XmlTextReader.GetRemainder Metodo

Definizione

Ottiene la parte restante del codice XML memorizzato nel buffer.Gets the remainder of the buffered XML.

public:
 System::IO::TextReader ^ GetRemainder();
public System.IO.TextReader GetRemainder ();
member this.GetRemainder : unit -> System.IO.TextReader
Public Function GetRemainder () As TextReader

Restituisce

Oggetto TextReader che contiene la parte rimanente del codice XML memorizzato nel buffer.A TextReader containing the remainder of the buffered XML.

Esempio

Nell'esempio seguente viene letta la prima parte di un documento XML e quindi viene utilizzato GetRemainder per completare la lettura del documento utilizzando un secondo Reader.The following example reads the first part of an XML document and then uses GetRemainder to complete reading the document using a second reader.

#using <System.Xml.dll>

using namespace System;
using namespace System::Xml;
int main()
{
   String^ filename = "tworeads.xml";
   XmlTextReader^ reader = gcnew XmlTextReader( filename );
   reader->WhitespaceHandling = WhitespaceHandling::None;
   
   // Read the first part of the XML document
   while ( reader->Read() )
   {
      
      // Display the elements and stop reading on the book endelement tag
      // then go to ReadPart2 to start another reader to read the rest of the file. 
      switch ( reader->NodeType )
      {
         case XmlNodeType::Element:
            Console::WriteLine( "Name: {0}", reader->Name );
            break;

         case XmlNodeType::Text:
            Console::WriteLine( "  Element Text: {0}", reader->Value );
            break;

         case XmlNodeType::EndElement:
            
            // Stop reading when the reader gets to the end element of the book node.
            if ( "book" == reader->LocalName )
            {
               Console::WriteLine( "End reading first book..." );
               Console::WriteLine();
               goto ReadPart2;
            }
            break;
      }
   }

   
   // Read the rest of the XML document
   
ReadPart2:
   Console::WriteLine( "Begin reading second book..." );
   
   // Create a new reader to read the rest of the document.
   XmlTextReader^ reader2 = gcnew XmlTextReader( reader->GetRemainder() );
   while ( reader2->Read() )
   {
      switch ( reader2->NodeType )
      {
         case XmlNodeType::Element:
            Console::WriteLine( "Name: {0}", reader2->Name );
            break;

         case XmlNodeType::Text:
            Console::WriteLine( "  Element Text: {0}", reader2->Value );
            break;

         case XmlNodeType::EndElement:
            
            // Stop reading when the reader gets to the end element of the book node.
            if ( "book" == reader2->LocalName )
            {
               Console::WriteLine( "End reading second book..." );
               goto Done;
            }
            break;
      }
   }

   
Done:
   Console::WriteLine( "Done." );
   reader->Close();
   reader2->Close();
}

using System;
using System.Xml; 

public class Sample {

  private static string filename = "tworeads.xml";
   
  public static void Main() {
  
    XmlTextReader reader = new XmlTextReader(filename);
    reader.WhitespaceHandling=WhitespaceHandling.None;

    // Read the first part of the XML document
    while(reader.Read()) {
      // Display the elements and stop reading on the book endelement tag
      // then go to ReadPart2 to start another reader to read the rest of the file. 
      switch(reader.NodeType) {
       case XmlNodeType.Element:
        Console.WriteLine("Name: {0}", reader.Name);
        break;
       case XmlNodeType.Text:
        Console.WriteLine("  Element Text: {0}", reader.Value);
        break;
       case XmlNodeType.EndElement:
        // Stop reading when the reader gets to the end element of the book node.
        if ("book"==reader.LocalName) {
          Console.WriteLine("End reading first book...");
          Console.WriteLine();      
          goto ReadPart2;
        }
        break;
      } 
    } 

    // Read the rest of the XML document
    ReadPart2:
    Console.WriteLine("Begin reading second book...");

    // Create a new reader to read the rest of the document.
    XmlTextReader reader2 = new XmlTextReader(reader.GetRemainder());

    while(reader2.Read()) {
      switch (reader2.NodeType) {
        case XmlNodeType.Element:
         Console.WriteLine("Name: {0}", reader2.Name);
         break;
        case XmlNodeType.Text:
         Console.WriteLine("  Element Text: {0}", reader2.Value);
         break;
        case XmlNodeType.EndElement:
         // Stop reading when the reader gets to the end element of the book node.
         if ("book"==reader2.LocalName) {
           Console.WriteLine("End reading second book...");
           goto Done;
         }
         break;
      }
    }

    Done:
    Console.WriteLine("Done.");
    reader.Close(); 
    reader2.Close();
  }
}//End class
Imports System.Xml

Public Class Sample
    Private Shared filename As String = "tworeads.xml"
    
    Public Shared Sub Main()

        Dim reader As New XmlTextReader(filename)
        reader.WhitespaceHandling = WhitespaceHandling.None
        
        ' Read the first part of the XML document
        While reader.Read()
            ' Display the elements and stop reading on the book endelement tag
            ' then go to ReadPart2 to start another reader to read the rest of the file. 
            Select Case reader.NodeType
                Case XmlNodeType.Element
                    Console.WriteLine("Name: {0}", reader.Name)
                Case XmlNodeType.Text
                    Console.WriteLine("  Element Text: {0}", reader.Value)
                Case XmlNodeType.EndElement
                    ' Stop reading when the reader gets to the end element of the book node.
                    If "book" = reader.LocalName Then
                        Console.WriteLine("End reading first book...")
                        Console.WriteLine()
                        GoTo ReadPart2
                    End If
            End Select
        End While
        
        ' Read the rest of the XML document
        ReadPart2: 
        Console.WriteLine("Begin reading second book...")
        
        ' Create a new reader to read the rest of the document.
        Dim reader2 As New XmlTextReader(reader.GetRemainder())
        
        While reader2.Read()
            Select Case reader2.NodeType
                Case XmlNodeType.Element
                    Console.WriteLine("Name: {0}", reader2.Name)
                Case XmlNodeType.Text
                    Console.WriteLine("  Element Text: {0}", reader2.Value)
                Case XmlNodeType.EndElement
                    'Stop reading when the reader gets to the end element of the book node.
                    If "book" = reader2.LocalName Then
                        Console.WriteLine("End reading second book...")
                        GoTo Done
                    End If
            End Select
        End While
        
        Done: 
        Console.WriteLine("Done.")
        reader.Close()
        reader2.Close()
    End Sub
End Class

Nell'esempio viene usato il file di input tworeads.xml.The example uses the input file tworeads.xml.

<?xml version="1.0" ?>
<bookstore>
 <book>
  <title>Pride And Prejudice</title>
  <author>Jane Austen</author>
 </book>
 <book>
  <title>The Handmaid's Tale</title>
  <author>Margaret Atwood</author>
 </book>
</bookstore>

Commenti

Nota

A partire dalla .NET Framework 2,0, è consigliabile creare istanze di XmlReader usando il metodo XmlReader.Create per sfruttare le nuove funzionalità.Starting with the .NET Framework 2.0, we recommend that you create XmlReader instances by using the XmlReader.Create method to take advantage of new functionality.

Poiché XmlTextReader esegue un Readmemorizzato nel buffer, deve essere in grado di restituire il resto del buffer inutilizzato in modo che non venga perso alcun dato.Because XmlTextReader does a buffered Read, it must be able to return the remainder of the unused buffer so that no data is lost. Questo consente ai protocolli (ad esempio MIME multiparte) di creare un pacchetto XML nello stesso flusso di altri elementi.This allows protocols (such as multi-part MIME) to package XML in the same stream as other things.

Dopo la chiamata a questo metodo, EOF viene impostato su true.After calling this method, EOF is set to true.

Si applica a

Vedi anche