XmlNodeReader.ResolveEntity メソッドとは? わかりやすく解説

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XmlNodeReader.ResolveEntity メソッド

EntityReference ノードエンティティ参照解決します

名前空間: System.Xml
アセンブリ: System.Xml (system.xml.dll 内)
構文構文

Public Overrides Sub ResolveEntity
Dim instance As XmlNodeReader

instance.ResolveEntity
public override void ResolveEntity ()
public:
virtual void ResolveEntity () override
public void ResolveEntity ()
例外例外
例外種類条件

InvalidOperationException

リーダーEntityReference ノード配置されていません。

解説解説
使用例使用例

ResolveEntity使用して一般エンティティ展開する例を次に示します

Option Explicit
Option Strict

Imports System
Imports System.IO
Imports System.Xml

Public Class Sample
    
    Public Shared Sub Main()
        Dim reader As XmlNodeReader = Nothing
        
        Try
            'Create and load an XML document. 
            Dim doc As New
 XmlDocument()
            doc.LoadXml("<!DOCTYPE book [<!ENTITY h 'hardcover'>]>"
 & _
                        "<book>" & _
                        "<title>Pride And Prejudice</title>"
 & _
                        "<misc>&h;</misc>"
 & _
                        "</book>")
            
            'Create the reader.
            reader = New XmlNodeReader(doc)
            
            reader.MoveToContent() 'Move to the root element.
            reader.Read() 'Move to title start tag.
            reader.Skip() 'Skip the title element.
            'Read the misc start tag.  The reader is now positioned
 on
            'the entity reference node.
            reader.ReadStartElement()
            
            'You must call ResolveEntity to expand the entity reference.
            'The entity replacement text is then parsed and returned
 as a child node.
            Console.WriteLine("Expand the entity...")
            reader.ResolveEntity()
            
            Console.WriteLine("The entity replacement text is
 returned as a text node.")
            reader.Read()
            Console.WriteLine("NodeType: {0} Value: {1}",
 reader.NodeType, reader.Value)
            
            Console.WriteLine("An EndEntity node closes the entity
 reference scope.")
            reader.Read()
            Console.WriteLine("NodeType: {0} Name: {1}",
 reader.NodeType, reader.Name)
        
        Finally
            If Not (reader Is
 Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub 'Main
End Class 'Sample 
using System;
using System.IO;
using System.Xml;

public class Sample
{
  public static void Main()
  {
     XmlNodeReader reader = null;

     try
     {
       //Create and load an XML document. 
       XmlDocument doc = new XmlDocument();
       doc.LoadXml("<!DOCTYPE book [<!ENTITY h 'hardcover'>]>"
 +
                   "<book>" +
                   "<title>Pride And Prejudice</title>" +
                   "<misc>&h;</misc>" +
                   "</book>"); 

       //Create the reader.
       reader = new XmlNodeReader(doc);

       reader.MoveToContent();  //Move to the root element.
       reader.Read();  //Move to title start tag.
       reader.Skip();  //Skip the title element.
      
       //Read the misc start tag.  The reader is now positioned on
       //the entity reference node.
       reader.ReadStartElement(); 

       //You must call ResolveEntity to expand the entity reference.
       //The entity replacement text is then parsed and returned as
 a child node.
       Console.WriteLine("Expand the entity...");
       reader.ResolveEntity();  

       Console.WriteLine("The entity replacement text is returned as a text
 node.");
       reader.Read();  
       Console.WriteLine("NodeType: {0} Value: {1}", reader.NodeType ,reader.Value);

       Console.WriteLine("An EndEntity node closes the entity reference scope.");
       reader.Read();
       Console.WriteLine("NodeType: {0} Name: {1}", reader.NodeType,reader.Name);
 
     
    }
    finally
    {
       if (reader != null)
         reader.Close();
    }
  }
}
#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlNodeReader^ reader = nullptr;
   try
   {
      
      //Create and load an XML document. 
      XmlDocument^ doc = gcnew XmlDocument;
      doc->LoadXml( "<!DOCTYPE book [<!ENTITY h 'hardcover'>]>"
      "<book>"
      "<title>Pride And Prejudice</title>"
      "<misc>&h;</misc>"
      "</book>" );
      
      //Create the reader.
      reader = gcnew XmlNodeReader( doc );
      reader->MoveToContent(); //Move to the root element.
      reader->Read(); //Move to title start tag.
      reader->Skip(); //Skip the title element.
      
      //Read the misc start tag.  The reader is now positioned on
      //the entity reference node.
      reader->ReadStartElement();
      
      //You must call ResolveEntity to expand the entity reference.
      //The entity replacement text is then parsed and returned as a
 child node.
      Console::WriteLine( "Expand the entity..." );
      reader->ResolveEntity();
      Console::WriteLine( "The entity replacement text is returned as a text
 node." );
      reader->Read();
      Console::WriteLine( "NodeType: {0} Value: {1}", reader->NodeType,
 reader->Value );
      Console::WriteLine( "An EndEntity node closes the entity reference scope."
 );
      reader->Read();
      Console::WriteLine( "NodeType: {0} Name: {1}", reader->NodeType,
 reader->Name );
   }
   finally
   {
      if ( reader != nullptr )
            reader->Close();
   }

}

import System.*;
import System.IO.*;
import System.Xml.*;

public class Sample
{
    public static void main(String[]
 args)
    {
        XmlNodeReader reader = null;
        try {
            //Create and load an XML document. 
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<!DOCTYPE book [<!ENTITY h 'hardcover'>]>"
                + "<book>"
                + "<title>Pride And Prejudice</title>"
                + "<misc>&h;</misc>"
                + "</book>");

            //Create the reader.
            reader = new XmlNodeReader(doc);

            reader.MoveToContent(); //Move to the root element.
            reader.Read(); //Move to title start tag.
            reader.Skip(); //Skip the title element.

            //Read the misc start tag.  The reader is now positioned
 on
            //the entity reference node.
            reader.ReadStartElement();

            //You must call ResolveEntity to expand the entity reference.
            //The entity replacement text is then parsed 
            //and returned as a child node.
            Console.WriteLine("Expand the entity...");
            reader.ResolveEntity();

            Console.WriteLine("The entity replacement text is returned "
                + "as a text node.");
            reader.Read();
            Console.WriteLine("NodeType: {0} Value: {1}",reader.get_NodeType()
,
                reader.get_Value());

            Console.WriteLine("An EndEntity node closes the "
                + "entity reference scope.");      
            reader.Read();
            Console.WriteLine("NodeType: {0} Name: {1}", reader.get_NodeType(),
 
                reader.get_Name());
        } 
        finally {
            if (reader != null) {
                reader.Close();
            }
        }
    } //main
} //Sample
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