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XmlAttribute.CloneNode(Boolean) Metoda

Definice

Vytvoří duplikát tohoto uzlu.

public:
 override System::Xml::XmlNode ^ CloneNode(bool deep);
public override System.Xml.XmlNode CloneNode (bool deep);
override this.CloneNode : bool -> System.Xml.XmlNode
Public Overrides Function CloneNode (deep As Boolean) As XmlNode

Parametry

deep
Boolean

true k rekurzivnímu klonování podstromu pod zadaným uzlem; false naklonujte pouze samotný uzel.

Návraty

XmlNode

Duplicitní uzel.

Příklady

Následující příklad používá CloneNode k přidání atributu do dvou různých uzlů elementů.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   
   //Create an XmlDocument.
   XmlDocument^ doc = gcnew XmlDocument;
   doc->Load( "2elems.xml" );
   
   //Create an attribute.
   XmlAttribute^ attr;
   attr = doc->CreateAttribute( "bk", "genre", "urn:samples" );
   attr->Value = "novel";
   
   //Add the attribute to the first book.
   XmlElement^ currNode = dynamic_cast<XmlElement^>(doc->DocumentElement->FirstChild);
   currNode->SetAttributeNode( attr );
   
   //An attribute cannot be added to two different elements.  
   //You must clone the attribute and add it to the second book.
   XmlAttribute^ attr2;
   attr2 = dynamic_cast<XmlAttribute^>(attr->CloneNode( true ));
   currNode = dynamic_cast<XmlElement^>(doc->DocumentElement->LastChild);
   currNode->SetAttributeNode( attr2 );
   Console::WriteLine( "Display the modified XML...\r\n" );
   XmlTextWriter^ writer = gcnew XmlTextWriter( Console::Out );
   writer->Formatting = Formatting::Indented;
   doc->WriteContentTo( writer );
}
using System;
using System.IO;
using System.Xml;

public class Sample
{
  public static void Main()
  {
    //Create an XmlDocument.
    XmlDocument doc = new XmlDocument();
    doc.Load("2elems.xml");

    //Create an attribute.
    XmlAttribute attr;
    attr = doc.CreateAttribute("bk","genre","urn:samples");
    attr.Value = "novel";

    //Add the attribute to the first book.
    XmlElement currNode = (XmlElement) doc.DocumentElement.FirstChild;
    currNode.SetAttributeNode(attr);

    //An attribute cannot be added to two different elements.
    //You must clone the attribute and add it to the second book.
    XmlAttribute attr2;
    attr2 = (XmlAttribute) attr.CloneNode(true);
    currNode = (XmlElement) doc.DocumentElement.LastChild;
    currNode.SetAttributeNode(attr2);

    Console.WriteLine("Display the modified XML...\r\n");
    XmlTextWriter writer = new XmlTextWriter(Console.Out);
    writer.Formatting = Formatting.Indented;
    doc.WriteContentTo(writer);
  }
}
Imports System.IO
Imports System.Xml

public class Sample

  public shared sub Main()

    Dim doc as XmlDocument = new XmlDocument()
    doc.Load("2elems.xml")
 
    'Create an attribute.
    Dim attr as XmlAttribute 
    attr = doc.CreateAttribute("bk","genre","urn:samples")
    attr.Value = "novel"

    'Add the attribute to the first book.
    Dim currNode as XmlElement
    currNode = CType(doc.DocumentElement.FirstChild, XmlElement) 
    currNode.SetAttributeNode(attr)

    'An attribute cannot be added to two different elements.  
    'You must clone the attribute and add it to the second book.
    Dim attr2 as XmlAttribute 
    attr2 = CType (attr.CloneNode(true), XmlAttribute) 
    currNode = CType(doc.DocumentElement.LastChild, XmlElement) 
    currNode.SetAttributeNode(attr2)

    Console.WriteLine("Display the modified XML...")
    Dim writer as XmlTextWriter = new XmlTextWriter(Console.Out)
    writer.Formatting = Formatting.Indented
    doc.WriteContentTo(writer)

  end sub
end class

Příklad používá soubor , 2elems.xmljako vstup.


<!--sample XML fragment-->
<bookstore>
  <book ISBN='10-861003-324'>
    <title>The Handmaid's Tale</title>
    <price>19.95</price>
  </book>
  <book ISBN='1-861001-57-5'>
    <title>Pride And Prejudice</title>
    <price>24.95</price>
  </book>
</bookstore>

Poznámky

Tato metoda slouží jako konstruktor kopírování pro uzly. Klonovaný uzel nemá žádnou nadřazenou položku (ParentNode vrátí null).

Klonování nezadaného atributu vrátí zadaný atribut (Specified vrátí true).

Platí pro

Viz také