joh*_*est 3 c# silverlight windows-phone-7
我在WP7应用程序和C#3.5应用程序中运行完全相同的代码.在WP7应用程序将引发NotSupportedException在调用XDocument.Parse(),而C#3.5应用程序解析没有问题的XML.以下是使用的代码:
WebClient client = new WebClient();
client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadThreadsComplete);
client.DownloadStringAsync(new Uri("http://us.battle.net/sc2/en/forum/40568/", UriKind.Absolute));
...
private static void DownloadThreadsComplete(object sender, DownloadStringCompletedEventArgs e)
{
var doc = XDocument.Parse(e.Result);
}
知道为什么会这样吗？奇怪的是,当一个魔兽世界论坛工作得很好时(http://us.battle.net/wow/en/forum/984270/)尝试解析SC2论坛时失败了.
编辑:
异常消息是"NotSupportedException".这是完整的堆栈跟踪:
at System.Xml.XmlTextReaderImpl.ParseDoctypeDecl()
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at System.Xml.Linq.XDocument.Parse(String text, LoadOptions options)
at System.Xml.Linq.XDocument.Parse(String text)
at SC2ForumReader.Pages.ForumViewerPage.DownloadThreadsComplete(Object sender, DownloadStringCompletedEventArgs e)
at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
at System.Reflection.RuntimeMethodInfo.InternalInvoke(RuntimeMethodInfo rtmi, Object obj, BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess, StackCrawlMark& stackMark)
at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at System.Delegate.DynamicInvokeOne(Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(Object[] args)
at System.Delegate.DynamicInvoke(Object[] args)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.Dispatch(DispatcherPriority priority)
at System.Windows.Threading.Dispatcher.OnInvoke(Object context)
at System.Windows.Hosting.CallbackCookie.Invoke(Object[] args)
at System.Windows.Hosting.DelegateWrapper.InternalInvoke(Object[] args)
at System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(IntPtr pHandle, Int32 nParamCount, ScriptParam[] pParams, ScriptParam& pResult)
EDIT2:
我已完成建议,并查看了2个不同请求的输出.此外,在我的3.5客户端应用程序中,我强制用户代理与WP7仿真器中的用户代理相同,以确保它不是导致问题的用户代理.
这是从Visual Studio复制的doctype声明:
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">
每个文档中的doctypes都是相同的,但是文件中有一些差异很突出(看起来在3.5方面插入了一些额外的字符):
WP7模拟器: StarCraft II
3.5申请: StarCraft II
问题是XDocument.Parse启用了DTD处理(默认情况下通常在XmlTextReader上禁用)但它不提供解析器.请尝试使用此代码:
private static void DownloadThreadsComplete(object sender, DownloadStringCompletedEventArgs e)
{
XDocument doc;
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Ignore;
using (XmlReader reader = XmlReader.Create(new StringReader(e.Result), settings))
{
doc = XDocument.Load(reader);
}
// Do stuff with doc
}
要么:-
private static void DownloadThreadsComplete(object sender, DownloadStringCompletedEventArgs e)
{
XDocument doc;
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Parse;
settings.XmlResolver = new XmlPreloadedResolver(XmlKnownDtds.Xhtml10);
using (XmlReader reader = XmlReader.Create(new StringReader(e.Result), settings))
{
doc = XDocument.Load(reader);
}
// Do stuff with doc
}