XmlNamespaceManager Class
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XmlNamespaceManager Class


Resolves, adds, and removes namespaces to a collection and provides scope management for these namespaces.

Namespace:   System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public class XmlNamespaceManager : IXmlNamespaceResolver, IEnumerable


Initializes a new instance of the XmlNamespaceManager class with the specified XmlNameTable.


Gets the namespace URI for the default namespace.


Gets the XmlNameTable associated with this object.

System_CAPS_pubmethodAddNamespace(String, String)

Adds the given namespace to the collection.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Returns an enumerator to use to iterate through the namespaces in the XmlNamespaceManager.


Serves as the default hash function. (Inherited from Object.)


Gets a collection of namespace names keyed by prefix which can be used to enumerate the namespaces currently in scope.


Gets the Type of the current instance.(Inherited from Object.)


Gets a value indicating whether the supplied prefix has a namespace defined for the current pushed scope.


Gets the namespace URI for the specified prefix.


Finds the prefix declared for the given namespace URI.


Creates a shallow copy of the current Object.(Inherited from Object.)


Pops a namespace scope off the stack.


Pushes a namespace scope onto the stack.

System_CAPS_pubmethodRemoveNamespace(String, String)

Removes the given namespace for the given prefix.


Returns a string that represents the current object.(Inherited from Object.)


Overloaded. Enables parallelization of a query.(Defined by ParallelEnumerable.)


Overloaded. Converts an IEnumerable to an IQueryable.(Defined by Queryable.)


Casts the elements of an IEnumerable to the specified type.(Defined by Enumerable.)


Filters the elements of an IEnumerable based on a specified type.(Defined by Enumerable.)

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.



Add a namespace

AddNamespace method

Remove a namespace

RemoveNamespace method

Find the URI for the default namespace

DefaultNamespace property

Find the URI for a namespace prefix

LookupNamespace method

Find the prefix for a namespace URI

LookupPrefix method

Get a list of namespaces in the current node

GetNamespacesInScope method

Scope a namespace

PushScope and PopScope methods

Check whether a prefix is defined in the current scope

HasNamespace method

Get the name table used to look up prefixes and URIs

NameTable 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");

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


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

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

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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