Extract texts from a html tag with C#

Question

I have the below tag in a variable. I need to the extract the values of type and id to different variables using C#. What would be the best approach?

<a href="gana:$type=FlexiPage;id=c828c4ea-075d-4dde-84f0-1876f8b71fa8;title=Workflow%20flexi$">workflow link</a>

Something presumably builds up that html tag - can't you get these values from the source. This looks awfully like an XY Problem to me. — Jamiec
– Jamiec, Commented Sep 8, 2017 at 11:13
@Jamiec No, I cannot actually. Somehow I need to extract from the above. — samithagun
– samithagun, Commented Sep 8, 2017 at 11:14

Tim Schmelter · Accepted Answer · 2017-09-08 11:40:55Z

3

I would also use HtmlAgilityPack if i had to parse HTML. You can use SelectSingleNode, GetAttributeValue and string methods to create a dictionary of key- and value pairs:

var doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html));
var anchor = doc.DocumentNode.SelectSingleNode("a");
string href = anchor.GetAttributeValue("href", "");

// take the text between both $
int startIndex = href.IndexOf('$') + 1;
href = href.Substring(startIndex, href.Length - startIndex); 

Dictionary<string, string> pageInfos = href.Split(';')
    .Select(token => token.Split('='))
    .ToDictionary(kv => kv[0].Trim(), kv => kv[1].Trim(), StringComparer.InvariantCultureIgnoreCase);
string id = pageInfos["id"];     // c828c4ea-075d-4dde-84f0-1876f8b71fa8
string type = pageInfos["type"]; // FlexiPage

edited Sep 8, 2017 at 11:40

answered Sep 8, 2017 at 11:34

Tim Schmelter

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1 Comment

samithagun Over a year ago

This is working like a charm with the HtmlAgilityPack. Thank you very much for the fast response.

Boris Modylevsky · Accepted Answer · 2017-09-08 11:14:03Z

2

You may use HTML Agility Pack and RegEx on the attribute value:

// With XPath   
var hrefValue = doc.DocumentNode
    .SelectNodes("//a")
    .First()
    .Attributes.First(a => a.Name =="href");

// With LINQ    
var hrefAttributeValue = doc.DocumentNode.Descendants("a")
    .Select(y => y.Descendants()
    .First().Attributes.First(a => a.Name =="href");

answered Sep 8, 2017 at 11:14

Boris Modylevsky

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2 Comments

Tim Schmelter Over a year ago

Doesn't show how to extract the id and type which is what OP wanted originally ;-)

Boris Modylevsky Over a year ago

You are right :-) Just thought that it would be too trivial. Your answer is better

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