XmlTextWriter.WriteDocType(String, String, String, String) XmlTextWriter.WriteDocType(String, String, String, String) XmlTextWriter.WriteDocType(String, String, String, String) XmlTextWriter.WriteDocType(String, String, String, String) Method

Definizione

Scrive la dichiarazione DOCTYPE con il nome e gli attributi opzionali specificati.Writes the DOCTYPE declaration with the specified name and optional attributes.

public:
 override void WriteDocType(System::String ^ name, System::String ^ pubid, System::String ^ sysid, System::String ^ subset);
public override void WriteDocType (string name, string pubid, string sysid, string subset);
override this.WriteDocType : string * string * string * string -> unit
Public Overrides Sub WriteDocType (name As String, pubid As String, sysid As String, subset As String)

Parametri

name
String String String String

Nome per la dichiarazione DOCTYPE.The name of the DOCTYPE. Questo parametro non deve essere vuoto.This must be non-empty.

pubid
String String String String

Se questo parametro è non null, viene scritto anche PUBLIC "pubid" "sysid", dove pubid e sysid vengono sostituiti con il valore degli argomenti specificati.If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.

sysid
String String String String

Se il parametro pubid è null e il parametro sysid è non null, viene scritto SYSTEM "sysid", dove sysid viene sostituito con il valore di questo argomento.If pubid is null and sysid is non-null it writes SYSTEM "sysid" where sysid is replaced with the value of this argument.

subset
String String String String

Se diverso da Null, scrive [subset], che viene sostituito dal valore di questo argomento.If non-null it writes [subset] where subset is replaced with the value of this argument.

Eccezioni

Questo metodo è stato chiamato fuori dal prologo, ovvero dopo l'elemento radice.This method was called outside the prolog (after the root element).

name è null o String.Empty.name is null or String.Empty

-oppure--or- Il risultato del valore del parametro name è un documento XML non valido.the value for name would result in invalid XML.

Esempi

Nell'esempio seguente viene scritto un file XML che rappresenta un libro.The following example writes an XML file representing a book.

#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 );
}

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);  

  }

}
Option Explicit
Option Strict

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
End Class

Commenti

Nota

A partire da .NET Framework 2,0, è consigliabile creare XmlWriter istanze usando il XmlWriter.Create metodo e la XmlWriterSettings classe per sfruttare le nuove funzionalità.Starting with the .NET Framework 2.0, we recommend that you create XmlWriter instances by using the XmlWriter.Create method and the XmlWriterSettings class to take advantage of new functionality.

Questo metodo non verifica la presenza di caratteri non pubidvalidi sysid in subseto.This method does not check for invalid characters in pubid, sysid or subset. Non verifica inoltre che il subset interno sia ben formato.It also does not check that the internal subset is well-formed.

Importante

Non convalida i dati passati WriteDocType al metodo. XmlTextWriterThe XmlTextWriter does not validate any data that is passed to the WriteDocType method. Non passare dati arbitrari a questo metodo.You should not pass arbitrary data to this method.

Si applica a