Ignore DOCTYPE .dtd, but .dtd file must still exist

Question

I have a web service that processes an HTTP request. The document it receives has an embeded DOCTYPE that specifies a .dtd file. I wish to use a newer XML schema validation

Answer 1

The solution is to set the underlying XmlTextReader's XmlResolver to null. Changing the XmlReaderSettings.XmlResolver=null did not help, nor did setting the XmlDocument.XmlResolver=null

Here is the corrected function:

private void LoadXmlDoc(XmlTextReader myXmlTextReader)
{
    // The next line is the fix!!!
    myXmlTextReader.XmlResolver = null;  // Don't require file in system32\inetsrv

    XmlReaderSettings readerSettings = new XmlReaderSettings();
    readerSettings.ValidationType = ValidationType.Schema;
    readerSettings.Schemas.Add(null, MyGoodSchemaFile);
    readerSettings.DtdProcessing = DtdProcessing.Ignore;
    readerSettings.XmlResolver = null; // Doesn't help

    readerSettings.ValidationEventHandler += ValidationEventHandle;
    XmlReader myXmlReader = XmlReader.Create(myXmlTextReader, readerSettings);

    XmlDocument myXmlDocument = new XmlDocument();
    myXmlDocument.XmlResolver = null; // Doesn't help
    myXmlDocument.Load(myXmlReader); // Load doc, no .dtd required on local disk
}