XPathNavigator.SelectAncestors Método

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

Parâmetros

Devoluções

E XPathNodeIterator que contém os nós selecionados. Os nós devolvidos estão em ordem inversa dos documentos.

Exemplos

Para um exemplo de seleção de nós ancestrais, veja XPathNavigator.SelectAncestors.

Observações

O SelectAncestors método não tem efeito no estado do XPathNavigator.

Ver também

• SelectChildren(XPathNodeType)
• SelectDescendants(XPathNodeType, Boolean)
• Select(XPathExpression)

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

Parâmetros

Devoluções

E XPathNodeIterator que contém os nós selecionados. Os nós devolvidos estão em ordem inversa dos documentos.

Exceções

Exemplos

O exemplo seguinte ilustra a seleção de nós antepassados, filhos e descendentes.

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

O exemplo usa o contosoBooks.xml arquivo como uma entrada.

<?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>

Observações

Se String.Empty for especificado como o name parâmetro, todos os nós antepassados que pertencem ao URI do espaço de nomes especificado são selecionados. Se String.Empty for especificado como parâmetro namespaceURI , todos os nós antepassados com o nome local especificado que não pertencem a nenhum espaço de nomes são selecionados. Se String.Empty for especificado tanto como o nome local como o URI do namespace, todos os nós antepassados que não pertencem a nenhum namespace são selecionados.

O SelectAncestors método não tem efeito no estado do XPathNavigator.

Ver também

• SelectChildren(XPathNodeType)
• SelectDescendants(XPathNodeType, Boolean)
• Select(XPathExpression)