XPathNavigator.ValueType Egenskap

public:
 virtual property Type ^ ValueType { Type ^ get(); };

public override Type ValueType { get; }

member this.ValueType : Type

Public Overrides ReadOnly Property ValueType As Type

Egenskapsvärde

den aktuella nodens .NET Type. Standardvärdet är String.

Exempel

I följande exempel contosoBooks.xml används XML-filen och contosoBooks.xsd XSD-schemat (XML Schema Definition Language) för att skapa ett XPathNavigator objekt. Elementets price typade värde visas med hjälp av ValueType egenskapen och returneras sedan som en sträng med metoden ValueAs .

// Create an XmlReaderSettings object with the contosoBooks.xsd schema.
XmlReaderSettings settings = new XmlReaderSettings();
settings.Schemas.Add("http://www.contoso.com/books", "contosoBooks.xsd");
settings.ValidationType = ValidationType.Schema;

// Create an XmlReader object with the contosoBooks.xml file and its schema.
XmlReader reader = XmlReader.Create("contosoBooks.xml", settings);

XPathDocument document = new XPathDocument(reader);
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");

// Display the current type of the price element.
Console.WriteLine(navigator.ValueType);

// Get the value of the price element as a string and display it.
string price = navigator.ValueAs(typeof(string)) as string;
Console.WriteLine(price);

' Create an XmlReaderSettings object with the contosoBooks.xsd schema.
Dim settings As XmlReaderSettings = New XmlReaderSettings()
settings.Schemas.Add("http://www.contoso.com/books", "contosoBooks.xsd")
settings.ValidationType = ValidationType.Schema

' Create an XmlReader object with the contosoBooks.xml file and its schema.
Dim reader As XmlReader = XmlReader.Create("contosoBooks.xml", settings)

Dim document As XPathDocument = New XPathDocument(reader)
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")

' Display the current type of the price element.
Console.WriteLine(navigator.ValueType)

' Get the value of the price element as a string and display it.
Dim price As String = navigator.ValueAs(GetType(String))
Console.WriteLine(price)

Exemplet tar contosoBooks.xml filen som indata.

<?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>

Exemplet tar contosoBooks.xsd också som indata.

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.contoso.com/books" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="bookstore">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" name="book">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="title" type="xs:string" />
                            <xs:element name="author">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element minOccurs="0" name="name" type="xs:string" />
                                        <xs:element minOccurs="0" name="first-name" type="xs:string" />
                                        <xs:element minOccurs="0" name="last-name" type="xs:string" />
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                            <xs:element name="price" type="xs:decimal" />
                        </xs:sequence>
                        <xs:attribute name="genre" type="xs:string" use="required" />
                        <xs:attribute name="publicationdate" type="xs:date" use="required" />
                        <xs:attribute name="ISBN" type="xs:string" use="required" />
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Kommentarer

Egenskapen ValueType hämtar egenskapen .NET Type för det angivna värdet för den aktuella noden.

Ett element av typen xs:int skulle till exempel ha en ValueType av Int32 som standard. Det kan dock ValueType vara någon av de giltiga typerna som kan mappas till till xs:int exempel Int16 eller Double.

Om en nod inte har någon typ motsvarar detta typanteckningen på noden som är xdt:untypedAtomic. I det här fallet returnerar egenskapen ValueType en sträng för noden. Mer information finns i Typstöd i System.Xml-klasser.