XmlWriter.WriteElementString Método

Definición

Escribe un elemento que contiene un valor de cadena.Writes an element containing a string value.

Sobrecargas

WriteElementString(String, String)

Escribe un elemento con el nombre local y el valor especificados.Writes an element with the specified local name and value.

WriteElementString(String, String, String)

Escribe un elemento con el nombre local especificado, el URI de espacio de nombres y el valor.Writes an element with the specified local name, namespace URI, and value.

WriteElementString(String, String, String, String)

Escribe un elemento con el prefijo, nombre local, el URI de espacio de nombres y el valor especificados.Writes an element with the specified prefix, local name, namespace URI, and value.

Comentarios

Para obtener la versión asincrónica de este método, vea WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

WriteElementString(String, String)

Escribe un elemento con el nombre local y el valor especificados.Writes an element with the specified local name and value.

public:
 void WriteElementString(System::String ^ localName, System::String ^ value);
public void WriteElementString (string localName, string value);
public void WriteElementString (string localName, string? value);
member this.WriteElementString : string * string -> unit
Public Sub WriteElementString (localName As String, value As String)

Parámetros

localName
String

Nombre local del elemento.The local name of the element.

value
String

Valor del elemento.The value of the element.

Excepciones

El valor localName es null o una cadena vacía.The localName value is null or an empty string.

o bien-or- Los valores de parámetro no son válidos.The parameter values are not valid.

Hay un carácter en el búfer que es un carácter XML válido pero que no es válido para la codificación de salida.There is a character in the buffer that is a valid XML character but is not valid for the output encoding. Por ejemplo, si la codificación de salida es ASCII, sólo debería utilizar los caracteres del intervalo de 0 a 127 para el elemento y nombres de atributo.For example, if the output encoding is ASCII, you should only use characters from the range of 0 to 127 for element and attribute names. El carácter no válido podría estar en el argumento de este método o en un argumento de métodos anteriores que estaban escribiendo en el búfer.The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Las referencias a entidades de caracteres anulan a dichos caracteres siempre que sea posible (por ejemplo, en nodos de texto o valores de atributo).Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). Sin embargo, la referencia de entidad de carácter no se permite en nombres de elemento y de atributo, comentarios, instrucciones de procesamiento o secciones CDATA.However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

Se llamó un método XmlWriter antes de que se termine una operación asincrónica anterior.An XmlWriter method was called before a previous asynchronous operation finished. En este caso, se genera InvalidOperationException con el mensaje “Ya hay una operación asincrónica en curso”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Ejemplos

En el ejemplo siguiente se usan varios métodos de escritura para crear un fragmento XML.The following example uses several write methods to create an XML fragment.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
public ref class Sample
{
private:
   static String^ m_Document = L"sampledata.xml";

public:
   static void Main()
   {
      XmlWriter^ writer = nullptr;
      try
      {
         XmlWriterSettings^ settings = gcnew XmlWriterSettings;
         settings->Indent = true;
         writer = XmlWriter::Create( m_Document,settings );
         writer->WriteComment( L"sample XML fragment" );
         
         // Write an element (this one is the root).
         writer->WriteStartElement( L"book" );
         
         // Write the namespace declaration.
         writer->WriteAttributeString( L"xmlns", L"bk", nullptr, L"urn:samples" );
         
         // Write the genre attribute.
         writer->WriteAttributeString( L"genre", L"novel" );
         
         // Write the title.
         writer->WriteStartElement( L"title" );
         writer->WriteString( L"The Handmaid's Tale" );
         writer->WriteEndElement();
         
         // Write the price.
         writer->WriteElementString( L"price", L"19.95" );
         
         // Lookup the prefix and write the ISBN element.
         String^ prefix = writer->LookupPrefix( L"urn:samples" );
         writer->WriteStartElement( prefix, L"ISBN", L"urn:samples" );
         writer->WriteString( L"1-861003-78" );
         writer->WriteEndElement();
         
         // Write the style element (shows a different way to handle prefixes).
         writer->WriteElementString( L"style", L"urn:samples", L"hardcover" );
         
         // Write the close tag for the root element.
         writer->WriteEndElement();
         
         // Write the XML to file and close the writer.
         writer->Flush();
         writer->Close();
      }
      finally
      {
         if ( writer != nullptr )
                  writer->Close();
      }

   }

};

void main()
{
   Sample::Main();
}

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

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

   public static void Main() {

      XmlWriter writer = null;

      try {

        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        writer = XmlWriter.Create (m_Document, settings);

        writer.WriteComment("sample XML fragment");

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

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

        // Write the genre attribute.
        writer.WriteAttributeString("genre", "novel");

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

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

        // Lookup the prefix and write the ISBN element.
        string prefix = writer.LookupPrefix("urn:samples");
        writer.WriteStartElement(prefix, "ISBN", "urn:samples");
        writer.WriteString("1-861003-78");
        writer.WriteEndElement();

        // Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover");

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

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

      finally {
        if (writer != null)
           writer.Close();
     }
   }
 }
Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared m_Document As String = "sampledata.xml"
    
    Public Shared Sub Main()
        Dim writer As XmlWriter = Nothing
        
      Try

        Dim settings As XmlWriterSettings = new XmlWriterSettings()
        settings.Indent = true
        writer = XmlWriter.Create (m_Document, settings)
            
        writer.WriteComment("sample XML fragment")
            
        ' Write an element (this one is the root).
        writer.WriteStartElement("book")
            
        ' Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples")
            
        ' Write the genre attribute.
        writer.WriteAttributeString("genre", "novel")
            
        ' Write the title.
        writer.WriteStartElement("title")
        writer.WriteString("The Handmaid's Tale")
        writer.WriteEndElement()
            
        ' Write the price.
        writer.WriteElementString("price", "19.95")
            
        ' Lookup the prefix and write the ISBN element.
        Dim prefix As String = writer.LookupPrefix("urn:samples")
        writer.WriteStartElement(prefix, "ISBN", "urn:samples")
        writer.WriteString("1-861003-78")
        writer.WriteEndElement()
            
        ' Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover")
            
        ' Write the close tag for the root element.
        writer.WriteEndElement()
            
        ' Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        Finally
            If Not (writer Is Nothing) Then
                writer.Close()
            End If
        End Try

    End Sub
End Class

Comentarios

Para obtener la versión asincrónica de este método, vea WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

Se aplica a

WriteElementString(String, String, String)

Escribe un elemento con el nombre local especificado, el URI de espacio de nombres y el valor.Writes an element with the specified local name, namespace URI, and value.

public:
 void WriteElementString(System::String ^ localName, System::String ^ ns, System::String ^ value);
public void WriteElementString (string localName, string ns, string value);
public void WriteElementString (string localName, string? ns, string? value);
member this.WriteElementString : string * string * string -> unit
Public Sub WriteElementString (localName As String, ns As String, value As String)

Parámetros

localName
String

Nombre local del elemento.The local name of the element.

ns
String

Identificador URI de espacio de nombres que se va a asociar al elemento.The namespace URI to associate with the element.

value
String

Valor del elemento.The value of the element.

Excepciones

El valor localName es null o una cadena vacía.The localName value is null or an empty string.

o bien-or- Los valores de parámetro no son válidos.The parameter values are not valid.

Hay un carácter en el búfer que es un carácter XML válido pero que no es válido para la codificación de salida.There is a character in the buffer that is a valid XML character but is not valid for the output encoding. Por ejemplo, si la codificación de salida es ASCII, sólo debería utilizar los caracteres del intervalo de 0 a 127 para el elemento y nombres de atributo.For example, if the output encoding is ASCII, you should only use characters from the range of 0 to 127 for element and attribute names. El carácter no válido podría estar en el argumento de este método o en un argumento de métodos anteriores que estaban escribiendo en el búfer.The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Las referencias a entidades de caracteres anulan a dichos caracteres siempre que sea posible (por ejemplo, en nodos de texto o valores de atributo).Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). Sin embargo, la referencia de entidad de carácter no se permite en nombres de elemento y de atributo, comentarios, instrucciones de procesamiento o secciones CDATA.However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

Se llamó un método XmlWriter antes de que se termine una operación asincrónica anterior.An XmlWriter method was called before a previous asynchronous operation finished. En este caso, se genera InvalidOperationException con el mensaje “Ya hay una operación asincrónica en curso”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Ejemplos

En el ejemplo siguiente se usan varios métodos de escritura para crear un fragmento XML.The following example uses several write methods to create an XML fragment.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
public ref class Sample
{
private:
   static String^ m_Document = L"sampledata.xml";

public:
   static void Main()
   {
      XmlWriter^ writer = nullptr;
      try
      {
         XmlWriterSettings^ settings = gcnew XmlWriterSettings;
         settings->Indent = true;
         writer = XmlWriter::Create( m_Document,settings );
         writer->WriteComment( L"sample XML fragment" );
         
         // Write an element (this one is the root).
         writer->WriteStartElement( L"book" );
         
         // Write the namespace declaration.
         writer->WriteAttributeString( L"xmlns", L"bk", nullptr, L"urn:samples" );
         
         // Write the genre attribute.
         writer->WriteAttributeString( L"genre", L"novel" );
         
         // Write the title.
         writer->WriteStartElement( L"title" );
         writer->WriteString( L"The Handmaid's Tale" );
         writer->WriteEndElement();
         
         // Write the price.
         writer->WriteElementString( L"price", L"19.95" );
         
         // Lookup the prefix and write the ISBN element.
         String^ prefix = writer->LookupPrefix( L"urn:samples" );
         writer->WriteStartElement( prefix, L"ISBN", L"urn:samples" );
         writer->WriteString( L"1-861003-78" );
         writer->WriteEndElement();
         
         // Write the style element (shows a different way to handle prefixes).
         writer->WriteElementString( L"style", L"urn:samples", L"hardcover" );
         
         // Write the close tag for the root element.
         writer->WriteEndElement();
         
         // Write the XML to file and close the writer.
         writer->Flush();
         writer->Close();
      }
      finally
      {
         if ( writer != nullptr )
                  writer->Close();
      }

   }

};

void main()
{
   Sample::Main();
}

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

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

   public static void Main() {

      XmlWriter writer = null;

      try {

        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        writer = XmlWriter.Create (m_Document, settings);

        writer.WriteComment("sample XML fragment");

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

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

        // Write the genre attribute.
        writer.WriteAttributeString("genre", "novel");

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

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

        // Lookup the prefix and write the ISBN element.
        string prefix = writer.LookupPrefix("urn:samples");
        writer.WriteStartElement(prefix, "ISBN", "urn:samples");
        writer.WriteString("1-861003-78");
        writer.WriteEndElement();

        // Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover");

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

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

      finally {
        if (writer != null)
           writer.Close();
     }
   }
 }
Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared m_Document As String = "sampledata.xml"
    
    Public Shared Sub Main()
        Dim writer As XmlWriter = Nothing
        
      Try

        Dim settings As XmlWriterSettings = new XmlWriterSettings()
        settings.Indent = true
        writer = XmlWriter.Create (m_Document, settings)
            
        writer.WriteComment("sample XML fragment")
            
        ' Write an element (this one is the root).
        writer.WriteStartElement("book")
            
        ' Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples")
            
        ' Write the genre attribute.
        writer.WriteAttributeString("genre", "novel")
            
        ' Write the title.
        writer.WriteStartElement("title")
        writer.WriteString("The Handmaid's Tale")
        writer.WriteEndElement()
            
        ' Write the price.
        writer.WriteElementString("price", "19.95")
            
        ' Lookup the prefix and write the ISBN element.
        Dim prefix As String = writer.LookupPrefix("urn:samples")
        writer.WriteStartElement(prefix, "ISBN", "urn:samples")
        writer.WriteString("1-861003-78")
        writer.WriteEndElement()
            
        ' Write the style element (shows a different way to handle prefixes).
        writer.WriteElementString("style", "urn:samples", "hardcover")
            
        ' Write the close tag for the root element.
        writer.WriteEndElement()
            
        ' Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        Finally
            If Not (writer Is Nothing) Then
                writer.Close()
            End If
        End Try

    End Sub
End Class

Comentarios

Para obtener la versión asincrónica de este método, vea WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

Se aplica a

WriteElementString(String, String, String, String)

Escribe un elemento con el prefijo, nombre local, el URI de espacio de nombres y el valor especificados.Writes an element with the specified prefix, local name, namespace URI, and value.

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

Parámetros

prefix
String

Prefijo del elemento.The prefix of the element.

localName
String

Nombre local del elemento.The local name of the element.

ns
String

Identificador URI de espacio de nombres del elemento.The namespace URI of the element.

value
String

Valor del elemento.The value of the element.

Excepciones

El valor localName es null o una cadena vacía.The localName value is null or an empty string.

o bien-or- Los valores de parámetro no son válidos.The parameter values are not valid.

Hay un carácter en el búfer que es un carácter XML válido pero que no es válido para la codificación de salida.There is a character in the buffer that is a valid XML character but is not valid for the output encoding. Por ejemplo, si la codificación de salida es ASCII, sólo debería utilizar los caracteres del intervalo de 0 a 127 para el elemento y nombres de atributo.For example, if the output encoding is ASCII, you should only use characters from the range of 0 to 127 for element and attribute names. El carácter no válido podría estar en el argumento de este método o en un argumento de métodos anteriores que estaban escribiendo en el búfer.The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Las referencias a entidades de caracteres anulan a dichos caracteres siempre que sea posible (por ejemplo, en nodos de texto o valores de atributo).Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). Sin embargo, la referencia de entidad de carácter no se permite en nombres de elemento y de atributo, comentarios, instrucciones de procesamiento o secciones CDATA.However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

Se llamó un método XmlWriter antes de que se termine una operación asincrónica anterior.An XmlWriter method was called before a previous asynchronous operation finished. En este caso, se genera InvalidOperationException con el mensaje “Ya hay una operación asincrónica en curso”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Comentarios

Para obtener la versión asincrónica de este método, vea WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

Se aplica a