XmlReader.IsDefault Property
Important
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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.
public:
virtual property bool IsDefault { bool get(); };
public:
abstract property bool IsDefault { bool get(); };
public virtual bool IsDefault { get; }
public abstract bool IsDefault { get; }
member this.IsDefault : bool
Public Overridable ReadOnly Property IsDefault As Boolean
Public MustOverride ReadOnly Property IsDefault As 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.
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)>
IsDefault
always returns false
for implementations of XmlReader
that do not support schema or DTD information. This property applies only to an attribute node.
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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