How to create an empty XHTML compliant P node using HTML Agility Pack 1.4.0?

However I try to create an HTMLNode for the P tag and inject it into the HTMLDocument DOM, it always appears as an unclosed tag. For example.

// different ways I've tried creating the node:
var p = HtmlNode.CreateNode("<p />");
var p = HtmlNode.CreateNode("<p></p>");
var p = HtmlNode.CreateNode("<p>");
var p = HtmlTextNode.CreateNode("<p></p>");

// some other properties I've played with:
p.Name = "p";
p.InnerHtml = "";

They all end up as just <p> in the output after using the .Save() method.

I want it properly closed for XHTML like <p /> or <p></p>. Either is fine.

My workaround: What I can do is issue CreateNode("<p> </p>") (with a space in between) and it retains the entire source, but I think there has to be a better way.

Other options tried or considered:

• When I turn on the option .OutputAsXml it escapes the existing entities, for example   turns to   which is not ideal, and it doesn't close my injected P tag.

• when I enable the option .OptionWriteEmptyNodes it still doesn't close my injected P tag.

• I see the Agility Pack contains the enum HtmlElementFlag with values Closed, Empty, CData, CanOverlap (Closed might be useful) but cannot see where I would apply i开发者_运维问答t when creating a new element/node.

I found the answer: the P tag has to be created off the HtmlDocument instance using the CreateElement(..) factory method like so:

var hdoc = new HtmlDocument(); // HTML doc instance
// ... stuff
HtmlNode p = hdoc.CreateElement("p");  // << will close itself for XHTML. 

Then P will close itself like <p />.

If you instead create an HtmlNode instance using the HtmlNode.CreateNode(..) factory method like I was trying in the question, it behaves differently in the DOM as far as closure.

HtmlNode.ElementsFlags["p"] = HtmlElementFlag.Closed;

Default value for "p" is "Empty | Closed". You should to set it as "Closed" to return:

<p></p>