XmlValidatingReader.IsDefault Property

Reference

Definition

Namespace:: System.Xml

Assemblies:: netstandard.dll, System.Xml.ReaderWriter.dll

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Source:: XmlValidatingReader.cs

Source:: XmlValidatingReader.cs

Source:: XmlValidatingReader.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets a value indicating whether the current node is an attribute that was generated from the default value defined in the document type definition (DTD) or schema.

public:
 virtual property bool IsDefault { bool get(); };

public override bool IsDefault { get; }

member this.IsDefault : bool

Public Overrides ReadOnly Property IsDefault As Boolean

Property Value

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.

Examples

The following example displays all attributes nodes on the root element.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   
   // Create the reader.
   XmlTextReader^ txtreader = gcnew XmlTextReader( "book4.xml" );
   XmlValidatingReader^ reader = gcnew XmlValidatingReader( txtreader );
   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();
}

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

public class Sample
{
  public static void Main(){

    //Create the reader.
    XmlTextReader txtreader = new XmlTextReader("book4.xml");
    XmlValidatingReader reader = new XmlValidatingReader(txtreader);

    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

Imports System.IO
Imports System.Xml

public class Sample 

  public shared sub Main()

    'Create the reader.
    Dim txtreader as XmlTextReader = new XmlTextReader("book4.xml")
    Dim reader as XmlValidatingReader = new XmlValidatingReader(txtreader)

    reader.MoveToContent()

    'Display each of the attribute nodes, including default attributes.
    while (reader.MoveToNextAttribute())
        if (reader.IsDefault)
          Console.Write("(default attribute) ")
        end if
        Console.WriteLine("{0} = {1}", reader.Name, reader.Value)  
    end while           
  
    'Close the reader.
    reader.Close()     
  
  end sub
end class

The example uses the following files as input.

book4.xml

XML

<!DOCTYPE book SYSTEM 'book.dtd'>
<book ISBN = '1-861001-57-5'>
  <title>Pride And Prejudice</title>
  <price>19.95</price>
</book>

book.dtd

XML

<!ELEMENT book (title,price)> 
<!ATTLIST book 
   genre CDATA "novel"
   ISBN CDATA #REQUIRED>
<!ELEMENT title (#PCDATA)>
<!ELEMENT price (#PCDATA)>

Remarks

This property applies only to an attribute node.

Anteckning

The XmlValidatingReader class is obsolete in .NET Framework 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see the Remarks section of the XmlReader reference page.

Applies to

Produkt	Versioner
.NET	Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.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	2.0, 2.1

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