XmlWriter.WriteDocType(String, String, String, String) XmlWriter.WriteDocType(String, String, String, String) XmlWriter.WriteDocType(String, String, String, String) XmlWriter.WriteDocType(String, String, String, String) Method

定義

在衍生類別中覆寫時,寫入具有指定名稱與選擇性屬性的 DOCTYPE 宣告。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);
abstract member WriteDocType : string * string * string * string -> unit
Public MustOverride Sub WriteDocType (name As String, pubid As String, sysid As String, subset As String)

參數

name
String String String String

DOCTYPE 名稱。The name of the DOCTYPE. 這必須不是空白的。This must be non-empty.

pubid
String String String String

如果為非 null,它也會寫入 PUBLIC "pubid" "sysid",其中 pubidsysid 會替換為指定之引數的值。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

如果 pubidnull,而 sysid 為非 null,則它會寫入 SYSTEM "sysid",其中 sysid 會由這個引數的值所取代。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

如果非 Null,它會寫入 [subset],其中 subset 由這個引數的值來替代。If non-null it writes [subset] where subset is replaced with the value of this argument.

例外狀況

從初構的外部 (在根項目之後) 呼叫這個方法。This method was called outside the prolog (after the root element).

-或--or-

在先前的非同步作業完成前呼叫了 XmlWriter 方法。An XmlWriter method was called before a previous asynchronous operation finished. 在此情況下,會擲回 InvalidOperationException 與「非同步作業已經在進行中」的訊息。In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

name 的值將導致無效的 XML。The value for name would result in invalid XML.

範例

下列範例會寫入代表書籍的 XML 檔案。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 'Main 
End Class 'Sample

備註

這個方法不會在、 pubid sysidsubset中檢查是否有不正確字元。This method does not check for invalid characters in pubid, sysid or subset. 它也不會檢查內部子集的格式是否正確。It also does not check that the internal subset is well-formed.

重要

不會驗證傳遞WriteDocType至方法的資料。 XmlWriterThe XmlWriter does not validate the data that is passed to the WriteDocType method. 您不應該將任意資料傳遞給這個方法。You should not pass arbitrary data to this method.

如需這個方法的非同步版本,請WriteDocTypeAsync參閱。For the asynchronous version of this method, see WriteDocTypeAsync.

適用於