Compartir a través de


XmlTextWriter.WriteQualifiedName(String, String) Método

Definición

Escribe el nombre completo del espacio de nombres. Este método busca un prefijo que está en el ámbito del espacio de nombres especificado.

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

Parámetros

localName
String

Nombre local que se va a escribir.

ns
String

URI de espacio de nombres que se va a asociar al nombre.

Excepciones

localName es null o String.Empty.

localName no es un nombre válido según la especificación relativa a espacios de nombres del Consorcio W3C.

Ejemplos

En el ejemplo siguiente se escribe una parte de un esquema XSD.

#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 root element.
   writer->WriteStartElement( "schema" );
   
   // Write the namespace declarations.
   writer->WriteAttributeString( "xmlns", nullptr, "http://www.w3.org/2001/XMLSchema" );
   writer->WriteAttributeString( "xmlns", "po", nullptr, "http://contoso.com/po" );
   writer->WriteStartElement( "element" );
   writer->WriteAttributeString( "name", "purchaseOrder" );
   
   // Write the type attribute.
   writer->WriteStartAttribute( nullptr, "type", nullptr );
   writer->WriteQualifiedName( "PurchaseOrder", "http://contoso.com/po" );
   writer->WriteEndAttribute();
   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 = gcnew 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 );
}
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 root element.
     writer.WriteStartElement("schema");

     // Write the namespace declarations.
     writer.WriteAttributeString("xmlns", null,"http://www.w3.org/2001/XMLSchema");
     writer.WriteAttributeString("xmlns","po",null,"http://contoso.com/po");

     writer.WriteStartElement("element");

     writer.WriteAttributeString("name", "purchaseOrder");

     // Write the type attribute.
     writer.WriteStartAttribute(null,"type", null);
     writer.WriteQualifiedName("PurchaseOrder", "http://contoso.com/po");
     writer.WriteEndAttribute();

     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 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 root element.
        writer.WriteStartElement("schema")
        
        ' Write the namespace declarations.
        writer.WriteAttributeString("xmlns", Nothing, "http://www.w3.org/2001/XMLSchema")
        writer.WriteAttributeString("xmlns", "po", Nothing, "http://contoso.com/po")
        
        writer.WriteStartElement("element")
        
        writer.WriteAttributeString("name", "purchaseOrder")
        
        ' Write the type attribute.
        writer.WriteStartAttribute(Nothing, "type", Nothing)
        writer.WriteQualifiedName("PurchaseOrder", "http://contoso.com/po")
        writer.WriteEndAttribute()
        
        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

Comentarios

Nota

A partir de la .NET Framework 2.0, se recomienda crear XmlWriter instancias mediante el XmlWriter.Create método y la XmlWriterSettings clase para aprovechar las nuevas funcionalidades.

Por ejemplo, el siguiente código de Microsoft Visual C#:

writer.Formatting = Formatting.Indented;  
writer.WriteStartElement("root");  
 writer.WriteAttributeString("xmlns","x",null,"urn:abc");  
 writer.WriteStartElement("item");  
 writer.WriteStartAttribute("href",null);  
 writer.WriteString("#");  
 writer.WriteQualifiedName("test","urn:abc");  
 writer.WriteEndAttribute();  
 writer.WriteEndElement();  
 writer.WriteEndElement();  
 writer.Close();  

Se genera el siguiente código resultado:

<root xmlns:x="urn:abc">  
 <item href="#x:test"/>  
 </root>  

Si ns se asigna al espacio de nombres predeterminado actual, no se genera ningún prefijo.

Al escribir valores de atributo, este método genera un prefijo si ns no se encuentra. Al escribir contenido de elemento, produce una excepción si ns no se encuentra.

Si este escritor admite espacios de nombres (Namespaces se establece trueen ), este método también comprueba que el nombre es válido según los espacios de nombres W3C en la recomendación XML.

Se aplica a