = initImage.Width;            double newHeight = initImage.Height;            newWidth = n * initImage.Width;            newHeight = n * initImage.Height;            //生成新图               //新建一个bmp图片               System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);            //新建一个画板               System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);            //设置质量               newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;            newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;            //置背景色               newG.Clear(Color.Transparent);            //画图               newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);            newG.Dispose();            return newImage;        }        #endregion    }}

MVC  C#控制器方法生成url二维码及从网络请求logo的Action:

 public FileResult GetImage()        {            string myshareurl = Config.ShareUrl;//+ UserService.myShareParameter();            string content = myshareurl;            Bitmap bitmap = QRCodeHelper.Create(content, 400);            string filename = DateTime.Now.ToFileTime().ToString();            Uri uri = new Uri(UserService.SessionUser.headimgurl);            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(uri);            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();            System.IO.Stream resStream = response.GetResponseStream();            Bitmap sourcebm = new Bitmap(resStream);//初始化Bitmap图片            Bitmap qrAndHeaderBitmap = QRCodeHelper.MergeQrImg(bitmap, sourcebm);            System.IO.MemoryStream ms = new System.IO.MemoryStream();            qrAndHeaderBitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);              //qrAndHeaderBitmap.Save(saveFileUrl, System.Drawing.Imaging.ImageFormat.Png);            qrAndHeaderBitmap.Dispose(); //释放资源              bitmap.Dispose();            return new FileContentResult(ms.ToArray(), "image/Png");            //or like below               //MemoryStream mem = new MemoryStream(image, 0, image.Length);               //return new FileStreamResult(mem, "image/jpg");        }

MVC 视图请求图片：

<img id="img" src="/User/GetImage" />

Over!