XPathNavigator.DeleteRange(XPathNavigator) Metodo

  • Riferimento

Definizione

Spazio dei nomi:
System.Xml.XPath
Assembly:
System.Xml.ReaderWriter.dll
Assembly:
System.Xml.XPath.dll
Assembly:
System.Xml.dll
Assembly:
netstandard.dll

Elimina un intervallo di nodi di pari livello dal nodo corrente per il nodo specificato.

public:
 virtual void DeleteRange(System::Xml::XPath::XPathNavigator ^ lastSiblingToDelete);
public virtual void DeleteRange (System.Xml.XPath.XPathNavigator lastSiblingToDelete);
abstract member DeleteRange : System.Xml.XPath.XPathNavigator -> unit
override this.DeleteRange : System.Xml.XPath.XPathNavigator -> unit
Public Overridable Sub DeleteRange (lastSiblingToDelete As XPathNavigator)

Parametri

lastSiblingToDelete
XPathNavigator

Oggetto XPathNavigator posizionato sull'ultimo nodo di pari livello nell'intervallo da eliminare.

Eccezioni

ArgumentNullException

L'oggetto XPathNavigator specificato è null.

NotSupportedException

XPathNavigator non supporta la modifica.

InvalidOperationException

L'ultimo nodo specificato da eliminare non è un nodo di pari livello valido del nodo corrente.

Esempio

Nell'esempio seguente vengono eliminati i primi e i secondi book elementi del contosoBooks.xml file usando il DeleteRange metodo .

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

XmlNamespaceManager^ manager = gcnew XmlNamespaceManager(document->NameTable);
manager->AddNamespace("bk", "http://www.contoso.com/books");

XPathNavigator^ first = navigator->SelectSingleNode("/bk:bookstore/bk:book[1]", manager);
XPathNavigator^ last = navigator->SelectSingleNode("/bk:bookstore/bk:book[2]", manager);

navigator->MoveTo(first);
navigator->DeleteRange(last);
Console::WriteLine(navigator->OuterXml);

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

XmlNamespaceManager manager = new XmlNamespaceManager(document.NameTable);
manager.AddNamespace("bk", "http://www.contoso.com/books");

XPathNavigator first = navigator.SelectSingleNode("/bk:bookstore/bk:book[1]", manager);
XPathNavigator last = navigator.SelectSingleNode("/bk:bookstore/bk:book[2]", manager);

navigator.MoveTo(first);
navigator.DeleteRange(last);
Console.WriteLine(navigator.OuterXml);

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

Dim manager As XmlNamespaceManager = New XmlNamespaceManager(document.NameTable)
manager.AddNamespace("bk", "http://www.contoso.com/books")

Dim first As XPathNavigator = navigator.SelectSingleNode("/bk:bookstore/bk:book[1]", manager)
Dim last As XPathNavigator = navigator.SelectSingleNode("/bk:bookstore/bk:book[2]", manager)

navigator.MoveTo(first)
navigator.DeleteRange(last)
Console.WriteLine(navigator.OuterXml)

Nell'esempio il file contosoBooks.xml viene considerato come 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>

Commenti

Il DeleteRange metodo elimina un intervallo di nodi di pari livello dal nodo corrente in cui viene posizionato (inclusivo) al nodo XPathNavigator specificato dal XPathNavigator parametro (inclusivo). L'oggetto XPathNavigator viene quindi posizionato sul nodo padre.

Si applica a