C# 生成中间含有LOGO的二维码

效果如下：

1、无LOGO的二维码：

2、含有LOGO的二维码：

一、下载QrCode程序集：

使用的程序集有：

下载地址：

http://zxingnet.codeplex.com/

二、QRCodeHelper 工具类：

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using ZXing;

using ZXing.QrCode;

using ZXing.QrCode.Internal;

namespace Test.One.Common

{

    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 = , sH = ;

            // 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) / , (destHeight - sH) / , sW, sH), , , 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[];

            quality[] = ;

            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

            encoderParams.Param[] = 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 = ,

                    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 = ;

            float dpix = qrImg.HorizontalResolution;

            float dpiy = qrImg.VerticalResolution;

            var _newWidth = ( * qrImg.Width -  * margin) * 1.0f / ;

            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(, , newImgWidth - , newImgWidth - );

            using (GraphicsPath path = CreateRoundedRectanglePath(rect, ))

            {

                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(, , _headerImg.Width - , _headerImg.Width - );

            using (GraphicsPath path1 = CreateRoundedRectanglePath(rect1, ))

            {

                g1.DrawPath(p1, path1);

                TextureBrush brush = new TextureBrush(_headerImg);

                g1.FillPath(brush, path1);

            }

            g1.Dispose();

            PointF center = new PointF((newImgWidth - _headerImg.Width) / , (newImgWidth - _headerImg.Height) / );

            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, , );

            PointF center2 = new PointF((qrImg.Width - headerBgImg.Width) / , (qrImg.Height - headerBgImg.Height) / );

            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 * , cornerRadius * , , );

            roundedRect.AddLine(rect.X + cornerRadius, rect.Y, rect.Right - cornerRadius * , rect.Y);

            roundedRect.AddArc(rect.X + rect.Width - cornerRadius * , rect.Y, cornerRadius * , cornerRadius * , , );

            roundedRect.AddLine(rect.Right, rect.Y + cornerRadius * , rect.Right, rect.Y + rect.Height - cornerRadius * );

            roundedRect.AddArc(rect.X + rect.Width - cornerRadius * , rect.Y + rect.Height - cornerRadius * , cornerRadius * , cornerRadius * , , );

            roundedRect.AddLine(rect.Right - cornerRadius * , rect.Bottom, rect.X + cornerRadius * , rect.Bottom);

            roundedRect.AddArc(rect.X, rect.Bottom - cornerRadius * , cornerRadius * , cornerRadius * , , );

            roundedRect.AddLine(rect.X, rect.Bottom - cornerRadius * , rect.X, rect.Y + cornerRadius * );

            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(, , newImage.Width, newImage.Height), new System.Drawing.Rectangle(, , initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);

            newG.Dispose();

            return newImage;

        }

        #endregion

    }

}

测试代码：

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Test.One.Common;

namespace Test.One.Test

{

    class Program

    {

        static void Main(string[] args)

        {

            #region  测试一、生成中间没有LOGO的二维码

            //需要生成二维码的内容

            //string content = "https://www.baidu.com";

            //Bitmap bitmap = QRCodeHelper.Create(content, 300);

            //string filename = DateTime.Now.ToFileTime().ToString();

            //string saveFileUrl = string.Format(@"E:\RQCode\{0}.png", filename);

            //bitmap.Save(saveFileUrl, System.Drawing.Imaging.ImageFormat.Png);

            //bitmap.Dispose(); //释放资源

            #endregion

            #region 测试二、生成带有LOGO二维码

            //string qrFileUrl = @"E:\RQCode\131272918918217301.png";

            //string headerFileUrl = @"E:\RQCode\111.png";

            //string filename = DateTime.Now.ToFileTime().ToString();

            //string saveFileUrl = string.Format(@"E:\RQCode\{0}.png", filename);

            //Bitmap qrCodeBitmap = new Bitmap(qrFileUrl);

            //Bitmap headerBitmap = new Bitmap(headerFileUrl);

            //Bitmap qrAndHeaderBitmap = QRCodeHelper.MergeQrImg(qrCodeBitmap, headerBitmap);

            //qrAndHeaderBitmap.Save(saveFileUrl, System.Drawing.Imaging.ImageFormat.Png);

            //qrAndHeaderBitmap.Dispose(); //释放资源

            //qrCodeBitmap.Dispose();

            //headerBitmap.Dispose();

            #endregion

            #region 测试三、生成无LOGO和有LOGO的二维码

            string content = "http://www.baidu.com";

            Bitmap bitmap = QRCodeHelper.Create(content, );

            string qrCodefilename = DateTime.Now.ToFileTime().ToString();

            string qrCodeSaveFileUrl = string.Format(@"E:\RQCode\{0}.png", qrCodefilename);

            bitmap.Save(qrCodeSaveFileUrl, System.Drawing.Imaging.ImageFormat.Png);

            string headerFileUrl = @"E:\RQCode\111.png";

            string filename = DateTime.Now.ToFileTime().ToString();

            string saveFileUrl = string.Format(@"E:\RQCode\{0}.png", filename);

            Bitmap headerBitmap = new Bitmap(headerFileUrl);

            Bitmap qrAndHeaderBitmap = QRCodeHelper.MergeQrImg(bitmap, headerBitmap);

            qrAndHeaderBitmap.Save(saveFileUrl, System.Drawing.Imaging.ImageFormat.Png);

            qrAndHeaderBitmap.Dispose(); //释放资源

            bitmap.Dispose();

            headerBitmap.Dispose();

            #endregion

            Console.ReadLine();

        }

    }

}