二维码生成

下载QrCodeNet

/// <summary>
        /// 生成QR码
        /// </summary>
        /// <param name="output_path">输出路径</param>
        /// <param name="text">写入文本</param>
        /// <param name="scale">缩放比例</param>
        public static void GetQRCode(String output_path, String text, Int32 scale)
        {
            QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.L);
            QrCode qrCode = new QrCode();
            qrEncoder.TryEncode(text, out qrCode);

            Bitmap img = new Bitmap(qrCode.Matrix.Width * scale, qrCode.Matrix.Height * scale);
            img.SetResolution(180f, 180f);
            Graphics gdiobj = Graphics.FromImage(img);
            gdiobj.CompositingQuality = CompositingQuality.HighQuality;
            gdiobj.SmoothingMode = SmoothingMode.HighQuality;
            gdiobj.InterpolationMode = InterpolationMode.HighQualityBicubic;
            gdiobj.PixelOffsetMode = PixelOffsetMode.HighQuality;

            for (Int32 i = 0; i < qrCode.Matrix.Height; i++)
            {
                for (Int32 j = 0; j < qrCode.Matrix.Width; j++)
                {
                    if (qrCode.Matrix.InternalArray[i, j])
                    {
                        gdiobj.FillRectangle(new SolidBrush(Color.Black), i * scale, j * scale, scale, scale);
                    }
                }
            }

            System.Drawing.Imaging.EncoderParameters ep = new System.Drawing.Imaging.EncoderParameters(1);
            ep.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 800L);

            System.Drawing.Imaging.ImageCodecInfo ici = GetEncoder(ImageFormat.Png);

            if (ici != null)
            {
                img.Save(output_path, ici, ep);
            }
            else
            {
                img.Save(output_path, ImageFormat.Png);
            }
            img.Dispose();
            gdiobj.Dispose();
        }

 比例的缩放没写好