XmlNode.PrependChild(XmlNode) XmlNode.PrependChild(XmlNode) XmlNode.PrependChild(XmlNode) XmlNode.PrependChild(XmlNode) Method

定義

將指定的節點加入這個節點之子節點清單的開頭。Adds the specified node to the beginning of the list of child nodes for this node.

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

參數

newChild
XmlNode XmlNode XmlNode XmlNode

要加入的節點。The node to add. 要加入之節點的所有內容會移入指定的位置。All the contents of the node to be added are moved into the specified location.

傳回

已加入的節點。The node added.

例外狀況

這個節點的型別不允許 newChild 節點型別的子節點。This node is of a type that does not allow child nodes of the type of the newChild node.

newChild 是這個節點的上階。The newChild is an ancestor of this node.

newChild 由不同於建立這個節點的另一份文件所建立。The newChild was created from a different document than the one that created this node.

這個節點是唯讀的。This node is read-only.

範例

下列範例會將新的節點加入至 XML 檔。The following example adds a new node to the XML document.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlDocument^ doc = gcnew XmlDocument;
   doc->LoadXml( "<book genre='novel' ISBN='1-861001-57-5'>"
   "<title>Pride And Prejudice</title>"
   "</book>" );
   XmlNode^ root = doc->DocumentElement;
   
   //Create a new node.
   XmlElement^ elem = doc->CreateElement( "price" );
   elem->InnerText = "19.95";
   
   //Add the node to the document.
   root->PrependChild( elem );
   Console::WriteLine( "Display the modified XML..." );
   doc->Save( Console::Out );
}

using System;
using System.IO;
using System.Xml;

public class Sample {

  public static void Main() {

    XmlDocument doc = new XmlDocument();
    doc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" +
                "<title>Pride And Prejudice</title>" +
                "</book>");

    XmlNode root = doc.DocumentElement;

    //Create a new node.
    XmlElement elem = doc.CreateElement("price");
    elem.InnerText="19.95";

    //Add the node to the document.
    root.PrependChild(elem);

    Console.WriteLine("Display the modified XML...");
    doc.Save(Console.Out);

  }
}
Option Explicit
Option Strict

Imports System.IO
Imports System.Xml

Public Class Sample
    
    Public Shared Sub Main()
        
        Dim doc As New XmlDocument()
        doc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" & _
                    "<title>Pride And Prejudice</title>" & _
                    "</book>")
        
        Dim root As XmlNode = doc.DocumentElement
        
        'Create a new node.
        Dim elem As XmlElement = doc.CreateElement("price")
        elem.InnerText = "19.95"
        
        'Add the node to the document.
        root.PrependChild(elem)
        
        Console.WriteLine("Display the modified XML...")
        doc.Save(Console.Out)
    End Sub
End Class 'Sample

備註

newChild如果已經在樹狀結構中,它會從其原始位置移除並加入其目標位置。If the newChild is already in the tree, it is removed from its original position and added to its target position. 如需插入節點的詳細資訊,請參閱將節點插入 XML 檔For more information about inserting nodes, see Inserting Nodes into an XML Document.

如果要插入的節點是從另一個檔建立的,您XmlDocument.ImportNode可以使用將節點匯入到目前的檔。If the node being inserted was created from another document, you can use XmlDocument.ImportNode to import the node to the current document. 然後,匯入的節點可以插入目前檔中。The imported node can then be inserted into the current document.

這個方法是檔物件模型(DOM)的 Microsoft 擴充功能。This method is a Microsoft extension to the Document Object Model (DOM).

給繼承者的注意事項

在衍生PrependChild類別中覆寫時,為了讓事件正確引發,您必須PrependChild呼叫基類的方法。When overriding PrependChild in a derived class, in order for events to be raised correctly, you must call the PrependChild method of the base class.

適用於

另請參閱