XPathNavigator.SetTypedValue(Object) 方法

定义

命名空间:

System.Xml.XPath

程序集:

System.Xml.ReaderWriter.dll

程序集:

System.Xml.XPath.dll

程序集:

System.Xml.dll

程序集:

netstandard.dll

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

节点的新类型值。

例外

ArgumentException

XPathNavigator 不支持指定对象的类型。

ArgumentNullException

指定值不可以为 null。

InvalidOperationException

XPathNavigator 未定位在元素或特性节点上。

NotSupportedException

XPathNavigator 不支持编辑。

示例

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

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

XmlReader^ reader = XmlReader::Create("contosoBooks.xml", settings);
XmlDocument^ document = gcnew 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 = gcnew Decimal(19.99);
navigator->SetTypedValue(price);

navigator->MoveToParent();
Console::WriteLine(navigator->OuterXml);

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)

该示例使用 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

XmlDocument当对象作为架构验证XmlReader对象的结果创建时，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 。

SetTypedValue该方法仅在位于元素或属性节点上时XPathNavigator有效。