XmlTextWriter.WriteProcessingInstruction(String, String) Método
Definição
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
Grava uma instrução de processamento com um espaço entre o nome e o texto da seguinte maneira: <?nome texto?>.
public:
override void WriteProcessingInstruction(System::String ^ name, System::String ^ text);
public override void WriteProcessingInstruction (string name, string? text);
public override void WriteProcessingInstruction (string name, string text);
override this.WriteProcessingInstruction : string * string -> unit
Public Overrides Sub WriteProcessingInstruction (name As String, text As String)
Parâmetros
- name
- String
Nome da instrução de processamento.
- text
- String
Texto a ser incluído na instrução de processamento.
Exceções
O texto poderia resultar em um documento XML malformado.
name
é null
ou String.Empty
.
Esse método está sendo usado para criar uma declaração XML após uma chamada a WriteStartDocument().
Exemplos
O exemplo a seguir grava um arquivo XML representando um livro.
#using <System.Xml.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
XmlTextWriter^ writer = nullptr;
String^ filename = "sampledata.xml";
writer = gcnew XmlTextWriter( filename, nullptr );
//Use indenting for readability.
writer->Formatting = Formatting::Indented;
//Write the XML delcaration.
writer->WriteStartDocument();
//Write the ProcessingInstruction node.
String^ PItext = "type='text/xsl' href='book.xsl'";
writer->WriteProcessingInstruction( "xml-stylesheet", PItext );
//Write the DocumentType node.
writer->WriteDocType( "book", nullptr, nullptr, "<!ENTITY h 'hardcover'>" );
//Write a Comment node.
writer->WriteComment( "sample XML" );
//Write a 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();
//Load the file into an XmlDocument to ensure well formed XML.
XmlDocument^ doc = gcnew XmlDocument;
//Preserve white space for readability.
doc->PreserveWhitespace = true;
//Load the file.
doc->Load( filename );
//Display the XML content to the console.
Console::Write( doc->InnerXml );
}
using System;
using System.IO;
using System.Xml;
public class Sample
{
private const string filename = "sampledata.xml";
public static void Main()
{
XmlTextWriter writer = null;
writer = new XmlTextWriter (filename, null);
//Use indenting for readability.
writer.Formatting = Formatting.Indented;
//Write the XML delcaration.
writer.WriteStartDocument();
//Write the ProcessingInstruction 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 a 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();
//Load the file into an XmlDocument to ensure well formed XML.
XmlDocument doc = new XmlDocument();
//Preserve white space for readability.
doc.PreserveWhitespace = true;
//Load the file.
doc.Load(filename);
//Display the XML content to the console.
Console.Write(doc.InnerXml);
}
}
Option Explicit
Option Strict
Imports System.IO
Imports System.Xml
Public Class Sample
Private Shared filename As String = "sampledata.xml"
Public Shared Sub Main()
Dim writer As XmlTextWriter = Nothing
writer = New XmlTextWriter(filename, Nothing)
'Use indenting for readability.
writer.Formatting = Formatting.Indented
'Write the XML delcaration.
writer.WriteStartDocument()
'Write the ProcessingInstruction 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 a 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()
'Load the file into an XmlDocument to ensure well formed XML.
Dim doc As New XmlDocument()
'Preserve white space for readability.
doc.PreserveWhitespace = True
'Load the file.
doc.Load(filename)
'Display the XML content to the console.
Console.Write(doc.InnerXml)
End Sub
End Class
Comentários
Observação
A partir do .NET Framework 2.0, recomendamos que você crie XmlWriter instâncias usando o XmlWriter.Create método e a XmlWriterSettings classe para aproveitar a nova funcionalidade.
Se text
for null
ou String.Empty
, esse método grava um ProcessingInstruction
sem conteúdo de dados, por exemplo <?name?>.