XmlDocumentType.IsReadOnly 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:: XmlDocumentType.cs

Source:: XmlDocumentType.cs

Source:: XmlDocumentType.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 node is read-only.

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

public override bool IsReadOnly { get; }

member this.IsReadOnly : bool

Public Overrides ReadOnly Property IsReadOnly As Boolean

Property Value

Boolean

true if the node is read-only; otherwise, false.

Because DocumentType nodes are read-only, this property always returns true.

Examples

The following example displays information about the DocumentType node.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   
   // Create the XmlDocument.
   XmlDocument^ doc = gcnew XmlDocument;
   doc->LoadXml( "<!DOCTYPE book [<!ENTITY h 'hardcover'>]>"
   "<book genre='novel' ISBN='1-861001-57-5'>"
   "<title>Pride And Prejudice</title>"
   "<style>&h;</style>"
   "</book>" );
   
   // Check if the node is read-only.
   if ( doc->DocumentType->IsReadOnly )
      Console::WriteLine( "Document type nodes are always read-only" );
}

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

public class Sample
{
  public static void Main()
  {
    // Create the XmlDocument.
    XmlDocument doc = new XmlDocument();
    doc.LoadXml("<!DOCTYPE book [<!ENTITY h 'hardcover'>]>" +
                "<book genre='novel' ISBN='1-861001-57-5'>" +
                "<title>Pride And Prejudice</title>" +
                "<style>&h;</style>" +
                "</book>");

    // Determine whether the node is read-only.
    if (doc.DocumentType.IsReadOnly)
       Console.WriteLine("Document type nodes are always read-only");
  }
}

Option Explicit
Option Strict

Imports System.IO
Imports System.Xml

Public Class Sample
    
    Public Shared Sub Main()
        ' Create the XmlDocument.
        Dim doc As New XmlDocument()
        doc.LoadXml("<!DOCTYPE book [<!ENTITY h 'hardcover'>]>" & _
                    "<book genre='novel' ISBN='1-861001-57-5'>" & _
                    "<title>Pride And Prejudice</title>" & _
                    "<style>&h;</style>" & _
                    "</book>")
        
        Dim doctype As XmlDocumentType = doc.DocumentType
        
        ' Determine whether the node is read-only.
        If doctype.IsReadOnly Then
            Console.WriteLine("Document type nodes are always read-only")
        End If 
    End Sub
End Class

Remarks

A read-only node is one whose properties, attributes, or children cannot be changed. However, you can remove a read-only node from the tree and insert it somewhere else.

You can remove a XmlDocumentType from a document and reinsert it back into the document as long as the document does not have an element node. Once a document has a root element, its XmlDocumentType cannot be changed.

This property is a Microsoft extension to the Document Object Model (DOM).

Applies to

Продукт	Версии
.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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