> I have a XML document (not of my making) which starts like that:
> ==========
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
> "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
> <plist version="1.0">
> <dict>
> ........................
> ==========
>
> I read it with code such as:
> Stream s = .....
> using(XmlTextReader xtr = new XmlTextReader(s))
> {
>    xtr.MoveToContent(); // <<== problem here
>    xr.Read();
>    .....
> }
>
> The problem that I have is, if the user's computer is not connected to a
> network, the xtr.MoveToContent() fail with the following exception:
> =========
> Stack    :
>    at System.Xml.XmlTextReaderImpl.Throw(Exception e)
>    at System.Xml.XmlTextReaderImpl.DtdParserProxy_PushExternalSubset
> (String systemId, String publicId)
>    at
> System.Xml.XmlTextReaderImpl.DtdParserProxy.System.Xml.IDtdParserAdapter
> .PushExternalSubset(String systemId, String publicId)
>    at System.Xml.DtdParser.ParseExternalSubset()
>    at System.Xml.DtdParser.ParseInDocumentDtd(Boolean
> saveInternalSubset)
>    at System.Xml.DtdParser.Parse(Boolean saveInternalSubset)
>    at System.Xml.XmlTextReaderImpl.ParseDoctypeDecl()
>    at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
>    at System.Xml.XmlTextReaderImpl.Read()
>    at System.Xml.XmlReader.MoveToContent()
> -------- Caused by Exception --------
> Exception : System.Net.WebException
> Message   : Unable to connect to the remote server
> Source    : System
> Help      :
> Stack    :
>    at System.Net.HttpWebRequest.GetResponse()
>    at System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri,
> ICredentials credentials)
>    at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials
> credentials)
>    at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String
> role, Type ofObjectToReturn)
>    at System.Xml.XmlTextReaderImpl.OpenStream(Uri uri)
>    at System.Xml.XmlTextReaderImpl.DtdParserProxy_PushExternalSubset
> (String systemId, String publicId)
>
> -------- Caused by Exception --------
> Exception : System.Net.Sockets.SocketException
> Message   : A socket operation was attempted to an unreachable host
> Source    : System
> Help      :
> Stack    :
>    at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot,
> SocketAddress socketAddress)
>    at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
>    at System.Net.ServicePoint.ConnectSocketInternal(Boolean
> connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress&
> address, ConnectSocketState state, IAsyncResult asyncResult, Int32
> timeout, Exception& exception)
>
> =========
>
> But I absolutely don't care about the DTD, in fact there is nothing at
> this URL.
> I try many various settings, but I can't see a way to get around this
> problem other than a try/catch.

"Oleg Tkachenko [MVP]" <s***@body.com> wrote in message
news:%23swQjoLgHHA.1220@TK2MSFTNGP03.phx.gbl...
> Lloyd Dupont wrote:
>> I have a XML document (not of my making) which starts like that:
>> ==========
>> <?xml version="1.0" encoding="UTF-8"?>
>> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
>> "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
>> <plist version="1.0">
>> <dict>
>> ........................
>> ==========
>>
>> I read it with code such as:
>> Stream s = .....
>> using(XmlTextReader xtr = new XmlTextReader(s))
>> {
>>    xtr.MoveToContent(); // <<== problem here
>>    xr.Read();
>>    .....
>> }
>>
>> The problem that I have is, if the user's computer is not connected to a
>> network, the xtr.MoveToContent() fail with the following exception:
>> =========
>> Stack    :
>>    at System.Xml.XmlTextReaderImpl.Throw(Exception e)
>>    at System.Xml.XmlTextReaderImpl.DtdParserProxy_PushExternalSubset
>> (String systemId, String publicId)
>>    at
>> System.Xml.XmlTextReaderImpl.DtdParserProxy.System.Xml.IDtdParserAdapter
>> .PushExternalSubset(String systemId, String publicId)
>>    at System.Xml.DtdParser.ParseExternalSubset()
>>    at System.Xml.DtdParser.ParseInDocumentDtd(Boolean
>> saveInternalSubset)
>>    at System.Xml.DtdParser.Parse(Boolean saveInternalSubset)
>>    at System.Xml.XmlTextReaderImpl.ParseDoctypeDecl()
>>    at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
>>    at System.Xml.XmlTextReaderImpl.Read()
>>    at System.Xml.XmlReader.MoveToContent()
>> -------- Caused by Exception --------
>> Exception : System.Net.WebException
>> Message   : Unable to connect to the remote server
>> Source    : System
>> Help      :
>> Stack    :
>>    at System.Net.HttpWebRequest.GetResponse()
>>    at System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri,
>> ICredentials credentials)
>>    at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials
>> credentials)
>>    at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String
>> role, Type ofObjectToReturn)
>>    at System.Xml.XmlTextReaderImpl.OpenStream(Uri uri)
>>    at System.Xml.XmlTextReaderImpl.DtdParserProxy_PushExternalSubset
>> (String systemId, String publicId)
>>
>> -------- Caused by Exception --------
>> Exception : System.Net.Sockets.SocketException
>> Message   : A socket operation was attempted to an unreachable host
>> Source    : System
>> Help      :
>> Stack    :
>>    at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot,
>> SocketAddress socketAddress)
>>    at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
>>    at System.Net.ServicePoint.ConnectSocketInternal(Boolean
>> connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress&
>> address, ConnectSocketState state, IAsyncResult asyncResult, Int32
>> timeout, Exception& exception)
>>
>> =========
>>
>> But I absolutely don't care about the DTD, in fact there is nothing at
>> this URL.
>> I try many various settings, but I can't see a way to get around this
>> problem other than a try/catch.
>
> XmlReader always checks if DTD exists (to make sure document is
> wellformed), it doesn't actually parse it. So the solution is to provide
> to XmlReader custom XmlResolver, which will return something dummy when
> requested to resolve "http://www.apple.com/DTDs/PropertyList-1.0.dtd".
>
>
> --
> Oleg Tkachenko [XML MVP, MCPD]
> http://blog.tkachenko.com | http://www.XmlLab.Net | http://www.XLinq.Net