XmlWriter.WriteComment(String) 方法

定義

命名空間:
System.Xml
組件:
System.Xml.dll, System.Xml.ReaderWriter.dll
組件:
netstandard.dll, System.Xml.ReaderWriter.dll
組件:
System.Xml.ReaderWriter.dll
組件:
System.Xml.dll
組件:
netstandard.dll
來源:
XmlWriter.cs
來源:
XmlWriter.cs
來源:
XmlWriter.cs
來源:
XmlWriter.cs
來源:
XmlWriter.cs

當在派生類別中被覆寫時，會寫出包含指定文字的註解 <--...--> 。

public:
 abstract void WriteComment(System::String ^ text);
public abstract void WriteComment(string text);
public abstract void WriteComment(string? text);
abstract member WriteComment : string -> unit
Public MustOverride Sub WriteComment (text As String)

參數

text
String

留言裡要放文字。

例外狀況

ArgumentException

這些文字會產生不完整格式的 XML 文件。

InvalidOperationException

在先前非同步操作結束前，會呼叫一個 XmlWriter 方法。 此時， InvalidOperationException 會拋出「非同步操作已進行中」的訊息。

範例

以下範例撰寫一個代表書籍的 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

若 text 是 null 或 String.Empty，此方法會寫入無資料內容的註解，例如 <---->。

如果 text 包含兩個破折號的無效序列「--」，則 XmlWriter 可以拋出 ArgumentException 一個（XmlTextWriter 物件）或在「-」之間插入空格，使文字成為有效的XML註解（XmlWriter 由方法 Create 產生的物件）。

關於此方法的非同步版本，請參見 WriteCommentAsync。

適用於