XmlWriter.Close Metodo

Definizione

Quando ne viene eseguito l'override in una classe derivata, chiude questo flusso e quello sottostante.When overridden in a derived class, closes this stream and the underlying stream.

public:
 virtual void Close();
public:
 abstract void Close();
public virtual void Close ();
public abstract void Close ();
abstract member Close : unit -> unit
override this.Close : unit -> unit
abstract member Close : unit -> unit
Public Overridable Sub Close ()
Public MustOverride Sub Close ()

Eccezioni

Viene eseguita una chiamata per scrivere più output in seguito alla chiamata del metodo Close o se il risultato di tale chiamata è un documento XML non valido.A call is made to write more output after Close has been called or the result of this call is an invalid XML document.

-oppure--or-

È stato chiamato un metodo della classe XmlWriter prima del completamento di un'operazione asincrona precedente.An XmlWriter method was called before a previous asynchronous operation finished. In questo caso, viene generata l'eccezione InvalidOperationException con il messaggio "È già in corso un'operazione asincrona".In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Esempio

Nell'esempio seguente viene scritto un nodo XML.The following example writes an XML node.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   
   // Create a writer to write XML to the console.
   XmlWriterSettings^ settings = gcnew XmlWriterSettings;
   settings->Indent = true;
   settings->OmitXmlDeclaration = true;
   XmlWriter^ writer = XmlWriter::Create( Console::Out, settings );
   
   // Write the book element.
   writer->WriteStartElement( L"book" );
   
   // Write the title element.
   writer->WriteStartElement( L"title" );
   writer->WriteString( L"Pride And Prejudice" );
   writer->WriteEndElement();
   
   // Write the close tag for the root element.
   writer->WriteEndElement();
   
   // Write the XML and close the writer.
   writer->Close();
   return 1;
}

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

public class Sample {

  public static void Main() {

     // Create a writer to write XML to the console.
     XmlWriterSettings settings = new XmlWriterSettings();
     settings.Indent = true;
     settings.OmitXmlDeclaration = true;
     XmlWriter writer = XmlWriter.Create(Console.Out, settings);

     // Write the book element.
     writer.WriteStartElement("book");

     // Write the title element.
     writer.WriteStartElement("title");
     writer.WriteString("Pride And Prejudice");
     writer.WriteEndElement();

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

     // Write the XML and close the writer.
     writer.Close();
  }
}
Option Explicit
Option Strict

Imports System.IO
Imports System.Xml

Public Class Sample
    
  Public Shared Sub Main()

     ' Create a writer to write XML to the console.
     Dim settings As XmlWriterSettings = new XmlWriterSettings()
     settings.Indent = true
     settings.OmitXmlDeclaration = true
     Dim writer As XmlWriter = XmlWriter.Create(Console.Out, settings)

     ' Write the book element.
     writer.WriteStartElement("book")
        
     ' Write the title element.
     writer.WriteStartElement("title")
     writer.WriteString("Pride And Prejudice")
     writer.WriteEndElement()
        
     ' Write the close tag for the root element.
     writer.WriteEndElement()
        
     ' Write the XML and close the writer.
     writer.Close()

  End Sub
End Class

Commenti

Gli elementi o gli attributi rimasti aperti vengono chiusi automaticamente.Any elements or attributes left open are automatically closed.

Nota

Quando si utilizzano i XmlWriter metodi per l'output di XML, gli elementi e gli attributi non verranno scritti finché non si chiama il Close metodo.When you use the XmlWriter methods to output XML, the elements and attributes will not be written until you call the Close method. Se ad esempio si usa XmlWriter per popolare un oggetto XmlDocument , fino a quando non si chiude XmlWriter , non sarà possibile osservare gli elementi e gli attributi scritti nel documento di destinazione.For example, if you are using the XmlWriter to populate an XmlDocument, until you close the XmlWriter, you will not be able to observe the written elements and attributes in the target document.

Si applica a