C# 生成二维码(【ThoughtWorks.QRCode】【QRCoder】【ZXing.Net】)

1、通过ThoughtWorks.QRCode实现生成二维码，可直接通过添加Nuget包引用

        /// <summary>
        /// ThoughtWorks.QRCode生成二维码
        /// </summary>
        /// <param name="filePath">二维码生成后保存地址</param>
        /// <param name="qrCodeContent">二维码内容</param>
        public static void CreateQRCode(string filePath, string qrCodeContent)
        {
            ThoughtWorks.QRCode.Codec.QRCodeEncoder qrCodeEncoder = new ThoughtWorks.QRCode.Codec.QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeScale = 4;//二维码大小比例
            qrCodeEncoder.QRCodeVersion = 8;
            qrCodeEncoder.QRCodeErrorCorrect = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ERROR_CORRECTION.M;
            System.Drawing.Image image = qrCodeEncoder.Encode(qrCodeContent, Encoding.UTF8);//生成二维码图片
            System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None);
            image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
            fs.Close();
            image.Dispose();
        }
        /// <summary>
        /// 二维码解码
        /// </summary>
        /// <param name="filePath">二维码图片路径</param>
        /// <returns></returns>
        public static string QRCodeDecoder(string filePath)
        {
            if (!System.IO.File.Exists(filePath))
            { return null; }
            System.Drawing.Bitmap myBitmap = new System.Drawing.Bitmap(System.Drawing.Image.FromFile(filePath));
            ThoughtWorks.QRCode.Codec.QRCodeDecoder decoder = new ThoughtWorks.QRCode.Codec.QRCodeDecoder();
            string decodedString = decoder.decode(new ThoughtWorks.QRCode.Codec.Data.QRCodeBitmapImage(myBitmap), Encoding.UTF8);
            return decodedString;
        }

2、通过QRCoder实现生成二维码，可直接通过添加Nuget包引用

        /// <summary>
        /// 生成二维码可附带中央水印
        /// </summary>
        /// <param name="filePath">二维码生成后保存地址</param>
        /// <param name="qrCodeContent">二维码内容</param>
        /// <param name="iconPath">二维码中央水印保存地址</param>
        public static void CreateQRCode(string filePath, string qrCodeContent, string iconPath = "")
        {
            // 生成二维码的内容
            QRCoder.QRCodeGenerator qrGenerator = new QRCoder.QRCodeGenerator();
            QRCoder.QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrCodeContent, QRCoder.QRCodeGenerator.ECCLevel.Q);
            QRCoder.QRCode qrcode = new QRCoder.QRCode(qrCodeData);
            System.Drawing.Bitmap icon = null;//中央水印图标
            int iconSizePercent = 0;//水印图标大小
            int iconBorderWidth = 0;//水印图标边框
            int pixelsPerModule = 55;//像素大小
            bool drawQuietZones = false;//是否需要二维码外围空白区域（白边）
            System.Drawing.Color darkColor = System.Drawing.Color.Black;//二维码暗色部分,Color.颜色
            System.Drawing.Color lightColor = System.Drawing.Color.White;//亮色部分,Color.颜色
            //判断有无中心水印图标
            if (!string.IsNullOrWhiteSpace(iconPath))
            {
                icon = new System.Drawing.Bitmap(iconPath);
                iconSizePercent = 10;
                iconBorderWidth = 10;
            }
            //设置生成二维码
            System.Drawing.Bitmap qrCodeImage = qrcode.GetGraphic(pixelsPerModule, darkColor, lightColor, icon, iconSizePercent, iconBorderWidth, drawQuietZones);
            //保存二维码图片
            System.IO.Stream outputStream = new System.IO.FileStream(filePath, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None);
            qrCodeImage.Save(outputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
            outputStream.Close();
            outputStream.Dispose();
        }

 3、通过ZXing.Net实现生成二维码，可直接通过添加Nuget包引用

    /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="filePath">地址</param>
        /// <param name="qrCodeContent">内容</param>
        public static void CreateZXingQrCode(string filePath, string qrCodeContent)
        {
            //设置规格
            ZXing.QrCode.QrCodeEncodingOptions options = new ZXing.QrCode.QrCodeEncodingOptions()
            {
                Width = 500,//设置二维码的宽度
                Height = 500,//设置二维码的高度
                Margin = 1,//设置二维码的边距
                CharacterSet = "UTF-8",//设置内容编码
                DisableECI = true,
            };
            //生成二维码
            ZXing.BarcodeWriter writer = new ZXing.BarcodeWriter()
            {
                Format = ZXing.BarcodeFormat.QR_CODE,//生成类型
                Options = options,//设置格式
            };
            //
            System.Drawing.Bitmap bitmap = writer.Write(qrCodeContent);//存放二维码;
            //进行保存
            bitmap.Save(filePath, System.Drawing.Imaging.ImageFormat.Jpeg);
            bitmap.Dispose();
        }
        /// <summary>
        /// 生成带logo的二维码
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="qrCodeContent"></param>
        /// <param name="imagePath"></param>
        public static void CreateZXingQrCode(string filePath, string qrCodeContent, string imagePath)
        {
            //设置规格
            ZXing.QrCode.QrCodeEncodingOptions option = new ZXing.QrCode.QrCodeEncodingOptions()
            {
                CharacterSet = "UTF-8",// 设置编码格式，否则读中文会乱码
                Height = 200,
                Width = 200,
                Margin = 1,// 设置二维码周围空白边距(可选)
            };
            //生成图片
            ZXing.BarcodeWriter writer = new ZXing.BarcodeWriter()
            {
                Options = option,
                Format = ZXing.BarcodeFormat.QR_CODE,//生成类型
            };
            System.Drawing.Bitmap img = writer.Write(qrCodeContent);
            // 添加logo图片
            System.Drawing.Bitmap logoImg = System.Drawing.Bitmap.FromFile(imagePath) as System.Drawing.Bitmap;
            System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(img);
            System.Drawing.Rectangle logoRec = new System.Drawing.Rectangle() ;
            //设置logo图片的大小和绘制位置
            logoRec.Width = img.Width / 6;
            logoRec.Height = img.Height / 6;
            logoRec.X = img.Width / 2 - logoRec.Width / 2; // 中心点
            logoRec.Y = img.Height / 2 - logoRec.Height / 2;
            graphics.DrawImage(logoImg, logoRec);
            //保存绘制后的图片
            img.Save(filePath, System.Drawing.Imaging.ImageFormat.Jpeg);
            img.Dispose();
        }

        /// <summary>
        /// 读取二维码
        /// </summary>
        /// <param name="filePath">地址</param>
        /// <returns></returns>
        public static string ReadZXingQrCode(string filePath)
        {
            //读取规格
            ZXing.Common.DecodingOptions options = new ZXing.Common.DecodingOptions();
            options.PossibleFormats = new List<ZXing.BarcodeFormat>()
            {
                ZXing.BarcodeFormat.QR_CODE
            };
            ZXing.BarcodeReader br = new ZXing.BarcodeReader()
            {
                Options = options
            };
            //指定规格
            //读取图片
            System.Drawing.Image image = System.Drawing.Image.FromFile(filePath);
            //读取图片内容
            ZXing.Result rs = br.Decode(image as System.Drawing.Bitmap);
            return rs.Text;
        }