XmlReader.IsDefault Property
When overridden in a derived class, gets a value indicating whether the current node is an attribute that was generated from the default value defined in the DTD or schema.
Namespace: System.Xml
Assembly: System.Xml (in System.Xml.dll)
Property Value
Type: System.Booleantrue if the current node is an attribute whose value was generated from the default value defined in the DTD or schema; false if the attribute value was explicitly set.
| Exception | Condition |
|---|---|
| InvalidOperationException | An XmlReader 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.” |
The following example displays all attributes on the root element.
using System;
using System.IO;
using System.Xml;
public class Sample
{
public static void Main(){
// Create the reader.
XmlReader reader = XmlReader.Create("book4.xml");
reader.MoveToContent();
// Display each of the attribute nodes, including default attributes.
while (reader.MoveToNextAttribute()){
if (reader.IsDefault)
Console.Write("(default attribute) ");
Console.WriteLine("{0} = {1}", reader.Name, reader.Value);
}
//Close the reader.
reader.Close();
}
} // End class
The example uses the following files as input.
book4.xml
<!DOCTYPE book SYSTEM 'book.dtd'> <book ISBN = '1-861001-57-5'> <title>Pride And Prejudice</title> <price>19.95</price> </book>
book.dtd
<!ELEMENT book (title,price)> <!ATTLIST book genre CDATA "novel" ISBN CDATA #REQUIRED> <!ELEMENT title (#PCDATA)> <!ELEMENT price (#PCDATA)>
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
