XmlNamespaceManager Class

Definition

public ref class XmlNamespaceManager : System::Collections::IEnumerable, System::Xml::IXmlNamespaceResolver

public ref class XmlNamespaceManager : System::Collections::IEnumerable

public class XmlNamespaceManager : System.Collections.IEnumerable, System.Xml.IXmlNamespaceResolver

public class XmlNamespaceManager : System.Collections.IEnumerable

type XmlNamespaceManager = class
    interface IEnumerable
    interface IXmlNamespaceResolver

type XmlNamespaceManager = class
    interface IEnumerable

type XmlNamespaceManager = class
    interface IXmlNamespaceResolver
    interface IEnumerable

Public Class XmlNamespaceManager
Implements IEnumerable, IXmlNamespaceResolver

Public Class XmlNamespaceManager
Implements IEnumerable

Inheritance

Object

XmlNamespaceManager

Derived

System.Windows.Data.XmlNamespaceMappingCollection

System.Xml.Xsl.XsltContext

Implements

IEnumerable IXmlNamespaceResolver

Remarks

For general information about how namespaces are declared and used in XML documents, see Managing Namespaces in an XML Document.

XmlNamespaceManager stores prefixes and namespaces as strings. Here's a summary of management and lookup tasks you can perform with this class. For more information and examples, follow the links to the reference page for each method or property.

To add namespaces to the namespace manager, you create a XmlNamespaceManager object and then use the AddNamespace method. Default prefix and namespace pairs are automatically added to the namespace manager on creation.

When you create the namespace manager, you can specify a name table from the XmlReader, XsltContext, or XmlDocument class, and then use the AddNamespace method to add the namespaces.

You can supply the XmlNamespaceManager object as a parameter to the SelectNodes or SelectSingleNode method of the XmlDocument class to execute XPath query expressions that reference namespace-qualified element and attribute names.

The namespace manager assumes that prefixes and namespaces have already been verified and conform to the W3C Namespaces specification. The namespace manager does not perform any validation.

The namespace manager atomizes the strings when they are added by using the AddNamespace method and when a lookup is performed by using the LookupNamespace or LookupPrefix method.

The namespace manager implements enumeration support in addition to adding and retrieving namespaces. You can loop through the information saved in the namespace manager by using the foreach construct. For example, if you create a namespace manager with the name nsmanager, you can iterate through the table by using foreach (String prefix in nsmanager).

Because the namespace manager provides a string comparison with the prefix and namespaces as objects, there is a performance improvement when using the namespace manager over the direct comparison of a string.

The following code example shows how to bind the prefix xsd with the namespace URI of http://www.w3.org/2001/XMLSchema and add it to the namespace manager:

nsmgr.AddNamespace("xsd", "http://www.w3.org/2001/XMLSchema")  

nsmgr.AddNamespace("xsd", "http://www.w3.org/2001/XMLSchema");  

You can then find the namespace by using the LookupNamespace method:

nsmgr.LookupNamespace("xsd")  

nsmgr.LookupNamespace("xsd");  

The following example creates an XmlNamespaceManager by using the name table from an XML reader:

Dim reader As New XmlTextReader("myfile.xml")  
Dim nsmanager As New XmlNamespaceManager(reader.NameTable)  
nsmanager.AddNamespace("msbooks", "www.microsoft.com/books")  
nsmanager.PushScope()  
nsmanager.AddNamespace("msstore", "www.microsoft.com/store")  
While reader.Read()  
    Console.WriteLine("Reader Prefix:{0}", reader.Prefix)  
    Console.WriteLine("XmlNamespaceManager Prefix:{0}",  
     nsmanager.LookupPrefix(nsmanager.NameTable.Get(reader.NamespaceURI)))  
End While  

XmlTextReader reader = new XmlTextReader("myfile.xml");  
XmlNamespaceManager nsmanager = new XmlNamespaceManager(reader.NameTable);  
nsmanager.AddNamespace("msbooks", "www.microsoft.com/books");  
nsmanager.PushScope();  
nsmanager.AddNamespace("msstore", "www.microsoft.com/store");  
while (reader.Read())  
{  
    Console.WriteLine("Reader Prefix:{0}", reader.Prefix);  
    Console.WriteLine("XmlNamespaceManager Prefix:{0}",  
    nsmanager.LookupPrefix(nsmanager.NameTable.Get(reader.NamespaceURI)));  
}  

Constructors

Properties

Methods

Extension Methods

Applies to

See also

• XML Documents and Data
• Managing Namespaces in an XML Document