W8 电话 System.Xml.XmlException &答案

【问题标题】：W8 Phone System.Xml.XmlException &W8 电话 System.Xml.XmlException &
【发布时间】：2014-10-25 13:01:14
【问题描述】：

这段代码显示没有错误，但运行时一直崩溃，下面是代码，然后是调试输出；

using System.Xml;
using System.Net;
using System.ServiceModel.Syndication;

XmlReaderSettings settings = new XmlReaderSettings();
        settings.DtdProcessing = DtdProcessing.Ignore;

        XmlReader reader = XmlReader.Create("https://news.google.com/news/feeds?pz=1&cf=all&ned=uk&hl=en&q=" + "google" + "&output=rss", settings);
        SyndicationFeed feed = SyndicationFeed.Load(reader);
        reader.Close();

这是调试输出：

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.ni.dll
A first chance exception of type 'System.ArgumentException' occurred in System.Windows.ni.dll
'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\en-US\System.Xml.debug.resources.DLL'. Module was built without symbols.
A first chance exception of type 'System.Xml.XmlException' occurred in System.Xml.ni.dll
'TaskHost.exe' (CoreCLR: Silverlight AppDomain): Loaded 'C:\windows\system32\en-US\mscorlib.debug.resources.dll'. Module was built without symbols.
A first chance exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.ni.dll
A first chance exception of type 'System.Reflection.TargetInvocationException' occurred in Microsoft.Phone.ni.dll

调用堆栈信息：

project.DLL!project.App.RootFrame_NavigationFailed(object sender, System.Windows.Navigation.NavigationFailedEventArgs e) 第 90 行 C# Microsoft.Phone.ni.dll!System.Windows.Navigation.NavigationService.RaiseNavigationFailed(System.Uri uri, System.Exception 异常) 未知 Microsoft.Phone.ni.dll!System.Windows.Navigation.NavigationService.ContentLoader_BeginLoad_Callback(System.IAsyncResult 结果) 未知 Microsoft.Phone.ni.dll!System.Windows.Navigation.PageResourceContentLoader.BeginLoad_OnUIThread(System.AsyncCallback userCallback, System.Windows.Navigation.PageResourceContentLoader.PageResourceContentLoaderAsyncResult 结果) 未知 Microsoft.Phone.ni.dll!System.Windows.Navigation.PageResourceContentLoader.BeginLoad.AnonymousMethod__0(object args) 未知 [本机到托管转换]
mscorlib.ni.dll!System.Delegate.DynamicInvokeImpl(object[] args) 未知 System.Windows.ni.dll!System.Windows.Threading.DispatcherOperation.Invoke() 未知 System.Windows.ni.dll!System.Windows.Threading.Dispatcher.Dispatch(System.Windows.Threading.DispatcherPriority 优先级) 未知 System.Windows.ni.dll!System.Windows.Threading.Dispatcher.OnInvoke（对象上下文）未知 System.Windows.ni.dll!System.Windows.Hosting.CallbackCookie.Invoke(object[] args) 未知 System.Windows.RuntimeHost.ni.dll!System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(System.IntPtr pHandle, int nParamCount, System.Windows.Hosting.NativeMethods.ScriptParam* pParams, System.Windows.Hosting.NativeMethods.ScriptParam* pResult) 未知

感谢您的帮助

【问题讨论】：

你要读取的文件是否存在？
@Arpad 是的，it is。我试过了，它似乎有效。
它显示了在运行@LajosArpad 时出现在 mscorlib.ni.dll 错误中的“System.IO.FileNotFoundException”类型的第一次机会异常

标签： c# xml windows windows-phone-8 syndication

【解决方案1】：

public void FileDownloadComplete(对象发送者，DownloadStringCompletedEventArgs e) { // e.Result 将包含文件一个字节一个字节

// your settings
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Ignore;

// create a memory stream for us to use from the bytes of the downloaded file
MemoryStream ms = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(e.Result ?? ""));

// create your reader from the stream of bytes
XmlReader reader = XmlReader.Create(ms, settings);

// do whatever you want with the reader
// ........

// close
reader.Close()

【讨论】：