XmlTextReader.XmlResolver Property
Sets the XmlResolver used for resolving DTD references.
Assembly: System.Xml (in System.Xml.dll)
Note
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In the .NET Framework version 2.0 release, the recommended practice is to create XmlReader instances using the XmlReader.Create method. This allows you to take full advantage of the new features introduced in this release. For more information, see Creating XML Readers. |
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.
The following example uses the XmlResolver property to specify the credentials necessary to access the networked file.
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(); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
