/// <summary>
/// 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 string QRCode(string data, int size = 100, 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 webClient = new WebClient();
byte[] imageBytes = webClient.DownloadData(url);
string base64String = Convert.ToBase64String(imageBytes);
//string base64String = "image/jpeg;base64," + Convert.ToBase64String(imageBytes);
//webClient.DownloadFile(url, @"C:\someImage.jpg");
return(base64String);
}
/// <summary>
/// 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 = 130,
int margin = 4, QRCodeErrorCorrectionLevel errorCorrectionLevel = QRCodeErrorCorrectionLevel.High, object htmlAttributes = null)
{
if (data == null)
return null;
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>
/// 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(CultureInfo.InvariantCulture));
tag.Attributes.Add("height", size.ToString(CultureInfo.InvariantCulture));
return new MvcHtmlString(tag.ToString(TagRenderMode.SelfClosing));
}
/// <summary>
/// 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)));
}
