在Windows Store应用中使用HtmlAgility包

Question

In my Windows Store app, I've got the following piece of code to extract a div with the id=pos_0

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(my_html_string);

var div_i_need = doc.DocumentNode.Descendants("div").Where(x => x.Attributes.Contains("id") && x.Attributes["id"].Value == "pos_0").FirstOrDefault();

Is there an easier way to do this? SelectSingleNode doesn't exist in this version of the library, and Descendants doesn't seem to accept XPath

Answer 1

HtmlAgilityPack can't perform XPath query since .NET doesn't have XPath implementation for Windows Store. Your code can be simplified a bit by using GetAttributeValue() method and strip out Where() :

var div_i_need = doc.DocumentNode
                    .Descendants("div")
                    .FirstOrDefault(x => x.GetAttributeValue("id", "") == "pos_0");

GetAttributeValue() returns the second parameter if the attribute is not found