XPathNavigator.SetTypedValue(Object) 方法

定义

命名空间:
System.Xml.XPath
程序集:
netstandard.dll, System.Xml.ReaderWriter.dll
程序集:
System.Xml.XPath.dll
程序集:
System.Xml.ReaderWriter.dll
程序集:
System.Xml.dll
程序集:
netstandard.dll
Source:
XPathNavigator.cs
Source:
XPathNavigator.cs
Source:
XPathNavigator.cs
Source:
XPathNavigator.cs
Source:
XPathNavigator.cs

设置当前节点的类型化值。

public:
 virtual void SetTypedValue(System::Object ^ typedValue);
public virtual void SetTypedValue(object typedValue);
abstract member SetTypedValue : obj -> unit
override this.SetTypedValue : obj -> unit
Public Overridable Sub SetTypedValue (typedValue As Object)

参数

typedValue
Object

节点的新类型化值。

例外

ArgumentException

不支持 XPathNavigator 指定对象的类型。

ArgumentNullException

指定的值不能 null为 。

InvalidOperationException

该 XPathNavigator 元素或属性节点上未定位。

NotSupportedException

不支持 XPathNavigator 编辑。

示例

在以下示例中，SetTypedValue该方法用于使用price对象更新文件中的所有contosoBooks.xml元素XmlNamespaceManager，以解析 XPath 表达式中的命名空间前缀。

XmlReaderSettings settings = new XmlReaderSettings();
settings.Schemas.Add("http://www.contoso.com/books", "contosoBooks.xsd");
settings.ValidationType = ValidationType.Schema;

XmlReader reader = XmlReader.Create("contosoBooks.xml", settings);
XmlDocument document = new XmlDocument();
document.Load(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");

Decimal price = 19.99M;
navigator.SetTypedValue(price);

navigator.MoveToParent();
Console.WriteLine(navigator.OuterXml);

Dim settings As XmlReaderSettings = New XmlReaderSettings()
settings.Schemas.Add("http://www.contoso.com/books", "contosoBooks.xsd")
settings.ValidationType = ValidationType.Schema

Dim reader As XmlReader = XmlReader.Create("contosoBooks.xml", settings)
Dim document As XmlDocument = New XmlDocument()
document.Load(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")

Dim price As New Decimal(19.99)
navigator.SetTypedValue(price)

navigator.MoveToParent()
Console.WriteLine(navigator.OuterXml)

该示例将 contosoBooks.xml 文件作为输入。

<?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>

注解

当作为架构验证XmlDocument对象的结果创建对象XmlReader时，针对 XML 文档的 XML 架构定义语言（XSD）架构验证方法SetTypedValue指定的值。 如果指定的值根据 XML 文档的架构无效，则会引发一个 XmlSchemaException 值。

SetTypedValue该方法仅在定位在元素或属性节点上时才XPathNavigator有效。

适用于