The actual problem is in HtmlAgilityPack internals. The page not working has this meta content type: <META http-equiv="Content-Type" content="text/html; charset=8859-9">
where charset=8859-9
seems to be incorrent. The HAL internals tries to get an appropriate encoding for this string by using something like Encoding.GetEncoding("8859-9")
and this throws an error (I think the actual encoding should be iso-8859-9
).
Actually all you need is to tell the HAL not to read encoding for the HtmlDocument
(just HtmlDocument.OptionReadEncoding = true
), but this seems to be impossible with HtmlWeb.Load
(setting HtmlWeb.AutoDetectEncoding
isn't work here). So, the workaround could be in a manual reading of the url (the simplest way):
var document = new HtmlDocument();
document.OptionReadEncoding = false;
var url =
new Uri("http://www.fiat.com.tr/Pages/tr/otomobiller/grandepunto_fiyat.aspx");
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
using (var response = (HttpWebResponse)request.GetResponse())
{
using (var stream = response.GetResponseStream())
{
document.Load(stream, Encoding.GetEncoding("iso-8859-9"));
}
}
This works, and successfully parses the page.
EDIT: @:Simon Mourier: yes, it raises NullReferenceException
because it catches ArgumentException
and sets _declaredencoding = null
there. And then _declaredencoding.WindowsCodePage
line throws the null reference.
here is a code block from the HtmlDocument.cs, ReadDocumentEncoding
method:
try
{
_declaredencoding = Encoding.GetEncoding(charset);
}
catch (ArgumentException)
{
_declaredencoding = null;
}
if (_onlyDetectEncoding)
{
throw new EncodingFoundException(_declaredencoding);
}
if (_streamencoding != null)
{
if (_declaredencoding.WindowsCodePage != _streamencoding.WindowsCodePage)
{
AddError(
HtmlParseErrorCode.CharsetMismatch,
_line, _lineposition,
_index, node.OuterHtml,
"Encoding mismatch between StreamEncoding: " +
_streamencoding.WebName + " and DeclaredEncoding: " +
_declaredencoding.WebName);
}
}
And here is my stack trace:
System.NullReferenceException was unhandled
Message=Object reference not set to an instance of an object.
Source=HtmlAgilityPack
StackTrace:
at HtmlAgilityPack.HtmlDocument.ReadDocumentEncoding(HtmlNode node) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlDocument.cs:line 1916
at HtmlAgilityPack.HtmlDocument.PushNodeEnd(Int32 index, Boolean close) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlDocument.cs:line 1805
at HtmlAgilityPack.HtmlDocument.Parse() in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlDocument.cs:line 1468
at HtmlAgilityPack.HtmlDocument.Load(TextReader reader) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlDocument.cs:line 769
at HtmlAgilityPack.HtmlDocument.Load(Stream stream, Boolean detectEncodingFromByteOrderMarks) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlDocument.cs:line 597
at HtmlAgilityPack.HtmlWeb.Get(Uri uri, String method, String path, HtmlDocument doc, IWebProxy proxy, ICredentials creds) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlWeb.cs:line 1515
at HtmlAgilityPack.HtmlWeb.LoadUrl(Uri uri, String method, WebProxy proxy, NetworkCredential creds) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlWeb.cs:line 1563
at HtmlAgilityPack.HtmlWeb.Load(String url, String method) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlWeb.cs:line 1152
at HtmlAgilityPack.HtmlWeb.Load(String url) in C:SourcehtmlagilitypackTrunkHtmlAgilityPackHtmlWeb.cs:line 1107
at test.console.Program.Main(String[] args) in W:ProjectsMeest.consoleest.consoleProgram.cs:line 54
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: