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XPathNavigator.WriteSubtree Method

Streams the current node and its child nodes to the XmlWriter object specified.

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

public virtual void WriteSubtree(
	XmlWriter writer


Type: System.Xml.XmlWriter
The XmlWriter object to stream to.

Namespace declarations for the in-scope namespaces of the current node are inserted into the XML streamed to the XmlWriter object specified.

For example, if the WriteSubtree method is called on the first book element of the books.xml file, the namespace declaration made at the top of the XML document will appear in the XML streamed to the XmlWriter object specified as shown in the following example.

<?xml version="1.0" encoding="utf-8"?>
<book genre="autobiography" publicationdate="1981" ISBN="1-861003-11-0" xmlns="">
    <title>The Autobiography of Benjamin Franklin</title>

The WriteSubtree method does not affect the position of the XPathNavigator.

The following example illustrates using the WriteSubtree method on the first book element of the contosoBooks.xml file.

XPathDocument document = new XPathDocument("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "");
navigator.MoveToChild("book", "");

XmlWriter writer = XmlWriter.Create("contosoBook.xml");


The example takes the contosoBooks.xml file as an input.

<?xml version="1.0" encoding="utf-8" ?>
<bookstore xmlns="">
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
        <title>The Autobiography of Benjamin Franklin</title>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.