XmlWriter.WriteDocType(String, String, String, String) 方法

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。

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)

參數

name
String

DOCTYPE 名稱。 這必須不是空白的。

pubid
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。

sysid
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。

subset
String

如果非 Null,它會寫入 [subset],其中 subset 由這個引數的值來替代。

例外狀況

從初構的外部 (在根項目之後) 呼叫這個方法。

-或-

在先前的非同步作業完成前呼叫了 XmlWriter 方法。 在此情況下,會擲回 InvalidOperationException 與「非同步作業已經在進行中」的訊息。

name 的值將導致無效的 XML。

範例

下列範例會寫入代表書籍的 XML 檔案。

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

備註

這個方法不會檢查 、 sysidsubset 中的 pubid 無效字元。 它也不會檢查內部子集的格式正確。

重要

XmlWriter不會驗證傳遞至 WriteDocType 方法的資料。 您不應該將任意資料傳遞至這個方法。

如需這個方法的非同步版本,請參閱 WriteDocTypeAsync

適用於