در این سایت می توانید با نحوه پیاده سازی Amp در MVC آشنا شوید.
public class UseAmpImageAttribute : ActionFilterAttribute
{
private HtmlTextWriter _htmlTextWriter;
private StringWriter _stringWriter;
private StringBuilder _stringBuilder;
private HttpWriter _output;
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
_stringBuilder = new StringBuilder();
_stringWriter = new StringWriter(_stringBuilder);
_htmlTextWriter = new HtmlTextWriter(_stringWriter);
_output = (HttpWriter)filterContext.RequestContext.HttpContext.Response.Output;
filterContext.RequestContext.HttpContext.Response.Output = _htmlTextWriter;
}
public override void OnResultExecuted(ResultExecutedContext filterContext)
{
var response = _stringBuilder.ToString();
// Change images to Amp-specific images
response = UpdateAmpImages(response);
// For AMP pages, change Script content to a link.
response = ReplaceWithLink("script", response);
// For AMP pages, change iFrame content to a link.
response = ReplaceWithLink("iframe", response);
_output.Write(response);
}
private string ReplaceWithLink(string tag, string response)
{
var doc = GetHtmlDocument(response);
var elements = doc.DocumentNode.Descendants(tag);
foreach (var htmlNode in elements)
{
if (htmlNode.Attributes["data-link"] == null) continue;
var dataLink = htmlNode.Attributes["data-link"].Value;
var paragraph = doc.CreateElement("p");
var text = String.Format("[Embedded Link] {0}", dataLink);
var anchor = doc.CreateElement("a");
anchor.InnerHtml = text;
anchor.Attributes.Add("href", dataLink);
anchor.Attributes.Add("title", text);
paragraph.InnerHtml = anchor.OuterHtml;
var original = htmlNode.OuterHtml;
var replacement = paragraph.OuterHtml;
response = response.Replace(original, replacement);
}
return response;
}
private string UpdateAmpImages(string response)
{
// Use HtmlAgilityPack (install-package HtmlAgilityPack)
var doc = GetHtmlDocument(response);
var imageList = doc.DocumentNode.Descendants("img");
const string ampImage = "amp-img";
if (!imageList.Any()) return response;
if (!HtmlNode.ElementsFlags.ContainsKey("amp-img"))
{
HtmlNode.ElementsFlags.Add("amp-img", HtmlElementFlag.Closed);
}
foreach (var imgTag in imageList)
{
var original = imgTag.OuterHtml;
var replacement = imgTag.Clone();
replacement.Name = ampImage;
replacement.Attributes.Remove("caption");
response = response.Replace(original, replacement.OuterHtml);
}
return response;
}
private HtmlDocument GetHtmlDocument(string htmlContent)
{
var doc = new HtmlDocument
{
OptionOutputAsXml = true,
OptionDefaultStreamEncoding = Encoding.UTF8
};
doc.LoadHtml(htmlContent);
return doc;
}
} 
