XmlTextReader.XmlResolver Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Sets the XmlResolver used for resolving DTD references.
public:
property System::Xml::XmlResolver ^ XmlResolver { void set(System::Xml::XmlResolver ^ value); };public System.Xml.XmlResolver? XmlResolver { set; }public System.Xml.XmlResolver XmlResolver { set; }member this.XmlResolver : System.Xml.XmlResolverPublic Property XmlResolver As XmlResolverProperty Value
The XmlResolver to use. If set to null, external resources are not resolved.
In version 1.1 of the .NET Framework, the caller must be fully trusted in order to specify an XmlResolver.
Examples
The following example uses the XmlResolver property to specify the credentials necessary to access the networked file.
#using <System.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Net;
int main()
{
// Create the reader.
XmlTextReader^ reader = gcnew XmlTextReader( "http://myServer/data/books.xml" );
// Supply the credentials necessary to access the Web server.
XmlUrlResolver^ resolver = gcnew XmlUrlResolver;
resolver->Credentials = CredentialCache::DefaultCredentials;
reader->XmlResolver = resolver;
// Parse the file.
while ( reader->Read() )
{
// Do any additional processing here.
}
// Close the reader.
reader->Close();
}
using System;
using System.IO;
using System.Xml;
using System.Net;
public class Sample {
public static void Main() {
// Create the reader.
XmlTextReader reader = new XmlTextReader("http://myServer/data/books.xml");
// Supply the credentials necessary to access the Web server.
XmlUrlResolver resolver = new XmlUrlResolver();
resolver.Credentials = CredentialCache.DefaultCredentials;
reader.XmlResolver = resolver;
// Parse the file.
while (reader.Read()) {
// Do any additional processing here.
}
// Close the reader.
reader.Close();
}
}
Imports System.IO
Imports System.Xml
Imports System.Net
public class Sample
public shared sub Main()
' Create the reader.
Dim reader as XmlTextReader = new XmlTextReader("http://myServer/data/books.xml")
' Supply the credentials necessary to access the Web server.
Dim resolver as XmlUrlResolver = new XmlUrlResolver()
resolver.Credentials = CredentialCache.DefaultCredentials
reader.XmlResolver = resolver
' Parse the file.
while (reader.Read())
' Do any additional processing here.
end while
' Close the reader.
reader.Close()
end sub
end class
Remarks
Note
Starting with the .NET Framework 2.0, we recommend that you create XmlReader instances by using the XmlReader.Create method to take advantage of new functionality.
The reader uses XmlResolver to resolve the location of the file loaded into the reader and also to resolve DTD references. For example, if your XML included the DOCTYPE declaration, <!DOCTYPE book SYSTEM book.dtd> the reader resolves this external file and ensures that the DTD is well-formed. The reader does not use the DTD for validation.
This property can be changed at any time and takes effect on the next read operation. If this property is set to null, any external DTD references encountered by the reader are not resolved.
In version 1.1 of the .NET Framework, if this property is not set, the trust level of the application determines the default behavior.
Fully trusted code: The reader uses a default XmlUrlResolver with no user credentials. If authentication is required to access a network resource, use the XmlResolver property to specify an XmlResolver with the necessary credentials.
Semi-trusted code: The XmlResolver property is set to null. External resources are not resolved.
