XmlWriter.WriteAttributeString メソッドとは? わかりやすく解説

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XmlWriter.WriteAttributeString メソッド (String, String, String, String)

派生クラスオーバーライドされると、指定したプリフィックスローカル名、名前空間 URI、および値の属性書き込みます

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

Public Sub WriteAttributeString ( _
    prefix As String, _
    localName As String, _
    ns As String, _
    value As String _
)
Dim instance As XmlWriter
Dim prefix As String
Dim localName As String
Dim ns As String
Dim value As String

instance.WriteAttributeString(prefix, localName, ns, value)
public void WriteAttributeString (
    string prefix,
    string localName,
    string ns,
    string value
)
public:
void WriteAttributeString (
    String^ prefix, 
    String^ localName, 
    String^ ns, 
    String^ value
)
public void WriteAttributeString (
    String prefix, 
    String localName, 
    String ns, 
    String value
)
public function WriteAttributeString (
    prefix : String, 
    localName : String, 
    ns : String, 
    value : String
)

パラメータ

prefix

属性名前空間プリフィックス

localName

属性ローカル名。

ns

属性名前空間 URI

value

属性の値。

例外例外
例外種類条件

InvalidOperationException

ライタWriteState.Element の状態にないか、またはライタ閉じてます。

ArgumentException

xml:space 属性値または xml:lang 属性値無効です。

解説解説
使用例使用例

WriteAttributeString メソッド使用して名前空間宣言書き込む例を次に示します

Imports System
Imports System.IO
Imports System.Xml

Public Class Sample 

  Public Shared Sub Main()
 
 
     Dim writer As XmlWriter = Nothing

     writer = XmlWriter.Create("sampledata.xml")
        
     ' Write the root element.
     writer.WriteStartElement("book")

     ' Write the xmlns:bk="urn:book" namespace declaration.
     writer.WriteAttributeString("xmlns","bk",
 Nothing,"urn:book")
  
     ' Write the bk:ISBN="1-800-925" attribute.
     writer.WriteAttributeString("ISBN", "urn:book",
 "1-800-925")

     writer.WriteElementString("price", "19.95")

     ' Write the close tag for the root element.
     writer.WriteEndElement()
             
     ' Write the XML to file and close the writer.
     writer.Flush()
     writer.Close()  

  End Sub
End Class
using System;
using System.IO;
using System.Xml;

public class Sample {

  public static void Main()
 {
 
     XmlWriter writer = null;

     writer = XmlWriter.Create("sampledata.xml");
        
     // Write the root element.
     writer.WriteStartElement("book");

     // Write the xmlns:bk="urn:book" namespace declaration.
     writer.WriteAttributeString("xmlns","bk", null
,"urn:book");
  
     // Write the bk:ISBN="1-800-925" attribute.
     writer.WriteAttributeString("ISBN", "urn:book", "1-800-925");

     writer.WriteElementString("price", "19.95");

     // Write the close tag for the root element.
     writer.WriteEndElement();
             
     // Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();  

  }
}
#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
void main()
{
   XmlWriter^ writer = nullptr;
   writer = XmlWriter::Create( L"sampledata.xml" );
   
   // Write the root element.
   writer->WriteStartElement( L"book" );
   
   // Write the xmlns:bk="urn:book" namespace declaration.
   writer->WriteAttributeString( L"xmlns", L"bk", nullptr,
 L"urn:book" );
   
   // Write the bk:ISBN="1-800-925" attribute.
   writer->WriteAttributeString( L"ISBN", L"urn:book", L"1-800-925"
 );
   writer->WriteElementString( L"price", L"19.95" );
   
   // Write the close tag for the root element.
   writer->WriteEndElement();
   
   // Write the XML to file and close the writer.
   writer->Flush();
   writer->Close();
}
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参照参照

XmlWriter.WriteAttributeString メソッド

XmlWriter による XML書き方

XmlWriter.WriteAttributeString メソッド (String, String, String)

派生クラスオーバーライドされると、指定したローカル名、名前空間 URI、および値の属性書き込みます

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

Public Sub WriteAttributeString ( _
    localName As String, _
    ns As String, _
    value As String _
)
Dim instance As XmlWriter
Dim localName As String
Dim ns As String
Dim value As String

instance.WriteAttributeString(localName, ns, value)
public void WriteAttributeString (
    string localName,
    string ns,
    string value
)
public:
void WriteAttributeString (
    String^ localName, 
    String^ ns, 
    String^ value
)
public void WriteAttributeString (
    String localName, 
    String ns, 
    String value
)
public function WriteAttributeString (
    localName : String, 
    ns : String, 
    value : String
)

パラメータ

localName

属性ローカル名。

ns

属性関連付ける名前空間 URI

value

属性の値。

例外例外
例外種類条件

InvalidOperationException

ライタWriteState.Element の状態にないか、またはライタ閉じてます。

ArgumentException

xml:space 属性値または xml:lang 属性値無効です。

解説解説

このメソッドは、ユーザー定義の名前空間プリフィックスを持つ属性書き込み指定した名前空間関連付けます。localName が "xmlns" の場合、このメソッドはこれも名前空間宣言として扱います。この場合ns 引数null 参照 (Visual Basic では Nothing) でもかまいません

WriteAttributeString次の処理を実行します

使用例使用例

WriteAttributeString メソッド使用して名前空間宣言書き込む例を次に示します

Imports System
Imports System.IO
Imports System.Xml

Public Class Sample 

  Public Shared Sub Main()
 
 
     Dim writer As XmlWriter = Nothing

     writer = XmlWriter.Create("sampledata.xml")
        
     ' Write the root element.
     writer.WriteStartElement("book")

     ' Write the xmlns:bk="urn:book" namespace declaration.
     writer.WriteAttributeString("xmlns","bk",
 Nothing,"urn:book")
  
     ' Write the bk:ISBN="1-800-925" attribute.
     writer.WriteAttributeString("ISBN", "urn:book",
 "1-800-925")

     writer.WriteElementString("price", "19.95")

     ' Write the close tag for the root element.
     writer.WriteEndElement()
             
     ' Write the XML to file and close the writer.
     writer.Flush()
     writer.Close()  

  End Sub
End Class
using System;
using System.IO;
using System.Xml;

public class Sample {

  public static void Main()
 {
 
     XmlWriter writer = null;

     writer = XmlWriter.Create("sampledata.xml");
        
     // Write the root element.
     writer.WriteStartElement("book");

     // Write the xmlns:bk="urn:book" namespace declaration.
     writer.WriteAttributeString("xmlns","bk", null
,"urn:book");
  
     // Write the bk:ISBN="1-800-925" attribute.
     writer.WriteAttributeString("ISBN", "urn:book", "1-800-925");

     writer.WriteElementString("price", "19.95");

     // Write the close tag for the root element.
     writer.WriteEndElement();
             
     // Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();  

  }
}
#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
void main()
{
   XmlWriter^ writer = nullptr;
   writer = XmlWriter::Create( L"sampledata.xml" );
   
   // Write the root element.
   writer->WriteStartElement( L"book" );
   
   // Write the xmlns:bk="urn:book" namespace declaration.
   writer->WriteAttributeString( L"xmlns", L"bk", nullptr,
 L"urn:book" );
   
   // Write the bk:ISBN="1-800-925" attribute.
   writer->WriteAttributeString( L"ISBN", L"urn:book", L"1-800-925"
 );
   writer->WriteElementString( L"price", L"19.95" );
   
   // Write the close tag for the root element.
   writer->WriteEndElement();
   
   // Write the XML to file and close the writer.
   writer->Flush();
   writer->Close();
}
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照

XmlWriter.WriteAttributeString メソッド (String, String)

派生クラスオーバーライドされると、指定したローカル名と値の属性書き込みます

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

Public Sub WriteAttributeString ( _
    localName As String, _
    value As String _
)
Dim instance As XmlWriter
Dim localName As String
Dim value As String

instance.WriteAttributeString(localName, value)
public void WriteAttributeString (
    string localName,
    string value
)
public:
void WriteAttributeString (
    String^ localName, 
    String^ value
)
public void WriteAttributeString (
    String localName, 
    String value
)
public function WriteAttributeString (
    localName : String, 
    value : String
)

パラメータ

localName

属性ローカル名。

value

属性の値。

例外例外
例外種類条件

InvalidOperationException

ライタWriteState.Element の状態にないか、またはライタ閉じてます。

ArgumentException

xml:space 属性値または xml:lang 属性値無効です。

解説解説

WriteAttributeString次の処理を実行します

使用例使用例

book書き込む例を次に示します

Option Strict
Option Explicit

Imports System
Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared m_Document As
 String = "sampledata.xml"
    
    Public Shared Sub Main()
        Dim writer As XmlWriter = Nothing
        
      Try

        Dim settings As XmlWriterSettings =
 new XmlWriterSettings()
        settings.Indent = true
        writer = XmlWriter.Create (m_Document)
            
        writer.WriteComment("sample XML fragment")
            
        ' Write an element (this one is the root).
        writer.WriteStartElement("book")
            
        ' Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk",
 Nothing, "urn:samples")
            
        ' Write the genre attribute.
        writer.WriteAttributeString("genre", "novel")
            
        ' Write the title.
        writer.WriteStartElement("title")
        writer.WriteString("The Handmaid's Tale")
        writer.WriteEndElement()
            
        ' Write the price.
        writer.WriteElementString("price", "19.95")
            
        ' Lookup the prefix and write the ISBN element.
        Dim prefix As String
 = writer.LookupPrefix("urn:samples")
        writer.WriteStartElement(prefix, "ISBN", "urn:samples")
        writer.WriteString("1-861003-78")
        writer.WriteEndElement()
            
        ' Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples",
 "hardcover")
            
        ' Write the close tag for the root element.
        writer.WriteEndElement()
            
        ' Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        Finally
            If Not (writer Is
 Nothing) Then
                writer.Close()
            End If
        End Try

    End Sub 'Main 
End Class 'Sample
using System;
using System.IO;
using System.Xml;
 
 public class Sample
 {
   private const string
 m_Document = "sampledata.xml";
 
   public static void Main()
 {
   
      XmlWriter writer = null;

      try {
     
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        writer = XmlWriter.Create (m_Document);
           
        writer.WriteComment("sample XML fragment");
     
        // Write an element (this one is the root).
        writer.WriteStartElement("book");
 
        // Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", null,
 "urn:samples");
    
        // Write the genre attribute.
        writer.WriteAttributeString("genre", "novel");
         
        // Write the title.
        writer.WriteStartElement("title");
        writer.WriteString("The Handmaid's Tale");
        writer.WriteEndElement();
               
        // Write the price.
        writer.WriteElementString("price", "19.95");
      
        // Lookup the prefix and write the ISBN element.
        string prefix = writer.LookupPrefix("urn:samples");
        writer.WriteStartElement(prefix, "ISBN", "urn:samples");
        writer.WriteString("1-861003-78");
        writer.WriteEndElement();

        // Write the style element (shows a different way to handle
 prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover");
 
        // Write the close tag for the root element.
        writer.WriteEndElement();
               
        // Write the XML to file and close the writer.
        writer.Flush();
        writer.Close();
      }

      finally {
        if (writer != null)
           writer.Close();
     } 
   }
 
 }
#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
public ref class Sample
{
private:
   static String^ m_Document = L"sampledata.xml";

public:
   static void Main()
   {
      XmlWriter^ writer = nullptr;
      try
      {
         XmlWriterSettings^ settings = gcnew XmlWriterSettings;
         settings->Indent = true;
         writer = XmlWriter::Create( m_Document );
         writer->WriteComment( L"sample XML fragment" );
         
         // Write an element (this one is the root).
         writer->WriteStartElement( L"book" );
         
         // Write the namespace declaration.
         writer->WriteAttributeString( L"xmlns", L"bk", nullptr,
 L"urn:samples" );
         
         // Write the genre attribute.
         writer->WriteAttributeString( L"genre", L"novel"
 );
         
         // Write the title.
         writer->WriteStartElement( L"title" );
         writer->WriteString( L"The Handmaid's Tale" );
         writer->WriteEndElement();
         
         // Write the price.
         writer->WriteElementString( L"price", L"19.95" );
         
         // Lookup the prefix and write the ISBN element.
         String^ prefix = writer->LookupPrefix( L"urn:samples" );
         writer->WriteStartElement( prefix, L"ISBN", L"urn:samples"
 );
         writer->WriteString( L"1-861003-78" );
         writer->WriteEndElement();
         
         // Write the style element (shows a different way to handle
 prefixes).
         writer->WriteElementString( L"style", L"urn:samples",
 L"hardcover" );
         
         // Write the close tag for the root element.
         writer->WriteEndElement();
         
         // Write the XML to file and close the writer.
         writer->Flush();
         writer->Close();
      }
      finally
      {
         if ( writer != nullptr )
                  writer->Close();
      }

   }

};

void main()
{
   Sample::Main();
}

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