Where is the error in my C# html parser?

Question

C++ / C#

There is a project. Parser made according to the lesson, I am attaching a link to this project so that you can see the code for yourself. When you run the source code, the habra headers are parsed, I changed the settings for my request, but the headers are not parsed, although I definitely did everything right.
I really ask for help.
GitHub Sorce
What I did, I replaced the link class in the file in the Core/Habra/HabraParser.cs folder
from post__title_link to PreviewTooltip (the only sin is that the title class is there)
I also changed the file in the Core/habra/HabraSettings folder .cs a link to the forum itself
from https://habrahabr.ru to https://mysite/forums/252
and changed the prefix from page{CurrentId} to page-{CurrentId}
because the link comes out when you clickhttps://mysite/forums/252/page-2
I also give the full html of this block, where the link is located:

<div class="listBlock main">
  <div class="titleText">
 <h3 class="title"><a href="threads/61443/" title="" class="PreviewTooltip" data-previewurl="threads/61443/preview">Название темы</a></h3>
</div>
</div>

What I need? But I need to somehow parse the data-previewurl value so that the parser gives me such a result in the mysite.ru/threads/61443/ sheet. and all the pages that are in the category of this forum

Answer 1

It seems that you did not understand the parser and did not read the AngleSharp documentation.
First, how to debug the parser on https://mysite/forums? Imagine mentally, guessing intuitively?
Secondly, you want to get the value of the data-previewurl attribute, but the result is mysite.ru/threads/61443, and this is the value of another attribute - href, and in the question you say "but the headers are not parsed." You decide: Do you need a title or an attribute value, and which one?
Thirdly, if you read the documentation, you would know how to get the value of an attribute, I added it to the Parse method in your project

if (item.HasAttribute("data-previewurl"))
{
  list.Add(item.GetAttribute("data-previewurl"));
}

To do this, you had to hardcode your html block.
Well, actually your need will look like
Everything works great.