HtmlAgilityPack in windows store app

Question

So I had some working test code in a console app, that I am moving over to a windows store app. NoW the problem is, ive just copied over the HtmlAgilityPack code that I had in my console app and now it doesnt work. I do have HtmlAgilityPack as a reference...

Now some of the HtmlAgilityPack does work. what is not working is
"using (var client = new WebClient())" just through the error "The type or namespace name 'WebClient' could not be found (are you missing a using directive or an assembly reference?)"

and the next part that does not work is " foreach (HtmlNode link in doc.DocumentNode.SelectNodes("//a[@href]"))" at the selectnodes part, with the error "'HtmlAgilityPack.HtmlNode' does not contain a definition for 'SelectNodes' and no extension method 'SelectNodes' accepting a first argument of type 'HtmlAgilityPack.HtmlNode' could be found (are you missing a using directive or an assembly reference)"

Now N know that Html Agility Pack relies on .NET for the XPATH implementation. And that WinRT doesn't support XPATH. Now my question is, how would I accomplish the same below with something that will run in a windows store app?

The code below does the the following. Downloads the html page from http://www.dubstep.net/track/5436, loops through it looking for href, once it finds a #. It takes the href above it and and sends it as a uri to start.

i have verified that the code below does work in a console application.

 using (var client = new WebClient())
        {
            // Download the HTML
            string html = client.DownloadString("http://www.dubstep.net/track/5436");

            // Now feed it to HTML Agility Pack:
            HtmlDocument doc = new HtmlDocument();
            doc.LoadHtml(html);
            int i = 0;
            // Now you could query the DOM. For example you could extract
            // all href attributes from all anchors:
            List<string> list = new List<string>();
            foreach (HtmlNode link in doc.DocumentNode.SelectNodes("//a[@href]"))
            {
                HtmlAttribute href = link.Attributes["href"];
                if (href != null)
                {
                    list.Add(href.Value);
                    i++;
                    if (href.Value == "#")
                    {
                        int t = i - 2;
                        Uri test = new Uri(list[t]);
                        start(test);
                    }
                }
            }
        }

 public static void start(Uri t)
    {
        Uri remoteUri = new Uri("http://soundcloud.com/dubstep/spag-heddy-the-master-vip/download");
        string fileName1 = "t", myStringWebResource = null;

        // Create a new WebClient instance.
        using (WebClient myWebClient = new WebClient())
        {
            myWebClient.DownloadFileCompleted += DownloadCompleted;
            myWebClient.DownloadProgressChanged += myWebClient_DownloadProgressChanged;
            myWebClient.DownloadFileAsync(t, "file.mp3");
        }
    }

Answer 1

For XPath, you can use the following link to find an implementation (+source code) for XPath for Windows Phone. The code is easily transferrable to WinRT.

Note: Using LINQ is generally far superior to using XPath. There's one case where that's not true - if your XPaths are coming from a server. In this cases, you can use a solution such as this.

http://socialebola.wordpress.com/2011/07/06/xpath-support-for-the-html-agility-pack-on-windows-phone/

Answer 2

You can try to replace WebClient with HtmlWeb and use HtmlAgilityPack's LINQ API instead of XPath, to make it works in Windows Store apps :

//use HAP's HtmlWeb instead of WebClient
var htmlweb = new HtmlWeb();
// load HtmlDocument from web URL
HtmlDocument doc = htmlweb.Load("http://www.dubstep.net/track/5436");


int i = 0;
List<string> list = new List<string>();

//use LINQ API to select all `<a>` having `href` attribute
var links = doc.DocumentNode
               .DescendantsAndSelf("a")
               .Where(o => o.GetAttributeValue("href", null) != null);
foreach (HtmlNode link in links)
{
    HtmlAttribute href = link.Attributes["href"];
    if (href != null)
    {
        list.Add(href.Value);
        i++;
        if (href.Value == "#")
        {
            int t = i - 2;
            Uri test = new Uri(list[t]);
            start(test);
        }
    }
}