在简单的WP8应用程序中出现XML错误

Question

My code is this:

namespace MyNSpace
{
    public partial class MainPage : PhoneApplicationPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        async private void ButtonParse_Click(object sender, RoutedEventArgs e)
        {
            HttpClient client = new HttpClient();
            var doc = new HtmlAgilityPack.HtmlDocument();
            string url = "www.mysite.com";
            string html = await client.GetStringAsync(url);
            doc.LoadHtml(html);
            HtmlNodeCollection tl = doc.DocumentNode.SelectNodes("//div[@class=\"photo\"]/a/img");
            //I must still write this part
        }
    }
}

I get this error on the var doc = new HtmlAgilityPack.HtmlDocument(); line:

The type 'System.Xml.XPath.IXPathNavigable' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Xml.XPath, Version=2.0.5.0, Culture=neutral,

Why? I read that people got this problem if they didn't load a certain System.Xml.XPath.dll both manually and writing the Using line. If I try to import the DLL manually, I get an error that I'm trying to add a reference to an assembly that is not compatible. It's the first time I'm programming for Windows Phone, so I won't be surprised if it's a little problem.

Answer 1

Make sure you added reference to Silverlight version of System.Xml.XPath.dll . That's required to use HtmlAgilityPack in Windows Phone Project.

I've tested with Windows Phone 7.5 only, but based on this article it seems to be working for Windows Phone 8 project too (see Article Metadata > Compatibility Platform(s) section in that link). In my case the .dll resides in this path :

C:\Program Files (x86)\Microsoft SDKs\Silverlight\v4.0\Libraries\Client