URLからページを読み込むときのC＃HtmlAgilityPack TypeAccessException
c# exception html-agility-pack request windows-mobile
質問
私は、HTMLページを解析してHTMLDocument変数に変換し、ページを調べたり、値を取得したりするために使用するWindows Phoneアプリを開発しようとしています.BBC Newsのホームページ私はエラーが発生しています。
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()
このページは資格情報を必要としないので、私はこのエラーが発生した理由について非常に混乱しています。ここにコードがあります。
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()
受け入れられた回答
私はおそらく質問に言及する必要があるWindows Phone 8.1を使用しています。以下は働いています。
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 (...) { ... }
}
人気のある回答
私はpasrse Htmlことでhtml-agility-packこのように：
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
//cookie if you need
request.CookieContainer = cookie;
//WebRequestMethods.Http.Get
//or WebRequestMethods.Http.Post
request.Method = method;
request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36";
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
request.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4");
request.ServicePoint.Expect100Continue = false;
request.Timeout = 100000;
request.ContentType = "application/x-www-form-urlencoded";
using (WebResponse myResponse = request.GetResponse())
{
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.OptionFixNestedTags = true;
htmlDoc.Load(myResponse.GetResponseStream(), Encoding.GetEncoding(1251));
}
その後
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
//cookie if you need
request.CookieContainer = cookie;
//WebRequestMethods.Http.Get
//or WebRequestMethods.Http.Post
request.Method = method;
request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36";
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
request.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4");
request.ServicePoint.Expect100Continue = false;
request.Timeout = 100000;
request.ContentType = "application/x-www-form-urlencoded";
using (WebResponse myResponse = request.GetResponse())
{
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.OptionFixNestedTags = true;
htmlDoc.Load(myResponse.GetResponseStream(), Encoding.GetEncoding(1251));
}