XPathNavigator.ValueType Properti

Definisi

Ruang nama:

System.Xml.XPath

Rakitan:

netstandard.dll, System.Xml.ReaderWriter.dll

Sumber:

XPathNavigator.cs

Mendapatkan .NET Type dari simpul saat ini.

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

public override Type ValueType { get; }

member this.ValueType : Type

Public Overrides ReadOnly Property ValueType As Type

Nilai Properti

Type

.NET Type dari simpul saat ini. Nilai defaultnya adalah String.

Contoh

Dalam contoh berikut, contosoBooks.xml file XML dan contosoBooks.xsd skema bahasa definisi Skema XML (XSD) digunakan untuk membuat XPathNavigator objek. Nilai elemen yang price ditik ditampilkan menggunakan ValueType properti lalu dikembalikan sebagai string menggunakan ValueAs metode .

// 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)

Contoh mengambil contosoBooks.xml file sebagai 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>

Contohnya juga mengambil contosoBooks.xsd sebagai input.

<?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>

Keterangan

Properti ValueType mendapatkan .NET Type dari nilai yang ditik dari simpul saat ini.

Misalnya, elemen jenis xs:int akan memiliki ValueType dari Int32 secara default. Namun, ValueType bisa jadi salah satu jenis valid yang dapat dipetakan xs:int seperti Int16 atau Double.

Jika node tidak memiliki jenis, ini setara dengan anotasi jenis pada node yang .xdt:untypedAtomic Dalam hal ini, ValueType properti mengembalikan string untuk simpul. Untuk informasi selengkapnya, lihat Ketik Dukungan di Kelas System.Xml.