C#生成带logo的二维码

带logo的二维码生成分为两步骤：首先根据输入的内容生成二维码图片，然后读取本地的logo图片，通过图片处理生成带logo的二维码。

生成的二维码效果如下：

下面直接贴出二维码生成类   QRCodeHelper.cs  ,直接调用  CreateQRCodeWithLogo 方法，传入相应参数返回bitmap类型的数据，直接将返回的数据绑定到图片控件，如果是web可以先将图片保存到服务器指定地址在获取显示

/// <summary>
 /// 生成带logo二维码
 /// </summary>
 public class QRCodeHelper
 {/// <summary>
  /// 创建二维码
  /// </summary>
  /// <param name="content"></param>
  /// <param name="size"></param>
  /// <returns></returns>
  public static Bitmap Create(string content)
  {
   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;
    QRCodeEncoder qRCodeEncoder = new QRCodeEncoder();
    qRCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//设置二维码编码格式
    qRCodeEncoder.QRCodeScale = 4;//设置编码测量度
    qRCodeEncoder.QRCodeVersion = 7;//设置编码版本
    qRCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//设置错误校验
    Bitmap image = qRCodeEncoder.Encode(content);
    return image;
   }
   catch (Exception ex)
   {
    return null;
   }
  }
  /// <summary>
  /// 获取本地图片
  /// </summary>
  /// <param name="fileName"></param>
  /// <returns></returns>
  private static Bitmap GetLocalLog(string fileName)
  {
   Bitmap newBmp = new Bitmap(fileName);
   //Bitmap bmp = new Bitmap(newBmp);
   return newBmp;
  }
  /// <summary>
  /// 生成带logo二维码
  /// </summary>
  /// <returns></returns>
  public static Bitmap CreateQRCodeWithLogo(string content, string logopath)
  {
   //生成二维码
   Bitmap qrcode = Create(content);
   //生成logo
   Bitmap logo = GetLocalLog(logopath);
   ImageUtility util = new ImageUtility();
   Bitmap finalImage = util.MergeQrImg(qrcode, logo);
   return finalImage;
  }
 }

下面是从网上找的图片处理类   ImageUtility.cs

public class ImageUtility
 {
  #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</param>
  /// <param name="headerImg">用户头像</param>
  /// <param name="n"></param>
  /// <returns></returns>
  public 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 - 36 * margin) * 1.0f / 36;
   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, 1))
   {
    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, 1))
   {
    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 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 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;
  }
  /// <summary>
  /// 创建缩略图
  /// </summary>
  /// <param name="b"></param>
  /// <param name="destHeight"></param>
  /// <param name="destWidth"></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;
  }
  #endregion
 }

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