C# 生成以及读取条形码、二维码

先引用 using ZXing;

   /// 

        /// 生成二维码,保存成图片
        /// 
        /// 保存的路径
        /// 内容
        static void Generate1(string path,string text)
        {
            BarcodeWriter writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.QR_CODE;
            QrCodeEncodingOptions options = new QrCodeEncodingOptions();
            options.DisableECI = true;
            //设置内容编码
            options.CharacterSet = "UTF-8";
            //设置二维码的宽度和高度
            options.Width = 500;
            options.Height = 500;
            //设置二维码的边距,单位不是固定像素
            options.Margin = 1;
            writer.Options = options;
            Bitmap map = writer.Write(text);
            string filename = Path.Combine(path, "Generate1.png");
            map.Save(filename, ImageFormat.Png);
            map.Dispose();
        }

        /// 

        /// 生成条形码
        /// 
        /// 保存路径
        /// 内容
        static void Generate2(string path,string text)
        {
            BarcodeWriter writer = new BarcodeWriter();
            //使用ITF 格式，不能被现在常用的支付宝、微信扫出来
            //如果想生成可识别的可以使用 CODE_128 格式
            //writer.Format = BarcodeFormat.ITF;
            writer.Format = BarcodeFormat.CODE_128;
            EncodingOptions options = new EncodingOptions()
            {
                Width = 150,
                Height = 50,
                Margin = 2
            };
            writer.Options = options;
            Bitmap map = writer.Write(text);
            string filename = Path.Combine(path, "generate2.png");

            map.Save(filename, ImageFormat.Png);
        }

        /// 

        /// 读取二维码/条形码
        /// 读取失败，返回空字符串
        /// 
        /// 指定二维码图片位置
        static string Read1(string filename)
        {
            BarcodeReader reader = new BarcodeReader();
            reader.Options.CharacterSet = "UTF-8";
            Bitmap map = new Bitmap(filename);
            Result result = reader.Decode(map);
            return result == null ? "" : result.Text;
        }

        /// 

        /// 生成带Logo的二维码
        /// 
        /// 保存路径
        /// logo文件
        /// 内容
        static void Generate3(string path,string logofile,string text)
        {
            //Logo 图片
            Bitmap logo = new Bitmap(logofile);
            //构造二维码写码器
            MultiFormatWriter writer = new MultiFormatWriter();
            Dictionary hint = new Dictionary();
            hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
            hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

            //生成二维码 
            BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, 300, 300, hint);
            BarcodeWriter barcodeWriter = new BarcodeWriter();
            Bitmap map = barcodeWriter.Write(bm);


            //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
            int[] rectangle = bm.getEnclosingRectangle();

            //计算插入图片的大小和位置
            int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width);
            int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height);
            int middleL = (map.Width - middleW) / 2;
            int middleT = (map.Height - middleH) / 2;

            //将img转换成bmp格式，否则后面无法创建Graphics对象
            Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
            using (Graphics g = Graphics.FromImage(bmpimg))
            {
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                g.DrawImage(map, 0, 0);
            }
            //将二维码插入图片
            Graphics myGraphic = Graphics.FromImage(bmpimg);
            //白底
            myGraphic.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
            myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH);

            //保存成图片
            string filename = Path.Combine(path, "Generate3.png");
            bmpimg.Save(filename, ImageFormat.Png);
            bmpimg.Dispose();        
        }