C#运用QRCode生成二维码

  在现在的项目中，较多的使用到二维码，现在介绍一个第三方组件，用于生成二维码。

1. 生成二维码：

        /// <summary>         /// 生成二维码         /// </summary>         /// <param name="content">带生成二维码的字符串</param>         /// <param name="path">路径</param>         /// <returns></returns>         public static string CreatehoughtWorksQrCode(string content, string path)         {             if (string.IsNullOrEmpty(content))             {                 throw new ArgumentNullException(content);             }             if (string.IsNullOrEmpty(path))             {                 throw new ArgumentNullException(path);             }             var qrCodeEncoder = new QRCodeEncoder             {                 QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE,                 QRCodeScale = 4,                 QRCodeVersion = 8,                 QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M             };             Image p_w_picpath = qrCodeEncoder.Encode(content);             var filename = DateTime.Now.ToString("yyyymmddhhmmssfff") + ".jpg";             var filepath = string.Format("{0}{1}", path, filename);             FileStream fs = null;             try             {                 fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write);                 p_w_picpath.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);             }             catch (IOException ex)             {                 throw new IOException(ex.Message);             }             finally             {                 if (fs != null) fs.Close();                 p_w_picpath.Dispose();             }             return CodeDecoder(filepath);         }

2.解析二维码：

        /// <summary>         /// 二维码解码         /// </summary>         /// <param name="filePath">图片路径</param>         /// <returns></returns>         public static string CodeDecoder(string filePath)         {             if (string.IsNullOrEmpty(filePath))             {                 throw new ArgumentNullException(filePath);             }             try             {                 if (!System.IO.File.Exists(filePath))                     return null;                 var myBitmap = new Bitmap(Image.FromFile(filePath));                 var decoder = new QRCodeDecoder();                 var decodedString = decoder.decode(new QRCodeBitmapImage(myBitmap));                 return decodedString;             }             catch (Exception ex)             {                 throw new Exception(ex.Message);             }         }

3.选择生成的二维码参数：

        /// <summary>         /// 选择生成二维码的相关类型         /// <param name="strData">要生成的文字或者数字，支持中文。如： "4408810820 深圳－广州" 或者：4444444444</param>         /// <param name="qrEncoding">三种尺寸：BYTE ，ALPHA_NUMERIC，NUMERIC</param>         /// <param name="level">大小：L M Q H</param>         /// <param name="version">版本：如 8</param>         /// <param name="scale">比例：如 4</param>         /// <returns></returns>         /// </summary>         public void CreateCode_Choose(string strData, string qrEncoding, string level, int version, int scale)         {             var qrCodeEncoder = new QRCodeEncoder();             var encoding = qrEncoding;             switch (encoding)             {                 case "Byte":                     qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                     break;                 case "AlphaNumeric":                     qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;                     break;                 case "Numeric":                     qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;                     break;                 default:                     qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                     break;             }             qrCodeEncoder.QRCodeScale = scale;             qrCodeEncoder.QRCodeVersion = version;             switch (level)             {                 case "L":                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;                     break;                 case "M":                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;                     break;                 case "Q":                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;                     break;                 default:                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;                     break;             }             Image p_w_picpath = null;             FileStream fs = null;             try             {                 //文字生成图片                 p_w_picpath = qrCodeEncoder.Encode(strData);                 var filename = DateTime.Now.ToString("yyyymmddhhmmssfff") + ".jpg";                 var filepath = HttpContext.Current.Server.MapPath(@"~\Upload") + "\\" + filename;                 fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write);                 p_w_picpath.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);             }             catch (IOException ex)             {                 throw new IOException(ex.Message);             }             finally             {                 if (fs != null) fs.Close();                 if (p_w_picpath != null) p_w_picpath.Dispose();             }         }