XPathNavigator.PrependChild 方法

定义

在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node.

重载

PrependChild()

返回一个 XmlWriter 对象,该对象用于在当前节点的子节点列表的开始处创建一个新的子节点。Returns an XmlWriter object used to create a new child node at the beginning of the list of child nodes of the current node.

PrependChild(String)

使用指定的 XML 字符串在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node using the XML string specified.

PrependChild(XmlReader)

使用指定的 XmlReader 对象的 XML 内容,在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node using the XML contents of the XmlReader object specified.

PrependChild(XPathNavigator)

使用指定的 XPathNavigator 对象中的节点在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node using the nodes in the XPathNavigator object specified.

PrependChild()

返回一个 XmlWriter 对象,该对象用于在当前节点的子节点列表的开始处创建一个新的子节点。Returns an XmlWriter object used to create a new child node at the beginning of the list of child nodes of the current node.

public:
 virtual System::Xml::XmlWriter ^ PrependChild();
public virtual System.Xml.XmlWriter PrependChild ();
abstract member PrependChild : unit -> System.Xml.XmlWriter
override this.PrependChild : unit -> System.Xml.XmlWriter
Public Overridable Function PrependChild () As XmlWriter

返回

XmlWriter

一个 XmlWriter 对象,该对象用于在当前节点的子节点列表的开始处创建一个新的子节点。An XmlWriter object used to create a new child node at the beginning of the list of child nodes of the current node.

例外

放置 XPathNavigator 的当前节点不允许预置新的子节点。The current node the XPathNavigator is positioned on does not allow a new child node to be prepended.

XPathNavigator 不支持编辑。The XPathNavigator does not support editing.

示例

在下面的示例中, pages book contosoBooks.xml 使用 XmlWriter 从方法返回的对象将新的子元素预置到文件中第一个元素的子元素列表的开头 PrependChildIn the following example, a new pages child element is prepended to the beginning of the list of child elements of the first book element in the contosoBooks.xml file using the XmlWriter object returned from the PrependChild method.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");

XmlWriter^ pages = navigator->PrependChild();
pages->WriteElementString("pages", "100");
pages->Close();

Console::WriteLine(navigator->OuterXml);
XmlDocument document = new XmlDocument();
document.Load("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");

XmlWriter pages = navigator.PrependChild();
pages.WriteElementString("pages", "100");
pages.Close();

Console.WriteLine(navigator.OuterXml);
Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")

Dim pages As XmlWriter = navigator.PrependChild()
pages.WriteElementString("pages", "100")
pages.Close()

Console.WriteLine(navigator.OuterXml)

该示例使用 contosoBooks.xml 文件作为输入。The example takes the contosoBooks.xml file as an 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>  

注解

预先计算子节点会将新节点添加到当前节点的子节点列表的开头。Prepending a child node adds the new node to the beginning of the list of child nodes for the current node. 例如,如果有三个子节点用于某个元素,则预置节点将成为第一个子节点。For example, when three child nodes exist for an element, the prepended node becomes the first child node. 如果不存在子节点,则创建一个新的子节点。If no child nodes exist, then a new child node is created.

以下是使用方法时要考虑的重要注意事项 PrependChildThe following are important notes to consider when using the PrependChild method.

适用于

PrependChild(String)

使用指定的 XML 字符串在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node using the XML string specified.

public:
 virtual void PrependChild(System::String ^ newChild);
public virtual void PrependChild (string newChild);
abstract member PrependChild : string -> unit
override this.PrependChild : string -> unit
Public Overridable Sub PrependChild (newChild As String)

参数

newChild
String

新的子节点的 XML 数据字符串。The XML data string for the new child node.

例外

XML 字符串参数是 nullThe XML string parameter is null.

XPathNavigator 所在的当前节点不允许预置新的子节点。The current node the XPathNavigator is positioned on does not allow a new child node to be prepended.

XPathNavigator 不支持编辑。The XPathNavigator does not support editing.

XML 字符串参数的格式不正确。The XML string parameter is not well-formed.

示例

在下面的示例中,将一个新的 pages 子元素预置到文件中第一个元素的子元素列表的开头 book contosoBooks.xmlIn the following example, a new pages child element is prepended to the beginning of the list of child elements of the first book element in the contosoBooks.xml file.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");

navigator->PrependChild("<pages>100</pages>");

Console::WriteLine(navigator->OuterXml);
XmlDocument document = new XmlDocument();
document.Load("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");

navigator.PrependChild("<pages>100</pages>");

Console.WriteLine(navigator.OuterXml);
Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")

navigator.PrependChild("<pages>100</pages>")

Console.WriteLine(navigator.OuterXml)

该示例使用 contosoBooks.xml 文件作为输入。The example takes the contosoBooks.xml file as an 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>  

注解

预先计算子节点会将新节点添加到当前节点的子节点列表的开头。Prepending a child node adds the new node to the beginning of the list of child nodes for the current node. 例如,如果有三个子节点用于某个元素,则预置节点将成为第一个子节点。For example, when three child nodes exist for an element, the prepended node becomes the first child node. 如果不存在子节点,则创建一个新的子节点。If no child nodes exist, then a new child node is created.

若要创建新的元素节点,请在 XML 字符串参数中包含所有 XML 语法。To create a new element node, include all XML syntax in the XML string parameter. 新节点的字符串 bookPrependChild("<book/>")The string for a new book node is PrependChild("<book/>"). 用于在当前节点的文本节点后面追加文本 "book" 的字符串为 PrependChild("book")The string for appending the text "book" to the current node's text node is PrependChild("book"). 如果 XML 字符串包含多个节点,则添加所有节点。If the XML string contains multiple nodes, all nodes are added.

以下是使用方法时要考虑的重要注意事项 PrependChildThe following are important notes to consider when using the PrependChild method.

适用于

PrependChild(XmlReader)

使用指定的 XmlReader 对象的 XML 内容,在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node using the XML contents of the XmlReader object specified.

public:
 virtual void PrependChild(System::Xml::XmlReader ^ newChild);
public virtual void PrependChild (System.Xml.XmlReader newChild);
abstract member PrependChild : System.Xml.XmlReader -> unit
override this.PrependChild : System.Xml.XmlReader -> unit
Public Overridable Sub PrependChild (newChild As XmlReader)

参数

newChild
XmlReader

一个定位在新的子节点的 XML 数据上的 XmlReader 对象。An XmlReader object positioned on the XML data for the new child node.

例外

XmlReader 对象处于错误状态或者已关闭。The XmlReader object is in an error state or closed.

XmlReader 对象参数是 nullThe XmlReader object parameter is null.

XPathNavigator 所在的当前节点不允许预置新的子节点。The current node the XPathNavigator is positioned on does not allow a new child node to be prepended.

XPathNavigator 不支持编辑。The XPathNavigator does not support editing.

XmlReader 对象参数的 XML 内容格式不正确。The XML contents of the XmlReader object parameter is not well-formed.

示例

在下面的示例中, pages book contosoBooks.xml 使用指定的对象将新的子元素预置到文件中第一个元素的子元素列表的开头 XmlReaderIn the following example, a new pages child element is prepended to the beginning of the list of child elements of the first book element in the contosoBooks.xml file using the XmlReader object specified. http://www.contoso.com/books指定命名空间,以便使用与 XML 文档相同的命名空间预置新的子元素。The http://www.contoso.com/books namespace is specified so that the new child element is prepended using the same namespace as the XML document.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");

XmlReader^ pages = XmlReader::Create(gcnew StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));

navigator->PrependChild(pages);

Console::WriteLine(navigator->OuterXml);
XmlDocument document = new XmlDocument();
document.Load("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");

XmlReader pages = XmlReader.Create(new StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));

navigator.PrependChild(pages);

Console.WriteLine(navigator.OuterXml);
Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")

Dim pages As XmlReader = XmlReader.Create(New StringReader("<pages xmlns='http://www.contoso.com/books'>100</pages>"))

navigator.PrependChild(pages)

Console.WriteLine(navigator.OuterXml)

该示例使用 contosoBooks.xml 文件作为输入。The example takes the contosoBooks.xml file as an 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>  

注解

预先计算子节点会将新节点添加到当前节点的子节点列表的开头。Prepending a child node adds the new node to the beginning of the list of child nodes for the current node. 例如,如果有三个子节点用于某个元素,则预置节点将成为第一个子节点。For example, when three child nodes exist for an element, the prepended node becomes the first child node. 如果不存在子节点,则创建一个新的子节点。If no child nodes exist, then a new child node is created.

以下是使用方法时要考虑的重要注意事项 PrependChildThe following are important notes to consider when using the PrependChild method.

适用于

PrependChild(XPathNavigator)

使用指定的 XPathNavigator 对象中的节点在当前节点的子节点列表的开始处创建一个新的子节点。Creates a new child node at the beginning of the list of child nodes of the current node using the nodes in the XPathNavigator object specified.

public:
 virtual void PrependChild(System::Xml::XPath::XPathNavigator ^ newChild);
public virtual void PrependChild (System.Xml.XPath.XPathNavigator newChild);
abstract member PrependChild : System.Xml.XPath.XPathNavigator -> unit
override this.PrependChild : System.Xml.XPath.XPathNavigator -> unit
Public Overridable Sub PrependChild (newChild As XPathNavigator)

参数

newChild
XPathNavigator

一个 XPathNavigator 对象,该对象定位在将作为新的子节点添加的节点上。An XPathNavigator object positioned on the node to add as the new child node.

例外

XPathNavigator 对象参数是 nullThe XPathNavigator object parameter is null.

XPathNavigator 所在的当前节点不允许预置新的子节点。The current node the XPathNavigator is positioned on does not allow a new child node to be prepended.

XPathNavigator 不支持编辑。The XPathNavigator does not support editing.

示例

在下面的示例中,使用指定的对象中包含的节点将新的 pages 子元素预置到文件中第一个元素的子元素列表的开头 book contosoBooks.xml XPathNavigatorIn the following example, a new pages child element is prepended to the beginning of the list of child elements of the first book element in the contosoBooks.xml file using the node contained in the XPathNavigator object specified. http://www.contoso.com/books指定命名空间,以便使用与 XML 文档相同的命名空间预置新的子元素。The http://www.contoso.com/books namespace is specified so that the new child element is prepended using the same namespace as the XML document.

XmlDocument^ document = gcnew XmlDocument();
document->Load("contosoBooks.xml");
XPathNavigator^ navigator = document->CreateNavigator();

navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
navigator->MoveToChild("book", "http://www.contoso.com/books");

XmlDocument^ childNodes = gcnew XmlDocument();
childNodes->Load(gcnew StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));
XPathNavigator^ childNodesNavigator = childNodes->CreateNavigator();

navigator->PrependChild(childNodesNavigator);

Console::WriteLine(navigator->OuterXml);
XmlDocument document = new XmlDocument();
document.Load("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");

XmlDocument childNodes = new XmlDocument();
childNodes.Load(new StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));
XPathNavigator childNodesNavigator = childNodes.CreateNavigator();

navigator.PrependChild(childNodesNavigator);

Console.WriteLine(navigator.OuterXml);
Dim document As XmlDocument = New XmlDocument()
document.Load("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")

Dim childNodes As XmlDocument = New XmlDocument()
childNodes.Load(New StringReader("<pages xmlns='http://www.contoso.com/books'>100</pages>"))
Dim childNodesNavigator As XPathNavigator = childNodes.CreateNavigator()

navigator.PrependChild(childNodesNavigator)

Console.WriteLine(navigator.OuterXml)

该示例使用 contosoBooks.xml 文件作为输入。The example takes the contosoBooks.xml file as an 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>  

注解

预先计算子节点会将新节点添加到当前节点的子节点列表的开头。Prepending a child node adds the new node to the beginning of the list of child nodes for the current node. 例如,如果有三个子节点用于某个元素,则预置节点将成为第一个子节点。For example, when three child nodes exist for an element, the prepended node becomes the first child node. 如果不存在子节点,则创建一个新的子节点。If no child nodes exist, then a new child node is created.

以下是使用方法时要考虑的重要注意事项 PrependChildThe following are important notes to consider when using the PrependChild method.

适用于