503 (Server Unavailable) WebException when loading local XHTML file

Question

So I'm currently working on an ePub reader application, and I've been reading through a bunch of regular XML files just fine with System.Xml and XmlDocument:

XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(Path.Combine(Directory.GetCurrentDirectory(), "META-INF/container.xml"));
XmlNodeList xnl = xmldoc.GetElementsByTagName("rootfile");

However, now I'm trying to open the XHTML files that contain the actual book text, and they're XHTML files. Now I don't really know the difference between the two, but I'm getting the following error with this code (in the same document, using the same XmlDocument and XmlNodeList variable)

xmldoc.Load(Path.Combine(Directory.GetCurrentDirectory(), "OEBPS/part1.xhtml"));

"WebException was unhandled: The remote server returned an error: (503) Server Unavailable"

It's a local document, so I'm not understanding why it's giving this error? Any help would be greatly appreciated. :)

I've got the full source code here if it helps: http://drop.io/epubtest

(I know the ePubConstructor.ParseDocument() method is horribly messy, I'm just trying to get it working at the moment before I split it into classes)

Answer 1

Try the following untested code:

XmlDocument xmldoc = new XmlDocument(); 
XmlReaderSettings settings = new XmlReaderSettings
{
    XmlResolver = new XmlUrlResolver()
};
using (var reader = XmlReader.Create(
    Path.Combine(Directory.GetCurrentDirectory(), 
                 "OEBPS/part1.xhtml"), settings))
{
    xmlDoc.Load(reader);
}

Answer 2

Try to remove the DOCTYPE from the XHTML file, probably you have link to an external DTD.

Answer 3

Try the following code :

XmlDocument xmldoc = new XmlDocument();

doc.XmlResolver = null; // this ignores the DTD

xmldoc.Load(Path.Combine(Directory.GetCurrentDirectory(), "META-INF/container.xml"));

XmlNodeList xnl = xmldoc.GetElementsByTagName("rootfile");