/// <summary> /// http://stackoverflow.com/questions/3793799/qr-code-generation-in-asp-net-mvc /// Produces the markup for an image element that displays a QR Code image, as provided by Google's chart API. /// </summary> /// <param name = "htmlHelper"></param> /// <param name = "data">The data to be encoded, as a string.</param> /// <param name = "size">The square length of the resulting image, in pixels.</param> /// <param name = "margin">The width of the border that surrounds the image, measured in rows (not pixels).</param> /// <param name = "errorCorrectionLevel">The amount of error correction to build into the image. Higher error correction comes at the expense of reduced space for data.</param> /// <param name = "htmlAttributes">Optional HTML attributes to include on the image element.</param> /// <returns></returns> public static MvcHtmlString QrCode(this HtmlHelper htmlHelper, string data, int size = 80, int margin = 4, QrCodeErrorCorrectionLevel errorCorrectionLevel = QrCodeErrorCorrectionLevel.Low, object htmlAttributes = null) { if (data == null) throw new ArgumentNullException("data"); if (size < 1) throw new ArgumentOutOfRangeException("size", size, "Must be greater than zero."); if (margin < 0) throw new ArgumentOutOfRangeException("margin", margin, "Must be greater than or equal to zero."); if (!Enum.IsDefined(typeof (QrCodeErrorCorrectionLevel), errorCorrectionLevel)) throw new InvalidEnumArgumentException("errorCorrectionLevel", (int) errorCorrectionLevel, typeof (QrCodeErrorCorrectionLevel)); var url = string.Format("http://chart.apis.google.com/chart?cht=qr&chld={2}|{3}&chs={0}x{0}&chl={1}", size, HttpUtility.UrlEncode(data), errorCorrectionLevel.ToString()[0], margin); var tag = new TagBuilder("img"); if (htmlAttributes != null) tag.MergeAttributes(new RouteValueDictionary(htmlAttributes)); tag.Attributes.Add("src", url); tag.Attributes.Add("width", size.ToString()); tag.Attributes.Add("height", size.ToString()); return new MvcHtmlString(tag.ToString(TagRenderMode.SelfClosing)); }
/// <summary> /// http://stackoverflow.com/questions/3793799/qr-code-generation-in-asp-net-mvc /// Produces the markup for an image element that displays a QR Code image, as provided by Google's chart API. /// </summary> /// <param name = "htmlHelper"></param> /// <param name = "data">The data to be encoded, as a string.</param> /// <param name = "size">The square length of the resulting image, in pixels.</param> /// <param name = "margin">The width of the border that surrounds the image, measured in rows (not pixels).</param> /// <param name = "errorCorrectionLevel">The amount of error correction to build into the image. Higher error correction comes at the expense of reduced space for data.</param> /// <param name = "htmlAttributes">Optional HTML attributes to include on the image element.</param> /// <returns></returns> public static MvcHtmlString QrCode(this HtmlHelper htmlHelper, string data, int size = 80, int margin = 4, QrCodeErrorCorrectionLevel errorCorrectionLevel = QrCodeErrorCorrectionLevel.Low, object htmlAttributes = null) { if (data == null) { throw new ArgumentNullException("data"); } if (size < 1) { throw new ArgumentOutOfRangeException("size", size, "Must be greater than zero."); } if (margin < 0) { throw new ArgumentOutOfRangeException("margin", margin, "Must be greater than or equal to zero."); } if (!Enum.IsDefined(typeof(QrCodeErrorCorrectionLevel), errorCorrectionLevel)) { throw new InvalidEnumArgumentException("errorCorrectionLevel", (int)errorCorrectionLevel, typeof(QrCodeErrorCorrectionLevel)); } var url = string.Format("http://chart.apis.google.com/chart?cht=qr&chld={2}|{3}&chs={0}x{0}&chl={1}", size, HttpUtility.UrlEncode(data), errorCorrectionLevel.ToString()[0], margin); var tag = new TagBuilder("img"); if (htmlAttributes != null) { tag.MergeAttributes(new RouteValueDictionary(htmlAttributes)); } tag.Attributes.Add("src", url); tag.Attributes.Add("width", size.ToString()); tag.Attributes.Add("height", size.ToString()); return(new MvcHtmlString(tag.ToString(TagRenderMode.SelfClosing))); }