项目中需要生成二维码，方法比较多，可以采用JS插件，也可以采用第三方插件后台生成二维码，在后台方法中可以采用QRCode或者GmaQrCode，现在介绍一种C#在后台生成二维码的方法：
/// <summary> /// 获取二维码 /// </summary> /// <param name="codeString">编码字符</param> /// <returns>二维码地址</returns> public static string ReturnGmaQrCode(string codeString) { try { using (var ms = new MemoryStream()) { //const string stringtest = "中国ing?&"; if (string.IsNullOrEmpty(codeString)) { throw new ArgumentNullException(codeString); } var stringtest = codeString; CreateGmaQrCodeHelper(stringtest, ms); var img = Image.FromStream(ms); var filename = DateTime.Now.ToString("yyyymmddhhmmss"); var path = HttpContext.Current.Server.MapPath("~/image/") + filename + ".png"; img.Save(path); return path; } } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// 获取二维码 /// </summary> /// <param name="strContent">待编码的字符</param> /// <param name="ms">输出流</param> ///<returns>True if the encoding succeeded, false if the content is empty or too large to fit in a QR code</returns> public static bool CreateGmaQrCodeHelper(string strContent, MemoryStream ms) { try { //误差校正水平 const ErrorCorrectionLevel ecl = ErrorCorrectionLevel.M; //待编码内容 var content = strContent; //空白区域 const QuietZoneModules quietZones = QuietZoneModules.Two; //大小 const int moduleSize = 12; var encoder = new QrEncoder(ecl); QrCode qr; //对内容进行编码，并保存生成的矩阵 if (encoder.TryEncode(content, out qr)) { var render = new GraphicsRenderer(new FixedModuleSize(moduleSize, quietZones)); render.WriteToStream(qr.Matrix, ImageFormat.Png, ms); } else { return false; } } catch (Exception ex) { throw new Exception(ex.Message); } return true; }