c# - AngleSharp 解析

Question

当您没有要使用的类名或 ID 时，找不到许多使用 AngleSharp 进行解析的示例。

HTML

<span><a href="google.com" title="Google"><span class="icon icon_none"></span></a></span>
<span><a href="bing.com" title="Bing"><span class="icon icon_none"></span></a></span>
<span><a href="yahoo.com" title="Yahoo"><span class="icon icon_none"></span></a></span>

我想从任何 <a> 中找到 href标题为 Bing 的标签

在 Python BeautifulSoup 中我会使用

item_needed = a_row.find('a', {'title': 'Bing'})

然后抓取href属性

或jQuery

a[title='Bing']

但是，我无法使用 AngleSharp例如。下面的例子 https://github.com/AngleSharp/AngleSharp/wiki/Examples#getting-certain-elements

C# AngleSharp

var parser = new AngleSharp.Parser.Html.HtmlParser();
var document = parser.Parse(@"<span><a href=""google.com"" title=""Google""><span class=""icon icon_none""></span></a></span>< span >< a href = ""bing.com"" title = ""Bing"" >< span class=""icon icon_none""></span></a></span><span><a href = ""yahoo.com"" title=""Yahoo""><span class=""icon icon_none""></span></a></span>");

//Do something with LINQ
var blueListItemsLinq = document.All.Where(m => m.LocalName == "a" && //stuck);

Answer 1

看起来您的 HTML 标记中存在问题导致 AngleSharp 无法找到目标元素，即尖括号周围的空格:

< span >< a href = ""bing.com"" title = ""Bing"" >< span class=""icon icon_none"">

修复 HTML 后，LINQ 和 CSS 选择器都成功选择了目标链接:

var parser = new AngleSharp.Parser.Html.HtmlParser();
var document = parser.ParseDocument(@"<span><a href=""google.com"" title=""Google""><span class=""icon icon_none""></span></a></span><span><a href = ""bing.com"" title = ""Bing""><span class=""icon icon_none""></span></a></span><span><a href = ""yahoo.com"" title=""Yahoo""><span class=""icon icon_none""></span></a></span>");

//LINQ example
var blueListItemsLinq = document.All
                                .Where(m => m.LocalName == "a" && 
                                            m.GetAttribute("title") == "Bing"
                                       );

//LINQ equivalent CSS selector example
var blueListItemsCSS = document.QuerySelectorAll("a[title='Bing']");

//print href attributes value to console
foreach (var item in blueListItemsCSS)
{
    Console.WriteLine(item.GetAttribute("href"));
}