------- I have also posted this to the microsoft.publi c.xml group but I
am not sure which one it belongs in ------
OK - I have an XML file from a vendor that uses a DTD files as follows:
<!DOCTYPE metis PUBLIC "-//METIS/METIS XML 1.2//EN"
"http://xml.metis.no/metis12.dtd">
The problem is - currently and periodically - the vendor takes the dtd
file offline. Thus, when I am trying to open the XML document in
Vb.Net using the following code:
Private iobj_MetisModel As New XmlDocument
iobj_MetisModel .Load(is_Path_T o_Metis_File)
The load is failing with a SocketException because the DTD is not
available (see full stack trace below). I am only reading the XML and
doing some Xpath queries on it. Any idea how I can tell the XML
document to simply continue if it cannot access the DTD?
-------------------------------- Stack Trace
-----------------------------------
MetisReporting: An error occurred while the Metis Reporting System
process was running. Full details are below. System.Net.WebE xception:
Unable to connect to the remote server --->
System.Net.Sock ets.SocketExcep tion: A connection attempt failed because
the connected party did not properly respond after a period of time, or
established connection failed because connected host has failed to
respond
at System.Net.Sock ets.Socket.DoCo nnect(EndPoint endPointSnapsho t,
SocketAddress socketAddress)
at System.Net.Sock ets.Socket.Inte rnalConnect(End Point remoteEP)
at System.Net.Serv icePoint.Connec tSocketInternal (Boolean
connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress&
address, ConnectSocketSt ate state, IAsyncResult asyncResult, Int32
timeout, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.Http WebRequest.GetR esponse()
at System.Xml.XmlD ownloadManager. GetNonFileStrea m(Uri uri,
ICredentials credentials)
at System.Xml.XmlD ownloadManager. GetStream(Uri uri, ICredentials
credentials)
at System.Xml.XmlU rlResolver.GetE ntity(Uri absoluteUri, String role,
Type ofObjectToRetur n)
at System.Xml.XmlT extReaderImpl.O penStream(Uri uri)
at
System.Xml.XmlT extReaderImpl.D tdParserProxy_P ushExternalSubs et(String
systemId, String publicId)
at
System.Xml.XmlT extReaderImpl.D tdParserProxy.S ystem.Xml.IDtdP arserAdapter.Pu shExternalSubse t(String
systemId, String publicId)
at System.Xml.DtdP arser.ParseExte rnalSubset()
at System.Xml.DtdP arser.ParseInDo cumentDtd(Boole an
saveInternalSub set)
at System.Xml.DtdP arser.Parse(Boo lean saveInternalSub set)
at System.Xml.XmlT extReaderImpl.P arseDoctypeDecl ()
at System.Xml.XmlT extReaderImpl.P arseDocumentCon tent()
at System.Xml.XmlT extReaderImpl.R ead()
at System.Xml.XmlL oader.LoadNode( Boolean skipOverWhitesp ace)
at System.Xml.XmlL oader.LoadDocSe quence(XmlDocum ent parentDoc)
at System.Xml.XmlL oader.Load(XmlD ocument doc, XmlReader reader,
Boolean preserveWhitesp ace)
at System.Xml.XmlD ocument.Load(Xm lReader reader)
at System.Xml.XmlD ocument.Load(St ring filename)
at MetisDatabaseCl ass.MetisToData base.LoadMetisX MLDocument() in
D:\Visual Studio 2005
Projects\MetisT oDB\MetisDataba seClass\Convert MetisXMLToDatab ase.vb:line
223
at MetisDatabaseCl ass.MetisToData base.GetContain ers(TreeView&
pobj_TreeView) in D:\Visual Studio 2005
Projects\MetisT oDB\MetisDataba seClass\Convert MetisXMLToDatab ase.vb:line
359
at
MetisToDBFrontE nd.frmMetisDBFr ontEnd.frmMetis DBFrontEnd_Load (Object
sender, EventArgs e) in D:\Visual Studio 2005
Projects\MetisT oDB\MetisToDBFr ontEnd\frmMetis DBFrontEnd.vb:l ine 61
at System.Windows. Forms.Form.OnLo ad(EventArgs e)
at System.Windows. Forms.Form.OnCr eateControl()
at System.Windows. Forms.Control.C reateControl(Bo olean
fIgnoreVisible)
at System.Windows. Forms.Control.C reateControl()
at System.Windows. Forms.Control.W mShowWindow(Mes sage& m)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)
at System.Windows. Forms.Container Control.WndProc (Message& m)
at System.Windows. Forms.Form.WmSh owWindow(Messag e& m)
at System.Windows. Forms.Form.WndP roc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage&
m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows. Forms.SafeNativ eMethods.ShowWi ndow(HandleRef hWnd,
Int32 nCmdShow)
at System.Windows. Forms.Control.S etVisibleCore(B oolean value)
at System.Windows. Forms.Form.SetV isibleCore(Bool ean value)
at System.Windows. Forms.Control.s et_Visible(Bool ean value)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at MetisToDBFrontE nd.startupModul e.Main() in D:\Visual Studio 2005
Projects\MetisT oDB\MetisToDBFr ontEnd\startupM odule.vb:line 12
1  3966 
Ok - So the following solution works:
Dim lobj_XMLTextRea der As XmlTextReader
Dim iobj_MetisModel As New XmlDocument
'Start up the XmlTextReader - using this to override the
XMLResolver
lobj_XMLTextRea der = New XmlTextReader(i s_Path_To_File)
lobj_XMLTextRea der.XmlResolver = Nothing
iobj_MetisModel .Load(lobj_XMLT extReader)
this was a pain - I hope it helps others :)
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