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)

public virtual bool IsDefault { get; }

Property Value

Type: System.Boolean
true 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.

IsDefault always returns false for implementations of XmlReader that do not support schema or DTD information. This property applies only to an attribute node.

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)>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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