XmlWriter.WriteElementString Método

Definição

Grava um elemento que contém um valor de cadeia de caracteres.Writes an element containing a string value.

Sobrecargas

WriteElementString(String, String)

Grava um elemento com o valor e o nome local especificados.Writes an element with the specified local name and value.

WriteElementString(String, String, String)

Grava um elemento com o nome local, URI de namespace e valor especificados.Writes an element with the specified local name, namespace URI, and value.

WriteElementString(String, String, String, String)

Grava um elemento com o prefixo, o nome local, o URI do namespace e o valor especificados.Writes an element with the specified prefix, local name, namespace URI, and value.

Comentários

Para obter a versão assíncrona desse método, consulte WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

WriteElementString(String, String)

Grava um elemento com o valor e o nome local 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)

Parâmetros

localName
String

O nome local do elemento.The local name of the element.

value
String

O valor do elemento.The value of the element.

Exceções

O valor de localName é null ou uma cadeia de caracteres vazia.The localName value is null or an empty string.

- ou --or- Os valores de parâmetros não são válidos.The parameter values are not valid.

Há um caractere no buffer que é um caractere XML válido, mas que não é válido para a codificação de saída.There is a character in the buffer that is a valid XML character but is not valid for the output encoding. Por exemplo, se a codificação de saída for ASCII, use apenas caracteres no intervalo de 0 a 127 para nomes de elemento e 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. O caractere inválido pode estar no argumento do método ou em um argumento dos métodos anteriores que foram gravados no buffer.The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Esses caracteres são substituídos por referências de entidade de caracteres de escape quando possível (por exemplo, em nós de texto ou valores de atributo).Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). No entanto, a referência de entidade de caracteres não é permitida em nomes de elemento e de atributo, comentários, instruções de processamento ou seções de CDATA.However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

Um método XmlWriter foi chamado antes do término de uma operação assíncrona anterior.An XmlWriter method was called before a previous asynchronous operation finished. Nesse caso, InvalidOperationException será gerado com a mensagem “Uma operação assíncrona já está em andamento”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Exemplos

O exemplo a seguir usa vários métodos de gravação para criar um 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

Comentários

Para obter a versão assíncrona desse método, consulte WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

Aplica-se a

WriteElementString(String, String, String)

Grava um elemento com o nome local, URI de namespace e valor especificados.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)

Parâmetros

localName
String

O nome local do elemento.The local name of the element.

ns
String

O URI do namespace a ser associado ao elemento.The namespace URI to associate with the element.

value
String

O valor do elemento.The value of the element.

Exceções

O valor de localName é null ou uma cadeia de caracteres vazia.The localName value is null or an empty string.

- ou --or- Os valores de parâmetros não são válidos.The parameter values are not valid.

Há um caractere no buffer que é um caractere XML válido, mas que não é válido para a codificação de saída.There is a character in the buffer that is a valid XML character but is not valid for the output encoding. Por exemplo, se a codificação de saída for ASCII, use apenas caracteres no intervalo de 0 a 127 para nomes de elemento e 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. O caractere inválido pode estar no argumento do método ou em um argumento dos métodos anteriores que foram gravados no buffer.The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Esses caracteres são substituídos por referências de entidade de caracteres de escape quando possível (por exemplo, em nós de texto ou valores de atributo).Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). No entanto, a referência de entidade de caracteres não é permitida em nomes de elemento e de atributo, comentários, instruções de processamento ou seções de CDATA.However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

Um método XmlWriter foi chamado antes do término de uma operação assíncrona anterior.An XmlWriter method was called before a previous asynchronous operation finished. Nesse caso, InvalidOperationException será gerado com a mensagem “Uma operação assíncrona já está em andamento”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Exemplos

O exemplo a seguir usa vários métodos de gravação para criar um 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

Comentários

Para obter a versão assíncrona desse método, consulte WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

Aplica-se a

WriteElementString(String, String, String, String)

Grava um elemento com o prefixo, o nome local, o URI do namespace e o 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)

Parâmetros

prefix
String

O prefixo do elemento.The prefix of the element.

localName
String

O nome local do elemento.The local name of the element.

ns
String

O URI do namespace do elemento.The namespace URI of the element.

value
String

O valor do elemento.The value of the element.

Exceções

O valor de localName é null ou uma cadeia de caracteres vazia.The localName value is null or an empty string.

- ou --or- Os valores de parâmetros não são válidos.The parameter values are not valid.

Há um caractere no buffer que é um caractere XML válido, mas que não é válido para a codificação de saída.There is a character in the buffer that is a valid XML character but is not valid for the output encoding. Por exemplo, se a codificação de saída for ASCII, use apenas caracteres no intervalo de 0 a 127 para nomes de elemento e 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. O caractere inválido pode estar no argumento do método ou em um argumento dos métodos anteriores que foram gravados no buffer.The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer. Esses caracteres são substituídos por referências de entidade de caracteres de escape quando possível (por exemplo, em nós de texto ou valores de atributo).Such characters are escaped by character entity references when possible (for example, in text nodes or attribute values). No entanto, a referência de entidade de caracteres não é permitida em nomes de elemento e de atributo, comentários, instruções de processamento ou seções de CDATA.However, the character entity reference is not allowed in element and attribute names, comments, processing instructions, or CDATA sections.

Um método XmlWriter foi chamado antes do término de uma operação assíncrona anterior.An XmlWriter method was called before a previous asynchronous operation finished. Nesse caso, InvalidOperationException será gerado com a mensagem “Uma operação assíncrona já está em andamento”.In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Comentários

Para obter a versão assíncrona desse método, consulte WriteElementStringAsync .For the asynchronous version of this method, see WriteElementStringAsync.

Aplica-se a