XmlWriter.WriteDocType(String, String, String, String) Metoda

Definice

Při přepsání v odvozené třídě zapíše deklaraci DOCTYPE se zadaným názvem a nepovinnými atributy.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)

Parametry

name
String

Název typu DOCTYPE.The name of the DOCTYPE. Tento řetězec nesmí být prázdný.This must be non-empty.

pubid
String

Pokud hodnota, která není null, také zapisuje PUBLIC "pubid" "sysid", kde pubid a sysid jsou nahrazeny hodnotou daných argumentů.If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.

sysid
String

Pokud pubid je null a sysid je jiný než null, zapisuje systém "sysid", kde sysid je nahrazen hodnotou tohoto argumentu.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

Pokud není null, zapisuje [podmnožinu], kde je podmnožina nahrazena hodnotou tohoto argumentu.If non-null it writes [subset] where subset is replaced with the value of this argument.

Výjimky

Tato metoda byla volána mimo prolog (po kořenovém elementu).This method was called outside the prolog (after the root element).

-nebo--or-

XmlWriterMetoda byla volána před dokončením předchozí asynchronní operace.An XmlWriter method was called before a previous asynchronous operation finished. V tomto případě InvalidOperationException je vyvolána se zprávou "asynchronní operace již probíhá".In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Výsledkem hodnoty pro name by byl neplatný kód XML.The value for name would result in invalid XML.

Příklady

Následující příklad zapisuje soubor XML reprezentující knihu.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

Poznámky

Tato metoda nekontroluje neplatné znaky v pubid , sysid nebo subset .This method does not check for invalid characters in pubid, sysid or subset. Nekontroluje také, zda je vnitřní podmnožina správně vytvořena.It also does not check that the internal subset is well-formed.

Důležité

XmlWriterNeověřuje data, která jsou předána WriteDocType metodě.The XmlWriter does not validate the data that is passed to the WriteDocType method. Do této metody byste neměli předávat libovolná data.You should not pass arbitrary data to this method.

Asynchronní verze této metody naleznete v tématu WriteDocTypeAsync .For the asynchronous version of this method, see WriteDocTypeAsync.

Platí pro