从网址加载页面时，C＃HtmlAgilityPack TypeAccessException

debugcn 发表于 Dev

乔什·黄铜

我正在尝试开发Windows Phone应用程序，该应用程序将HTML页面（通过Web检索）解析为HTMLDocument变量，并使用它来检查页面，检索值等。即使尝试连接到BBC News Home page之类的页面我收到一个错误。

System.TypeAccessException: Attempt by security transparent method 'HtmlAgilityPack.HtmlWeb.LoadFromWebAsync(System.Uri, System.Text.Encoding, System.Net.NetworkCredential)' to access security critical type 'System.Net.NetworkCredential' failed.
   at HtmlAgilityPack.HtmlWeb.LoadFromWebAsync(Uri uri, Encoding encoding, NetworkCredential credentials)
   at HtmlAgilityPack.HtmlWeb.<LoadFromWebAsync>d__0.MoveNext()

该页面不需要凭据，因此我很困惑为什么遇到此错误。这是代码。

private async Task GetHtmlDocument(string url)
{
    Debug.WriteLine("This is a line");
    try
    {
        HtmlWeb web = new HtmlWeb();
        HtmlDocument rootDocument = await web.LoadFromWebAsync(url);
    }
    catch (Exception e)
    {
        Debug.WriteLine("Exception: " + e);
    }
}

乔什·黄铜

我正在使用Windows Phone 8.1，我可能需要在问题中提及它。以下工作。

private async Task GetHtmlDocument(string url)
{
    HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
    request.Credentials = new LoginCredentials().Credentials;

    try
    {
        WebResponse myResponse = await request.GetResponseAsync();
        HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
        htmlDoc.OptionFixNestedTags = true;
        htmlDoc.Load(myResponse.GetResponseStream());
    } catch (...) { ... }
}

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