XmlWriter.WriteDocType(String, String, String, String) Método

Definição

Quando substituído em uma classe derivada, grava a declaração DOCTYPE com o nome especificado e os atributos opcionais.When overridden in a derived class, writes the DOCTYPE declaration with the specified name and optional attributes.

public:
 abstract void WriteDocType(System::String ^ name, System::String ^ pubid, System::String ^ sysid, System::String ^ subset);
public abstract void WriteDocType (string name, string pubid, string sysid, string subset);
public abstract void WriteDocType (string name, string? pubid, string? sysid, string? subset);
abstract member WriteDocType : string * string * string * string -> unit
Public MustOverride Sub WriteDocType (name As String, pubid As String, sysid As String, subset As String)

Parâmetros

name
String

O nome do DOCTYPE.The name of the DOCTYPE. Isso deve ser não vazio.This must be non-empty.

pubid
String

Se for não nulo, ele também gravará PUBLIC "pubid" "sysid", em que pubid e sysid são substituídos pelo valor dos argumentos fornecidos.If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.

sysid
String

Se pubid for null e sysid for não nulo, ele gravará SYSTEM "sysid", em que sysid será substituído pelo valor desse argumento.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

Se não for nulo, ele gravará [subset], em que subset é substituído pelo valor desse argumento.If non-null it writes [subset] where subset is replaced with the value of this argument.

Exceções

Esse método foi chamado fora do prólogo (após o elemento raiz).This method was called outside the prolog (after the root element).

- ou --or-

Um método XmlWriter foi chamado antes do término de uma operação assíncrona anterior.An XmlWriter method was called before a previous asynchronous operation finished. Nesse caso, InvalidOperationException será gerado com a mensagem “Uma operação assíncrona já está em andamento”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

O valor de name resultaria em um XML inválido.The value for name would result in invalid XML.

Exemplos

O exemplo a seguir grava um arquivo XML que representa um livro.The following example writes an XML file representing a book.

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

public class Sample {

  private const string filename = "sampledata.xml";

  public static void Main() {

     XmlWriterSettings settings = new XmlWriterSettings();
     settings.Indent = true;
     XmlWriter writer = XmlWriter.Create(filename, settings);

     // Write the Processing Instruction 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 the 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();
  }
}
Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Const filename As String = "sampledata.xml"
    
  Public Shared Sub Main()

     Dim settings As XmlWriterSettings = new XmlWriterSettings()
     settings.Indent = true
     Dim writer As XmlWriter = XmlWriter.Create(filename, settings)
        
     ' Write the Processing Instruction 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 the 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()
        
    End Sub
End Class

Comentários

Esse método não verifica se há caracteres inválidos no pubid sysid ou subset .This method does not check for invalid characters in pubid, sysid or subset. Ele também não verifica se o subconjunto interno está bem formado.It also does not check that the internal subset is well-formed.

Importante

O XmlWriter não valida os dados que são passados para o WriteDocType método.The XmlWriter does not validate the data that is passed to the WriteDocType method. Você não deve passar dados arbitrários para esse método.You should not pass arbitrary data to this method.

Para obter a versão assíncrona desse método, consulte WriteDocTypeAsync .For the asynchronous version of this method, see WriteDocTypeAsync.

Aplica-se a