XmlNodeReader.Read メソッド

定義

ストリームから次のノードを読み取ります。Reads the next node from the stream.

public:
 override bool Read();
public override bool Read ();
override this.Read : unit -> bool
Public Overrides Function Read () As Boolean

戻り値

Boolean

次のノードが正常に読み取られた場合は true。それ以上読み取る対象となるノードが存在しない場合は falsetrue if the next node was read successfully; false if there are no more nodes to read.

次の例では、XML を読み取り、各ノードを表示します。The following example reads an XML and displays each node.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   String^ filename = "items.xml";
   XmlNodeReader^ reader = nullptr;
   try
   {
      
      //Create an XmlNodeReader to read the XmlDocument.
      XmlDocument^ doc = gcnew XmlDocument;
      doc->Load( filename );
      reader = gcnew XmlNodeReader( doc );
      
      //Parse the file and display each of the nodes.
      while ( reader->Read() )
      {
         switch ( reader->NodeType )
         {
            case XmlNodeType::Element:
               Console::Write( "<{0}>", reader->Name );
               break;

            case XmlNodeType::Text:
               Console::Write( reader->Value );
               break;

            case XmlNodeType::CDATA:
               Console::Write( reader->Value );
               break;

            case XmlNodeType::ProcessingInstruction:
               Console::Write( "<?{0} {1}?>", reader->Name, reader->Value );
               break;

            case XmlNodeType::Comment:
               Console::Write( "<!--{0}-->", reader->Value );
               break;

            case XmlNodeType::XmlDeclaration:
               Console::Write( "<?xml version='1.0'?>" );
               break;

            case XmlNodeType::Document:
               break;

            case XmlNodeType::EndElement:
               Console::Write( "</{0}>", reader->Name );
               break;
         }
      }
   }
   finally
   {
      if ( reader != nullptr )
            reader->Close();
   }

}

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

public class Sample
{
  private const String filename = "items.xml";

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

    try
    {
        //Create an XmlNodeReader to read the XmlDocument.
        XmlDocument doc = new XmlDocument();
        doc.Load(filename);
        reader = new XmlNodeReader(doc);

        //Parse the file and display each of the nodes.
        while (reader.Read())
        {
           switch (reader.NodeType)
           {
             case XmlNodeType.Element:
               Console.Write("<{0}>", reader.Name);
               break;
             case XmlNodeType.Text:
               Console.Write(reader.Value);
               break;
             case XmlNodeType.CDATA:
               Console.Write(reader.Value);
               break;
             case XmlNodeType.ProcessingInstruction:
               Console.Write("<?{0} {1}?>", reader.Name, reader.Value);
               break;
             case XmlNodeType.Comment:
               Console.Write("<!--{0}-->", reader.Value);
               break;
             case XmlNodeType.XmlDeclaration:
               Console.Write("<?xml version='1.0'?>");
               break;
             case XmlNodeType.Document:
               break;
             case XmlNodeType.EndElement:
               Console.Write("</{0}>", reader.Name);
               break;
           }
          }
        }

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

Public Class Sample
    Private Const filename As String = "items.xml"
    Public Shared Sub Main()
        Dim reader As XmlNodeReader = Nothing
        Try
            'Create an XmlNodeReader to read the XmlDocument.
            Dim doc As New XmlDocument()
            doc.Load(filename)
            reader = New XmlNodeReader(doc)
            
            'Parse the file and display each of the nodes.
            While reader.Read()
                Select Case reader.NodeType
                    Case XmlNodeType.Element
                        Console.Write("<{0}>", reader.Name)
                    Case XmlNodeType.Text
                        Console.Write(reader.Value)
                    Case XmlNodeType.CDATA
                        Console.Write(reader.Value)
                    Case XmlNodeType.ProcessingInstruction
                        Console.Write("<?{0} {1}?>", reader.Name, reader.Value)
                    Case XmlNodeType.Comment
                        Console.Write("<!--{0}-->", reader.Value)
                    Case XmlNodeType.XmlDeclaration
                        Console.Write("<?xml version='1.0'?>")
                    Case XmlNodeType.Document
                    Case XmlNodeType.EndElement
                        Console.Write("</{0}>", reader.Name)
                End Select
            End While
        
        Finally
            If Not (reader Is Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub
End Class

この例では、ファイルを items.xml 入力として使用します。The example uses the file, items.xml, as input.


<?xml version="1.0"?>
<!-- This is a sample XML document -->
<!DOCTYPE Items [<!ENTITY number "123">]>
<Items>
  <Item>Test with an entity: &number;</Item>
  <Item>test with a child element <more/> stuff</Item>
  <Item>test with a CDATA section <![CDATA[<456>]]> def</Item>
  <Item>Test with a char entity: &#65;</Item>
  <!-- Fourteen chars in this element.-->
  <Item>1234567890ABCD</Item>
</Items>

注釈

注意

.NET Framework 2.0 では、 XmlReader クラスとメソッドを使用してインスタンスを作成することをお勧めし XmlReaderSettings Create ます。In the .NET Framework 2.0, the recommended practice is to create XmlReader instances using the XmlReaderSettings class and the Create method. これにより、.NET Framework で導入されたすべての新機能を最大限に活用することができます。This allows you to take full advantage of all the new features introduced in the .NET Framework. 詳細については、リファレンスページの「解説」を参照してください XmlReaderFor more information, see the Remarks section in the XmlReader reference page.

リーダーが最初に作成されて初期化されるときに、利用可能な情報はありません。When a reader is first created and initialized, there is no information available. Read最初のノードを読み取るには、を呼び出す必要があります。You must call Read to read the first node.

適用対象