XmlTextWriter.WriteDocType メソッドとは? わかりやすく解説

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XmlTextWriter.WriteDocType メソッド

名前とオプション属性指定してDOCTYPE 宣言書き込みます

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

Public Overrides Sub WriteDocType
 ( _
    name As String, _
    pubid As String, _
    sysid As String, _
    subset As String _
)
Dim instance As XmlTextWriter
Dim name As String
Dim pubid As String
Dim sysid As String
Dim subset As String

instance.WriteDocType(name, pubid, sysid, subset)
public override void WriteDocType (
    string name,
    string pubid,
    string sysid,
    string subset
)
public:
virtual void WriteDocType (
    String^ name, 
    String^ pubid, 
    String^ sysid, 
    String^ subset
) override
public void WriteDocType (
    String name, 
    String pubid, 
    String sysid, 
    String subset
)
public override function WriteDocType (
    name : String, 
    pubid : String, 
    sysid : String, 
    subset : String
)

パラメータ

name

DOCTYPE の名前。これを空にすることはできません。

pubid

nullない場合は、PUBLIC "pubid" "sysid" も書き込みますpubidsysid は、指定した引数の値に置き換えられます。

sysid

pubidnullsysid が非 null場合は、sysid がこの引数の値に置き換えられる SYSTEM "sysid" を書き込みます

subset

null場合は、subset引数の値で置き換えられる [subset] を書き込みます

例外例外
例外種類条件

InvalidOperationException

このメソッドが、プロローグの外 (ルート要素の後)呼び出されました。

ArgumentException

namenull 参照 (Visual Basic では Nothing) または String.Empty です。

または

name の値が、無効な XML になることがあります

解説解説
使用例使用例

book を表す XML ファイル書き込む例を次に示します

Option Explicit
Option Strict

Imports System
Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared filename As
 String = "sampledata.xml"
    Public Shared Sub Main()
        Dim writer As XmlTextWriter = Nothing
        
        writer = New XmlTextWriter(filename, Nothing)
        'Use indenting for readability.
        writer.Formatting = Formatting.Indented
        
        'Write the XML delcaration. 
        writer.WriteStartDocument()
        
        'Write the ProcessingInstruction node.
        Dim PItext As String
 = "type='text/xsl' href='book.xsl'"
        writer.WriteProcessingInstruction("xml-stylesheet",
 PItext)
        
        'Write the DocumentType node.
        writer.WriteDocType("book", Nothing,
 Nothing, "<!ENTITY h 'hardcover'>")
        
        'Write a Comment node.
        writer.WriteComment("sample XML")
        
        'Write a root element.
        writer.WriteStartElement("book")
        
        'Write the genre attribute.
        writer.WriteAttributeString("genre", "novel")
        
        'Write the ISBN attribute.
        writer.WriteAttributeString("ISBN", "1-8630-014")
        
        'Write the title.
        writer.WriteElementString("title", "The
 Handmaid's Tale")
        
        'Write the style element.
        writer.WriteStartElement("style")
        writer.WriteEntityRef("h")
        writer.WriteEndElement()
        
        'Write the price.
        writer.WriteElementString("price", "19.95")
        
        'Write CDATA.
        writer.WriteCData("Prices 15% off!!")
        
        'Write the close tag for the root element.
        writer.WriteEndElement()
        
        writer.WriteEndDocument()
        
        'Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        'Load the file into an XmlDocument to ensure well formed XML.
        Dim doc As New XmlDocument()
        'Preserve white space for readability.
        doc.PreserveWhitespace = True
        'Load the file.
        doc.Load(filename)
        
        'Display the XML content to the console.
        Console.Write(doc.InnerXml)
    End Sub 'Main 
End Class 'Sample
using System;
using System.IO;
using System.Xml;

public class Sample
{
  private const string filename
 = "sampledata.xml";

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

     writer = new XmlTextWriter (filename, null);
     //Use indenting for readability.
     writer.Formatting = Formatting.Indented;

     //Write the XML delcaration. 
     writer.WriteStartDocument();

     //Write the ProcessingInstruction node.
     String PItext="type='text/xsl' href='book.xsl'";
     writer.WriteProcessingInstruction("xml-stylesheet", PItext);

     //Write the DocumentType node.
     writer.WriteDocType("book", null , null,
 "<!ENTITY h 'hardcover'>");
        
     //Write a Comment node.
     writer.WriteComment("sample XML");
    
     //Write a root element.
     writer.WriteStartElement("book");

     //Write the genre attribute.
     writer.WriteAttributeString("genre", "novel");
    
     //Write the ISBN attribute.
     writer.WriteAttributeString("ISBN", "1-8630-014");

     //Write the title.
     writer.WriteElementString("title", "The Handmaid's Tale");
              
     //Write the style element.
     writer.WriteStartElement("style");
     writer.WriteEntityRef("h");
     writer.WriteEndElement(); 

     //Write the price.
     writer.WriteElementString("price", "19.95");

     //Write CDATA.
     writer.WriteCData("Prices 15% off!!");

     //Write the close tag for the root element.
     writer.WriteEndElement();
             
     writer.WriteEndDocument();

     //Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();  

     //Load the file into an XmlDocument to ensure well formed XML.
     XmlDocument doc = new XmlDocument();
     //Preserve white space for readability.
     doc.PreserveWhitespace = true;
     //Load the file.
     doc.Load(filename);  
    
     //Display the XML content to the console.
     Console.Write(doc.InnerXml);  

  }

}
#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlTextWriter^ writer = nullptr;
   String^ filename = "sampledata.xml";
   writer = gcnew XmlTextWriter( filename, nullptr );
   
   //Use indenting for readability.
   writer->Formatting = Formatting::Indented;
   
   //Write the XML delcaration. 
   writer->WriteStartDocument();
   
   //Write the ProcessingInstruction node.
   String^ PItext = "type='text/xsl' href='book.xsl'";
   writer->WriteProcessingInstruction( "xml-stylesheet", PItext );
   
   //Write the DocumentType node.
   writer->WriteDocType( "book", nullptr, nullptr, "<!ENTITY
 h 'hardcover'>" );
   
   //Write a Comment node.
   writer->WriteComment( "sample XML" );
   
   //Write a root element.
   writer->WriteStartElement( "book" );
   
   //Write the genre attribute.
   writer->WriteAttributeString( "genre", "novel" );
   
   //Write the ISBN attribute.
   writer->WriteAttributeString( "ISBN", "1-8630-014" );
   
   //Write the title.
   writer->WriteElementString( "title", "The Handmaid's Tale"
 );
   
   //Write the style element.
   writer->WriteStartElement( "style" );
   writer->WriteEntityRef( "h" );
   writer->WriteEndElement();
   
   //Write the price.
   writer->WriteElementString( "price", "19.95" );
   
   //Write CDATA.
   writer->WriteCData( "Prices 15% off!!" );
   
   //Write the close tag for the root element.
   writer->WriteEndElement();
   writer->WriteEndDocument();
   
   //Write the XML to file and close the writer.
   writer->Flush();
   writer->Close();
   
   //Load the file into an XmlDocument to ensure well formed XML.
   XmlDocument^ doc = gcnew XmlDocument;
   
   //Preserve white space for readability.
   doc->PreserveWhitespace = true;
   
   //Load the file.
   doc->Load( filename );
   
   //Display the XML content to the console.
   Console::Write( doc->InnerXml );
}

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

public class Sample
{
    private static String fileName = "sampledata.xml";

    public static void main(String[]
 args)
    {
        XmlTextWriter writer = null;
        writer = new XmlTextWriter(fileName, null);

        //Use indenting for readability.
        writer.set_Formatting(Formatting.Indented);

        //Write the XML delcaration. 
        writer.WriteStartDocument();

        //Write the ProcessingInstruction node.
        String piText = "type='text/xsl' href='book.xsl'";
        writer.WriteProcessingInstruction("xml-stylesheet", piText);

        //Write the DocumentType node.
        writer.WriteDocType("book", null, null,
 "<!ENTITY h 'hardcover'>");

        //Write a Comment node.
        writer.WriteComment("sample XML");

        //Write a root element.
        writer.WriteStartElement("book");

        //Write the genre attribute.
        writer.WriteAttributeString("genre", "novel");

        //Write the ISBN attribute.
        writer.WriteAttributeString("ISBN", "1-8630-014");

        //Write the title.
        writer.WriteElementString("title", "The Handmaid's Tale");

        //Write the style element.
        writer.WriteStartElement("style");
        writer.WriteEntityRef("h");
        writer.WriteEndElement();

        //Write the price.
        writer.WriteElementString("price", "19.95");

        //Write CDATA.
        writer.WriteCData("Prices 15% off!!");

        //Write the close tag for the root element.
        writer.WriteEndElement();
        writer.WriteEndDocument();

        //Write the XML to file and close the writer.
        writer.Flush();
        writer.Close();

        //Load the file into an XmlDocument to ensure well formed XML.
        XmlDocument doc =  new XmlDocument();

        //Preserve white space for readability.
        doc.set_PreserveWhitespace(true);

        //Load the file.
        doc.Load(fileName);

        //Display the XML content to the console.
        Console.Write(doc.get_InnerXml());
    } //main 
} //Sample
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