XPathNavigator.InsertBefore Method

Reference

Definition

Namespace:: System.Xml.XPath

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.XPath.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

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.

Creates a new sibling node before the currently selected node.

Overloads

InsertBefore()	Returns an XmlWriter object used to create a new sibling node before the currently selected node.
InsertBefore(String)	Creates a new sibling node before the currently selected node using the XML string specified.
InsertBefore(XmlReader)	Creates a new sibling node before the currently selected node using the XML contents of the XmlReader object specified.
InsertBefore(XPathNavigator)	Creates a new sibling node before the currently selected node using the nodes in the XPathNavigator specified.

InsertBefore()

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Returns an XmlWriter object used to create a new sibling node before the currently selected node.

public:
 virtual System::Xml::XmlWriter ^ InsertBefore();

public virtual System.Xml.XmlWriter InsertBefore ();

abstract member InsertBefore : unit -> System.Xml.XmlWriter
override this.InsertBefore : unit -> System.Xml.XmlWriter

Public Overridable Function InsertBefore () As XmlWriter

Returns

XmlWriter

An XmlWriter object used to create a new sibling node before the currently selected node.

Exceptions

InvalidOperationException

The position of the XPathNavigator does not allow a new sibling node to be inserted before the current node.

NotSupportedException

The XPathNavigator does not support editing.

Examples

In the following example a new pages element is inserted before the price child element of the first book element in the contosoBooks.xml file using the XmlWriter object returned by the InsertBefore method.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");
navigator->MoveToChild("price", "http://www.contoso.com/books");

XmlWriter^ pages = navigator->InsertBefore();
pages->WriteElementString("pages", "100");
pages->Close();

navigator->MoveToParent();
Console::WriteLine(navigator->OuterXml);

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

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");
navigator.MoveToChild("price", "http://www.contoso.com/books");

XmlWriter pages = navigator.InsertBefore();
pages.WriteElementString("pages", "100");
pages.Close();

navigator.MoveToParent();
Console.WriteLine(navigator.OuterXml);

Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")
navigator.MoveToChild("price", "http://www.contoso.com/books")

Dim pages As XmlWriter = navigator.InsertBefore()
pages.WriteElementString("pages", "100")
pages.Close()

navigator.MoveToParent()
Console.WriteLine(navigator.OuterXml)

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

<?xml version="1.0" encoding="utf-8" ?>  
<bookstore xmlns="http://www.contoso.com/books">  
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">  
        <title>The Autobiography of Benjamin Franklin</title>  
        <author>  
            <first-name>Benjamin</first-name>  
            <last-name>Franklin</last-name>  
        </author>  
        <price>8.99</price>  
    </book>  
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">  
        <title>The Confidence Man</title>  
        <author>  
            <first-name>Herman</first-name>  
            <last-name>Melville</last-name>  
        </author>  
        <price>11.99</price>  
    </book>  
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">  
        <title>The Gorgias</title>  
        <author>  
            <name>Plato</name>  
        </author>  
        <price>9.99</price>  
    </book>  
</bookstore>

Remarks

The following are important notes to consider when using the InsertBefore method.

The new sibling node is not inserted until the Close method of the XmlWriter object is called.
The InsertBefore method is valid only when the XPathNavigator is positioned on an element, text, processing instruction, or comment node.
The InsertBefore method does not affect the position of the XPathNavigator.

Applies to

InsertBefore(String)

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Creates a new sibling node before the currently selected node using the XML string specified.

public:
 virtual void InsertBefore(System::String ^ newSibling);

public virtual void InsertBefore (string newSibling);

abstract member InsertBefore : string -> unit
override this.InsertBefore : string -> unit

Public Overridable Sub InsertBefore (newSibling As String)

Parameters

newSibling: String

The XML data string for the new sibling node.

Exceptions

ArgumentNullException

The XML string parameter is null.

InvalidOperationException

The position of the XPathNavigator does not allow a new sibling node to be inserted before the current node.

NotSupportedException

The XPathNavigator does not support editing.

XmlException

The XML string parameter is not well-formed.

Examples

In the following example a new pages element is inserted before the price child element of the first book element in the contosoBooks.xml file.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");
navigator->MoveToChild("price", "http://www.contoso.com/books");

navigator->InsertBefore("<pages>100</pages>");

navigator->MoveToParent();
Console::WriteLine(navigator->OuterXml);

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

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");
navigator.MoveToChild("price", "http://www.contoso.com/books");

navigator.InsertBefore("<pages>100</pages>");

navigator.MoveToParent();
Console.WriteLine(navigator.OuterXml);

Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")
navigator.MoveToChild("price", "http://www.contoso.com/books")

navigator.InsertBefore("<pages>100</pages>")

navigator.MoveToParent()
Console.WriteLine(navigator.OuterXml)

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

<?xml version="1.0" encoding="utf-8" ?>  
<bookstore xmlns="http://www.contoso.com/books">  
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">  
        <title>The Autobiography of Benjamin Franklin</title>  
        <author>  
            <first-name>Benjamin</first-name>  
            <last-name>Franklin</last-name>  
        </author>  
        <price>8.99</price>  
    </book>  
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">  
        <title>The Confidence Man</title>  
        <author>  
            <first-name>Herman</first-name>  
            <last-name>Melville</last-name>  
        </author>  
        <price>11.99</price>  
    </book>  
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">  
        <title>The Gorgias</title>  
        <author>  
            <name>Plato</name>  
        </author>  
        <price>9.99</price>  
    </book>  
</bookstore>

Remarks

To create a new element node, include all XML syntax in the XML string parameter. The string for a new book node is InsertBefore("<book/>"). The string for inserting the text "book" before the current node's text node is InsertBefore("book"). If the XML string contains multiple nodes, all nodes are added.

The following are important notes to consider when using the InsertBefore method.

The InsertBefore method is valid only when the XPathNavigator is positioned on an element, text, processing instruction, or comment node.
The InsertBefore method does not affect the position of the XPathNavigator.

Applies to

InsertBefore(XmlReader)

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Creates a new sibling node before the currently selected node using the XML contents of the XmlReader object specified.

public:
 virtual void InsertBefore(System::Xml::XmlReader ^ newSibling);

public virtual void InsertBefore (System.Xml.XmlReader newSibling);

abstract member InsertBefore : System.Xml.XmlReader -> unit
override this.InsertBefore : System.Xml.XmlReader -> unit

Public Overridable Sub InsertBefore (newSibling As XmlReader)

Parameters

newSibling: XmlReader

An XmlReader object positioned on the XML data for the new sibling node.

Exceptions

ArgumentException

The XmlReader object is in an error state or closed.

ArgumentNullException

The XmlReader object parameter is null.

InvalidOperationException

The position of the XPathNavigator does not allow a new sibling node to be inserted before the current node.

NotSupportedException

The XPathNavigator does not support editing.

XmlException

The XML contents of the XmlReader object parameter is not well-formed.

Examples

In the following example a new pages element is inserted before the price child element of the first book element in the contosoBooks.xml file using the XmlReader object specified. The http://www.contoso.com/books namespace is specified so that the new sibling element is inserted using the same namespace as the XML document.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");
navigator->MoveToChild("price", "http://www.contoso.com/books");

XmlReader^ pages = XmlReader::Create(gcnew StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));

navigator->InsertBefore(pages);

navigator->MoveToParent();
Console::WriteLine(navigator->OuterXml);

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

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");
navigator.MoveToChild("price", "http://www.contoso.com/books");

XmlReader pages = XmlReader.Create(new StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));

navigator.InsertBefore(pages);

navigator.MoveToParent();
Console.WriteLine(navigator.OuterXml);

Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")
navigator.MoveToChild("price", "http://www.contoso.com/books")

Dim pages As XmlReader = XmlReader.Create(New StringReader("<pages xmlns='http://www.contoso.com/books'>100</pages>"))

navigator.InsertBefore(pages)

navigator.MoveToParent()
Console.WriteLine(navigator.OuterXml)

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

<?xml version="1.0" encoding="utf-8" ?>  
<bookstore xmlns="http://www.contoso.com/books">  
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">  
        <title>The Autobiography of Benjamin Franklin</title>  
        <author>  
            <first-name>Benjamin</first-name>  
            <last-name>Franklin</last-name>  
        </author>  
        <price>8.99</price>  
    </book>  
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">  
        <title>The Confidence Man</title>  
        <author>  
            <first-name>Herman</first-name>  
            <last-name>Melville</last-name>  
        </author>  
        <price>11.99</price>  
    </book>  
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">  
        <title>The Gorgias</title>  
        <author>  
            <name>Plato</name>  
        </author>  
        <price>9.99</price>  
    </book>  
</bookstore>

Remarks

The following are important notes to consider when using the InsertBefore method.

If the XmlReader object is positioned over a sequence of XML nodes, all the nodes in the sequence are added.
The InsertBefore method is valid only when the XPathNavigator is positioned on an element, text, processing instruction, or comment node.
The InsertBefore method does not affect the position of the XPathNavigator.

Applies to

InsertBefore(XPathNavigator)

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Creates a new sibling node before the currently selected node using the nodes in the XPathNavigator specified.

public:
 virtual void InsertBefore(System::Xml::XPath::XPathNavigator ^ newSibling);

public virtual void InsertBefore (System.Xml.XPath.XPathNavigator newSibling);

abstract member InsertBefore : System.Xml.XPath.XPathNavigator -> unit
override this.InsertBefore : System.Xml.XPath.XPathNavigator -> unit

Public Overridable Sub InsertBefore (newSibling As XPathNavigator)

Parameters

newSibling: XPathNavigator

An XPathNavigator object positioned on the node to add as the new sibling node.

Exceptions

ArgumentNullException

The XPathNavigator object parameter is null.

InvalidOperationException

The position of the XPathNavigator does not allow a new sibling node to be inserted before the current node.

NotSupportedException

The XPathNavigator does not support editing.

Examples

In the following example a new pages element is inserted before the price child element of the first book element in the contosoBooks.xml file using the node contained in the XPathNavigator object specified. The http://www.contoso.com/books namespace is specified so that the new sibling element is inserted using the same namespace as the XML document.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");
navigator->MoveToChild("price", "http://www.contoso.com/books");

XmlDocument^ childNodes = gcnew XmlDocument();
childNodes->Load(gcnew StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));
XPathNavigator^ childNodesNavigator = childNodes->CreateNavigator();

navigator->InsertBefore(childNodesNavigator);

navigator->MoveToParent();
Console::WriteLine(navigator->OuterXml);

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

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");
navigator.MoveToChild("price", "http://www.contoso.com/books");

XmlDocument childNodes = new XmlDocument();
childNodes.Load(new StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));
XPathNavigator childNodesNavigator = childNodes.CreateNavigator();

navigator.InsertBefore(childNodesNavigator);

navigator.MoveToParent();
Console.WriteLine(navigator.OuterXml);

Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")
navigator.MoveToChild("price", "http://www.contoso.com/books")

Dim childNodes As XmlDocument = New XmlDocument()
childNodes.Load(New StringReader("<pages xmlns='http://www.contoso.com/books'>100</pages>"))
Dim childNodesNavigator As XPathNavigator = childNodes.CreateNavigator()

navigator.InsertBefore(childNodesNavigator)

navigator.MoveToParent()
Console.WriteLine(navigator.OuterXml)

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

<?xml version="1.0" encoding="utf-8" ?>  
<bookstore xmlns="http://www.contoso.com/books">  
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">  
        <title>The Autobiography of Benjamin Franklin</title>  
        <author>  
            <first-name>Benjamin</first-name>  
            <last-name>Franklin</last-name>  
        </author>  
        <price>8.99</price>  
    </book>  
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">  
        <title>The Confidence Man</title>  
        <author>  
            <first-name>Herman</first-name>  
            <last-name>Melville</last-name>  
        </author>  
        <price>11.99</price>  
    </book>  
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">  
        <title>The Gorgias</title>  
        <author>  
            <name>Plato</name>  
        </author>  
        <price>9.99</price>  
    </book>  
</bookstore>

Remarks

The following are important notes to consider when using the InsertBefore method.

If the XPathNavigator object is positioned over a sequence of XML nodes, all the nodes in the sequence are added.
The InsertBefore method is valid only when the XPathNavigator is positioned on an element, text, processing instruction, or comment node.
The InsertBefore method does not affect the position of the XPathNavigator.

Applies to

Condividi tramite

XPathNavigator.InsertBefore Method

Definition

Overloads

InsertBefore()

Returns

Exceptions

Examples

Remarks

Applies to

InsertBefore(String)

Parameters

Exceptions

Examples

Remarks

Applies to

InsertBefore(XmlReader)

Parameters

Exceptions

Examples

Remarks

Applies to

InsertBefore(XPathNavigator)

Parameters

Exceptions

Examples

Remarks

Applies to

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