XmlWriter.WriteAttributes(XmlReader, Boolean) Method

Definition

Namespace:

System.Xml

Assembly:

System.Xml.ReaderWriter.dll

Source:

XmlWriter.cs

When overridden in a derived class, writes out all the attributes found at the current position in the XmlReader.

public:
 virtual void WriteAttributes(System::Xml::XmlReader ^ reader, bool defattr);

public virtual void WriteAttributes (System.Xml.XmlReader reader, bool defattr);

abstract member WriteAttributes : System.Xml.XmlReader * bool -> unit
override this.WriteAttributes : System.Xml.XmlReader * bool -> unit

Public Overridable Sub WriteAttributes (reader As XmlReader, defattr As Boolean)

Parameters

reader

XmlReader

The XmlReader from which to copy the attributes.

defattr

Boolean

true to copy the default attributes from the XmlReader; otherwise, false.

Exceptions

ArgumentNullException

reader is null.

XmlException

The reader is not positioned on an element, attribute or XmlDeclaration node.

InvalidOperationException

An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Examples

The following example copies all the elements to the output, changes the tag names to upper case, and copies all the attributes unchanged.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
void main()
{
   XmlReader^ reader = XmlReader::Create( L"test1.xml" );
   XmlWriterSettings^ settings = gcnew XmlWriterSettings;
   settings->Indent = true;
   XmlWriter^ writer = XmlWriter::Create( Console::Out );
   while ( reader->Read() )
   {
      if ( reader->NodeType == XmlNodeType::Element )
      {
         writer->WriteStartElement( reader->Name->ToUpper() );
         writer->WriteAttributes( reader, false );
         if ( reader->IsEmptyElement )
                  writer->WriteEndElement();
      }
      else
      if ( reader->NodeType == XmlNodeType::EndElement )
      {
         writer->WriteEndElement();
      }
   }

   writer->Close();
   reader->Close();
}

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

public class Sample {

  public static void Main() {

    XmlReader reader = XmlReader.Create("test1.xml");
    XmlWriterSettings settings = new XmlWriterSettings();
    settings.Indent = true;
    XmlWriter writer = XmlWriter.Create(Console.Out);

    while (reader.Read()) {
      if (reader.NodeType == XmlNodeType.Element) {
        writer.WriteStartElement(reader.Name.ToUpper());
        writer.WriteAttributes(reader, false);
        if (reader.IsEmptyElement) writer.WriteEndElement();
      }
      else if (reader.NodeType == XmlNodeType.EndElement) {
        writer.WriteEndElement();
      }
    }
    writer.Close();
    reader.Close();
  }
}

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    
  Public Shared Sub Main()

    Dim reader As XmlReader = XmlReader.Create("test1.xml")
    Dim settings As XmlWriterSettings = new XmlWriterSettings()
    settings.Indent = true
    Dim writer As XmlWriter = XmlWriter.Create(Console.Out)
        
      While reader.Read()
          If reader.NodeType = XmlNodeType.Element Then
              writer.WriteStartElement(reader.Name.ToUpper())
              writer.WriteAttributes(reader, False)
              If reader.IsEmptyElement Then
                 writer.WriteEndElement()
              End If
          Else
              If reader.NodeType = XmlNodeType.EndElement Then
                  writer.WriteEndElement()
              End If
          End If
      End While
      writer.Close()
      reader.Close()

    End Sub
End Class

The example uses the file, test1.xml, as input.

<test a="1" b="2">
    <item c="3" d="4" e="5" f="6"/>
</test>

Remarks

If the reader is positioned on an element node WriteAttributes copies all the contained attributes. If the reader is positioned on an attribute node, this method writes the current attribute, then the rest of the attributes until the element closing tag. If the reader is positioned on an XmlDeclaration node, this method writes all the attributes in the declaration. If the reader is positioned on any other node type this method throws an XmlException.

If this method is called using XmlValidatingReader, to ensure well-formed XML any content (which has been expanded from the entities) that could result in an invalid document is replaced when written. For example, if an attribute includes an > entity that has been expanded, to ensure a well-formed document the expanded > is replaced when written out with >.

For the asynchronous version of this method, see WriteAttributesAsync.