XmlTextWriter.WriteStartAttribute(String, String, String) メソッド

定義

名前空間:
System.Xml
アセンブリ:
netstandard.dll, System.Xml.ReaderWriter.dll
アセンブリ:
System.Xml.ReaderWriter.dll
アセンブリ:
System.Xml.dll
アセンブリ:
netstandard.dll
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs

属性の先頭を書き込みます。

public:
 override void WriteStartAttribute(System::String ^ prefix, System::String ^ localName, System::String ^ ns);
public override void WriteStartAttribute(string? prefix, string localName, string? ns);
public override void WriteStartAttribute(string prefix, string localName, string ns);
override this.WriteStartAttribute : string * string * string -> unit
Public Overrides Sub WriteStartAttribute (prefix As String, localName As String, ns As String)

パラメーター

prefix
String

Namespace 属性のプレフィックス。

localName
String

LocalName 属性の を指定します。

ns
String

NamespaceURI 属性の を指定します。

例外

ArgumentException

localName は null または String.Emptyです。

例

次の例では、書籍を書き出します。

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

public class Sample
{
  private const string filename = "sampledata.xml";

  public static void Main()
  {

     XmlTextWriter writer = new XmlTextWriter (filename, null);
     //Use indenting for readability.
     writer.Formatting = Formatting.Indented;

     writer.WriteComment("sample XML fragment");

     //Write an element (this one is the root).
     writer.WriteStartElement("bookstore");

     //Write the namespace declaration.
     writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");

     writer.WriteStartElement("book");

     //Lookup the prefix and then write the ISBN attribute.
     string prefix = writer.LookupPrefix("urn:samples");
     writer.WriteStartAttribute(prefix, "ISBN", "urn:samples");
     writer.WriteString("1-861003-78");
     writer.WriteEndAttribute();

     //Write the title.
     writer.WriteStartElement("title");
     writer.WriteString("The Handmaid's Tale");
     writer.WriteEndElement();

     //Write the price.
     writer.WriteElementString("price", "19.95");

     //Write the style element.
     writer.WriteStartElement(prefix, "style", "urn:samples");
     writer.WriteString("hardcover");
     writer.WriteEndElement();

     //Write the end tag for the book element.
     writer.WriteEndElement();

     //Write the close tag for the root element.
     writer.WriteEndElement();

     //Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();

     //Read the file back in and parse to ensure well formed XML.
     XmlDocument doc = new XmlDocument();
     //Preserve white space for readability.
     doc.PreserveWhitespace = true;
     //Load the file
     doc.Load(filename);

     //Write the XML content to the console.
     Console.Write(doc.InnerXml);
  }
}

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared filename As String = "sampledata.xml"
    Public Shared Sub Main()
        
        Dim writer As New XmlTextWriter(filename, Nothing)
        'Use indenting for readability.
        writer.Formatting = Formatting.Indented
        
        writer.WriteComment("sample XML fragment")
        
        'Write an element (this one is the root).
        writer.WriteStartElement("bookstore")
        
        'Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples")
        
        writer.WriteStartElement("book")
        
        'Lookup the prefix and then write the ISBN attribute.
        Dim prefix As String = writer.LookupPrefix("urn:samples")
        writer.WriteStartAttribute(prefix, "ISBN", "urn:samples")
        writer.WriteString("1-861003-78")
        writer.WriteEndAttribute()
        
        'Write the title.
        writer.WriteStartElement("title")
        writer.WriteString("The Handmaid's Tale")
        writer.WriteEndElement()
        
        'Write the price.
        writer.WriteElementString("price", "19.95")
        
        'Write the style element.
        writer.WriteStartElement(prefix, "style", "urn:samples")
        writer.WriteString("hardcover")
        writer.WriteEndElement()
        
        'Write the end tag for the book element.
        writer.WriteEndElement()
        
        'Write the close tag for the root element.
        writer.WriteEndElement()
        
        'Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        'Read the file back in and parse to ensure well formed XML.
        Dim doc As New XmlDocument()
        'Preserve white space for readability.
        doc.PreserveWhitespace = True
        'Load the file.
        doc.Load(filename)
        
        'Write the XML content to the console.
        Console.Write(doc.InnerXml)
    End Sub
End Class

注釈

Note

新しい機能を利用するには、XmlWriter メソッドと XmlWriter.Create クラスを使用してXmlWriterSettings インスタンスを作成することをお勧めします。

これは、WriteAttributeStringなどの複数の書き込みメソッドを使用して属性値を書き込むWriteStringのより高度なバージョンです。

適用対象

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