Question
I need to extract every paragraph and every word between such tags from a single HTML file.
When the text that is processed into an HTML document differs from the original, the code does not function. The example
some <br />text
is altered in
some <br>text
es:
string s = "<p>firt paragraph</p>some <br />text<p>another paragraph</p><span>some text between span</span><p>hellow word</p>";
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(s);
var nodes = doc.DocumentNode.SelectNodes("//p");
int lastPos = -1;
foreach (HtmlAgilityPack.HtmlNode n in nodes)
{
if (lastPos > -1)
{
string textNotInP = Doc.DocumentNode.OuterHtml.Substring(lastPos, n.StreamPosition - lastPos);
System.Diagnostics.Debug.WriteLine(textNotInP);
}
System.Diagnostics.Debug.WriteLine(n.OuterHtml);
lastPos = n.StreamPosition + n.OuterHtml.Length;
}
the appropriate outcome would be:
<p>firt paragraph</p>
some <br>text
<p>second paragraph</p>
<span>some text between span</span>
<p>third paragraph</p>
nonetheless, the aforementioned code produces the following result:
<p>firt paragraph</p>
some <br>text<p
<p>second paragraph</p>
pan>some text between span</span><p
<p>third paragraph</p>
The reason is because, unlike htmlDocument, steamPosition returns the node position associated with the original text.
Is it possible to get the location of a certain node in the processed HTML?
Accepted Answer
You may utilizeOuterHtml
attribute of each<p>
to get the required HTML:
string s = "<p>firt paragraph</p>some <br />text<p>another paragraph</p><span>some text between span</span><p>hellow word</p>";
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(s);
var nodes = doc.DocumentNode.SelectNodes("//p");
foreach (var item in nodes)
{
Console.WriteLine(item.OuterHtml);
}
output:
<p>firt paragraph</p>
<p>another paragraph</p>
<p>hellow word</p>
Alternatively, if you want to get everything between the first<p>
and lastly<p>
the following XPath to include all elements:
var query = "//node()[preceding-sibling::p or self::p][following-sibling::p or self::p]";
The XPath grabs all nodes that: have a preceding sibling, whether they are elements or text nodes.p
and the succeeding siblingp
, or if the node is ap
element.
var nodes = doc.DocumentNode.SelectNodes(query);
foreach (var item in nodes)
{
Console.WriteLine(item.OuterHtml);
}
output:
<p>firt paragraph</p>
some
<br />
text
<p>another paragraph</p>
<span>some text between span</span>
<p>hellow word</p>
Related Questions
Licensed under: CC-BY-SA with attribution
Not affiliated with Stack Overflow