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XPathNavigator.SelectAncestors 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

Seleziona tutti i nodi predecessore del nodo corrente corrispondenti ai criteri di selezione.

Overload

SelectAncestors(XPathNodeType, Boolean)

Seleziona tutti i nodi predecessore del nodo corrente che presentano un oggetto XPathNodeType corrispondente.
SelectAncestors(String, String, Boolean)

Seleziona tutti i nodi predecessore del nodo corrente con il nome locale e l'URI dello spazio dei nomi specificati.

SelectAncestors(XPathNodeType, Boolean)

Origine:
XPathNavigator.cs
Origine:
XPathNavigator.cs
Origine:
XPathNavigator.cs

Seleziona tutti i nodi predecessore del nodo corrente che presentano un oggetto XPathNodeType corrispondente.

public:
 virtual System::Xml::XPath::XPathNodeIterator ^ SelectAncestors(System::Xml::XPath::XPathNodeType type, bool matchSelf);
public virtual System.Xml.XPath.XPathNodeIterator SelectAncestors (System.Xml.XPath.XPathNodeType type, bool matchSelf);
abstract member SelectAncestors : System.Xml.XPath.XPathNodeType * bool -> System.Xml.XPath.XPathNodeIterator
override this.SelectAncestors : System.Xml.XPath.XPathNodeType * bool -> System.Xml.XPath.XPathNodeIterator
Public Overridable Function SelectAncestors (type As XPathNodeType, matchSelf As Boolean) As XPathNodeIterator

Parametri

type
XPathNodeType

XPathNodeType dei nodi predecessore.

matchSelf
Boolean

true per includere il nodo contesto nella selezione; in caso contrario, false.

Restituisce

XPathNodeIterator

Oggetto XPathNodeIterator contenente i nodi selezionati. I nodi restituiti sono in ordine inverso rispetto al documento.

Esempio

Per un esempio di selezione dei nodi predecessori, vedere XPathNavigator.SelectAncestors.

Commenti

Il SelectAncestors metodo non ha alcun effetto sullo stato dell'oggetto XPathNavigator.

Vedi anche

Si applica a

SelectAncestors(String, String, Boolean)

Origine:
XPathNavigator.cs
Origine:
XPathNavigator.cs
Origine:
XPathNavigator.cs

Seleziona tutti i nodi predecessore del nodo corrente con il nome locale e l'URI dello spazio dei nomi specificati.

public:
 virtual System::Xml::XPath::XPathNodeIterator ^ SelectAncestors(System::String ^ name, System::String ^ namespaceURI, bool matchSelf);
public virtual System.Xml.XPath.XPathNodeIterator SelectAncestors (string name, string namespaceURI, bool matchSelf);
abstract member SelectAncestors : string * string * bool -> System.Xml.XPath.XPathNodeIterator
override this.SelectAncestors : string * string * bool -> System.Xml.XPath.XPathNodeIterator
Public Overridable Function SelectAncestors (name As String, namespaceURI As String, matchSelf As Boolean) As XPathNodeIterator

Parametri

name
String

Nome locale dei nodi predecessore.

namespaceURI
String

URI dello spazio dei nomi dei nodi predecessore.

matchSelf
Boolean

true per includere il nodo contesto nella selezione; in caso contrario, false.

Restituisce

XPathNodeIterator

Oggetto XPathNodeIterator contenente i nodi selezionati. I nodi restituiti sono in ordine inverso rispetto al documento.

Eccezioni

ArgumentNullException

null non può essere passato come parametro.

Esempio

Nell'esempio seguente viene illustrata la selezione di nodi predecessore, figlio e discendente.

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

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

// Select all the descendant nodes of the book node.
XPathNodeIterator^ bookDescendants = navigator->SelectDescendants("", "http://www.contoso.com/books", false);

// Display the LocalName of each descendant node.
Console::WriteLine("Descendant nodes of the book node:");
while (bookDescendants->MoveNext())
{
    Console::WriteLine(bookDescendants->Current->Name);
}

// Select all the child nodes of the book node.
XPathNodeIterator^ bookChildren = navigator->SelectChildren("", "http://www.contoso.com/books");

// Display the LocalName of each child node.
Console::WriteLine("\nChild nodes of the book node:");
while (bookChildren->MoveNext())
{
    Console::WriteLine(bookChildren->Current->Name);
}

// Select all the ancestor nodes of the title node.
navigator->MoveToChild("title", "http://www.contoso.com/books");

XPathNodeIterator^ bookAncestors = navigator->SelectAncestors("", "http://www.contoso.com/books", false);

// Display the LocalName of each ancestor node.
Console::WriteLine("\nAncestor nodes of the title node:");

while (bookAncestors->MoveNext())
{
    Console::WriteLine(bookAncestors->Current->Name);
}

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

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

// Select all the descendant nodes of the book node.
XPathNodeIterator bookDescendants = navigator.SelectDescendants("", "http://www.contoso.com/books", false);

// Display the LocalName of each descendant node.
Console.WriteLine("Descendant nodes of the book node:");
while (bookDescendants.MoveNext())
{
    Console.WriteLine(bookDescendants.Current.Name);
}

// Select all the child nodes of the book node.
XPathNodeIterator bookChildren = navigator.SelectChildren("", "http://www.contoso.com/books");

// Display the LocalName of each child node.
Console.WriteLine("\nChild nodes of the book node:");
while (bookChildren.MoveNext())
{
    Console.WriteLine(bookChildren.Current.Name);
}

// Select all the ancestor nodes of the title node.
navigator.MoveToChild("title", "http://www.contoso.com/books");

XPathNodeIterator bookAncestors = navigator.SelectAncestors("", "http://www.contoso.com/books", false);

// Display the LocalName of each ancestor node.
Console.WriteLine("\nAncestor nodes of the title node:");

while (bookAncestors.MoveNext())
{
    Console.WriteLine(bookAncestors.Current.Name);
}

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

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

' Select all the descendant nodes of the book node.
Dim bookDescendants As XPathNodeIterator = navigator.SelectDescendants("", "http://www.contoso.com/books", False)

' Display the LocalName of each descendant node.
Console.WriteLine("Descendant nodes of the book node:")
While bookDescendants.MoveNext()
    Console.WriteLine(bookDescendants.Current.Name)
End While

' Select all the child nodes of the book node.
Dim bookChildren As XPathNodeIterator = navigator.SelectChildren("", "http://www.contoso.com/books")

' Display the LocalName of each child node.
Console.WriteLine(vbCrLf & "Child nodes of the book node:")
While bookChildren.MoveNext()
    Console.WriteLine(bookChildren.Current.Name)
End While

' Select all the ancestor nodes of the title node.
navigator.MoveToChild("title", "http://www.contoso.com/books")

Dim bookAncestors As XPathNodeIterator = navigator.SelectAncestors("", "http://www.contoso.com/books", False)

' Display the LocalName of each ancestor node.
Console.WriteLine(vbCrLf & "Ancestor nodes of the title node:")

While bookAncestors.MoveNext()
    Console.WriteLine(bookAncestors.Current.Name)
End While

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

Se String.Empty viene specificato come name parametro, vengono selezionati tutti i nodi predecessori che appartengono all'URI dello spazio dei nomi specificato. Se String.Empty viene specificato come namespaceURI parametro, vengono selezionati tutti i nodi predecessori con il nome locale specificato che appartengono a nessuno spazio dei nomi. Se String.Empty viene specificato sia come nome locale che come URI dello spazio dei nomi, vengono selezionati tutti i nodi predecessori che appartengono a nessuno spazio dei nomi.

Il SelectAncestors metodo non ha alcun effetto sullo stato dell'oggetto XPathNavigator.

Vedi anche

Si applica a