XPathNavigator.SetTypedValue(Object) 方法

定義

命名空間:

System.Xml.XPath

組件:

netstandard.dll, System.Xml.ReaderWriter.dll

來源:

XPathNavigator.cs

設定目前節點的型別值。

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)

參數

typedValue

Object

節點的新型別值。

例外狀況

ArgumentException

不 XPathNavigator 支援指定的物件類型。

ArgumentNullException

指定的值不能是 null。

InvalidOperationException

該 XPathNavigator 節點並未被定位在元素或屬性節點上。

NotSupportedException

它 XPathNavigator 不支援編輯。

範例

在以下範例中，該SetTypedValue方法用於更新檔案中price所有contosoBooks.xml元素，利用XmlNamespaceManager物件解析 XPath 表達式中的命名空間前綴。

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)

此範例會將 contosoBooks.xml 檔案當作輸入。

<?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>

備註

當 XmlDocument 物件作為結構驗證 XmlReader 物件的結果建立時，該方法指定的 SetTypedValue 值會與該 XML 文件的 XML 架構定義語言（XSD）架構進行驗證。 若指定的值依據 XML 文件的結構無效，則會拋出 an XmlSchemaException 。

此 SetTypedValue 方法僅在 被 XPathNavigator 定位於元素或屬性節點時有效。