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();
        }
    }
}