XmlNodeReader.MoveToNextAttribute メソッドとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

XmlNodeReader.MoveToNextAttribute メソッド

次の属性に移動します。

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

Visual Basic (宣言)

Public Overrides Function
 MoveToNextAttribute As Boolean

Visual Basic (使用法)

Dim instance As XmlNodeReader
Dim returnValue As Boolean

returnValue = instance.MoveToNextAttribute

public override bool MoveToNextAttribute ()

C++

public:
virtual bool MoveToNextAttribute () override

public boolean MoveToNextAttribute ()

JScript

public override function MoveToNextAttribute
 () : boolean

戻り値
次の属性が存在する場合は true。それ以上、属性が存在しない場合は false。

解説

メモ
Microsoft .NET Framework version 2.0 では、XmlReaderSettings クラスと Create メソッドを使用して XmlReader インスタンスを作成することをお勧めします。これにより、.NET Framework で導入されたすべての新機能を十分に活用できます。詳細については、「XML リーダーの作成」を参照してください。

現在のノードが属性ノードでない場合、このメソッドは MoveToFirstAttribute と等価になります。MoveToNextAttribute が true を返す場合は、リーダーが次の属性へ移動します。それ以外の場合、リーダーの位置は変更されません。

使用例

書籍を読み取る例を次に示します。

Visual Basic

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 the XML document.
            Dim doc As New
 XmlDocument()
            doc.LoadXml("<book genre='novel' ISBN='1-861003-78'>
 " & _
                       "<title>Pride And Prejudice</title>"
 & _
                       "<price>19.95</price>"
 & _
                       "</book>")
            
            'Load the XmlNodeReader 
            reader = New XmlNodeReader(doc)
            
            'Read the attributes on the book element.
            reader.MoveToContent()
            While reader.MoveToNextAttribute()
                Console.WriteLine("{0} = {1}", reader.Name,
 reader.Value)
            End While
            
            'Move the reader to the title element.
            reader.Read()
            
            'Read the title and price elements.
            Console.WriteLine(reader.ReadElementString())
            Console.WriteLine(reader.ReadElementString())
        
        Finally
            If Not (reader Is
 Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub 'Main ' End class
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 the XML document.
       XmlDocument doc = new XmlDocument();
       doc.LoadXml("<book genre='novel' ISBN='1-861003-78'> " +
                   "<title>Pride And Prejudice</title>" +
                   "<price>19.95</price>" +
                   "</book>"); 

       //Load the XmlNodeReader 
       reader = new XmlNodeReader(doc);
  
       //Read the attributes on the book element.
       reader.MoveToContent();
       while (reader.MoveToNextAttribute())
       {
         Console.WriteLine("{0} = {1}", reader.Name, reader.Value);
       }

       //Move the reader to the title element.
       reader.Read();

       //Read the title and price elements.
       Console.WriteLine(reader.ReadElementString());
       Console.WriteLine(reader.ReadElementString());

     } 

     finally 
     {
        if (reader != null)
          reader.Close();
      }
  }
} // End class

C++

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlNodeReader^ reader = nullptr;
   try
   {
      
      //Create and load the XML document.
      XmlDocument^ doc = gcnew XmlDocument;
      doc->LoadXml( "<book genre='novel' ISBN='1-861003-78'> "
      "<title>Pride And Prejudice</title>"
      "<price>19.95</price>"
      "</book>" );
      
      //Load the XmlNodeReader 
      reader = gcnew XmlNodeReader( doc );
      
      //Read the attributes on the book element.
      reader->MoveToContent();
      while ( reader->MoveToNextAttribute() )
      {
         Console::WriteLine( "{0} = {1}", reader->Name, reader->Value
 );
      }
      
      //Move the reader to the title element.
      reader->Read();
      
      //Read the title and price elements.
      Console::WriteLine( reader->ReadElementString() );
      Console::WriteLine( reader->ReadElementString() );
   }
   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 the XML document.
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<book genre='novel' ISBN='1-861003-78'> "
                + "<title>Pride And Prejudice</title>"
                + "<price>19.95</price>"
                + "</book>");

            //Load the XmlNodeReader 
            reader = new XmlNodeReader(doc);

            //Read the attributes on the book element.
            reader.MoveToContent();
            while (reader.MoveToNextAttribute()) {
                Console.WriteLine("{0} = {1}", reader.get_Name(), 
                    reader.get_Value());
            }

            //Move the reader to the title element.
            reader.Read();

            //Read the title and price elements.
            Console.WriteLine(reader.ReadElementString());
            Console.WriteLine(reader.ReadElementString());
        } 
        finally {
            if (reader != null) {
                reader.Close();
            }
        }
    } //main
} //End class Sample