Verifying XML file problem with local DTD file in C #

Question

I am trying to validate an XML file. I am using this code

XmlReaderSettings settings = new XmlReaderSettings();
settings.ProhibitDtd = false;
settings.ValidationType = ValidationType.DTD;

settings.ValidationEventHandler += new ValidationEventHandler(validationError);        

XmlSchemaSet schemas = new XmlSchemaSet();
settings.Schemas = schemas;
XmlReader reader = XmlReader.Create(lblXmlPath.Text, settings);

reader.Settings.Schemas.Add(null, lblDTDPath.Text);
while (reader.Read())
{ 
          // empty by now
}
reader.Close();

But in the line "reader.Settings.Schemas.Add (null, lblDTDPath.Text);" Visual Studio will show me that the error "For security reasons, DTD is not allowed in this XML document. To enable DTD, set the ProhibitDtd property in XmlReaderSettings to false and pass the settings to the XmlReader.Create method"

As you can see in the code, ProhibitDtd is set to false (I also checked during debugging). I also tried adding a schema before calling XmlReader.Create () without success.

Answer 1

RSS-. DTD , XmlResolver XmlReader

XmlReaderSettings readerSettings = new XmlReaderSettings();
readerSettings.ValidationType = ValidationType.DTD;
readerSettings.ProhibitDtd = false;
readerSettings.XmlResolver = new XmlFakeDtdResolver();

DTD ( ) URL-, DOCTYPE.

class XmlFakeDtdResolver : XmlUrlResolver
{
    public static Dictionary<Uri, byte[]> dtdMap = new Dictionary<Uri, byte[]>();
    public static Dictionary<string, Uri> uriMap = new Dictionary<string, Uri>();
    static XmlFakeDtdResolver()
    {
        Uri rss091uri = new Uri("http://fake.uri/rss091");
        uriMap["-//Netscape Communications//DTD RSS 0.91//EN"] = rss091uri;
        uriMap["http://my.netscape.com/publish/formats/rss-0.91.dtd"] = rss091uri;
        dtdMap[rss091uri] = Encoding.ASCII.GetBytes(Resources.rss_0_91dtd);
    }

    public override object GetEntity(Uri absoluteUri, string role, Type ofObjectToReturn)
    {
        if (dtdMap.ContainsKey(absoluteUri) && ofObjectToReturn == typeof(Stream))
        {
            return new MemoryStream(dtdMap[absoluteUri]);
        }
        return base.GetEntity(absoluteUri, role, ofObjectToReturn);
    }

    public override Uri ResolveUri(Uri baseUri, string relativeUri)
    {
        if (uriMap.ContainsKey(relativeUri))
            return uriMap[relativeUri];
        return base.ResolveUri(baseUri, relativeUri);
    }
}

DTD XML, , DOCTYPE

Answer 2

, , XmlReader. DTD, XML-, URL-, XmlReader .

, shema , URL- DTD, , ,

<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.3//EN" "file:C:\wml.dtd">

: URL-. , XmlReader, xml , .

Answer 3

DTD XmlReader.Create.

XmlReaderSettings settings = new XmlReaderSettings();
settings.ProhibitDtd = false;
settings.ValidationType = ValidationType.DTD;

settings.ValidationEventHandler += new ValidationEventHandler(validationError);        

XmlSchemaSet schemas = new XmlSchemaSet();

schemas.Add(null, lblDTDPath.Text);
settings.Schemas = schemas;

XmlReader reader = XmlReader.Create(lblXmlPath.Text, settings);

while (reader.Read())
{ 
          // empty by now
}
reader.Close();

Answer 4

. , DTD , XML , .