WriteAttributes Method
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XmlWriter.WriteAttributes Method (XmlReader, Boolean)


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

Namespace:   System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public virtual void WriteAttributes(
	XmlReader reader,
	bool defattr


Type: System.Xml.XmlReader

The XmlReader from which to copy the attributes.

Type: System.Boolean

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

Exception Condition

reader is null.


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


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.”

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.

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;
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.WriteAttributes(reader, false);
        if (reader.IsEmptyElement) writer.WriteEndElement();
      else if (reader.NodeType == XmlNodeType.EndElement) {

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

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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