XmlDocumentType.IsReadOnly 属性

定义

命名空间:

System.Xml

程序集:

System.Xml.ReaderWriter.dll

程序集:

System.Xml.dll

程序集:

netstandard.dll

获取指示节点是否只读的值。

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

public override bool IsReadOnly { get; }

member this.IsReadOnly : bool

Public Overrides ReadOnly Property IsReadOnly As Boolean

属性值

Boolean

true 如果节点为只读，则为否则，为 false.

由于 DocumentType 节点是只读的，所以此属性总是返回 true。

示例

以下示例显示有关 DocumentType 节点的信息。

#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

注解

只读节点是不能更改其属性、属性或子节点的节点。 但是，可以从树中删除只读节点并将其插入到其他位置。

只要文档没有元素节点，就可以从文档中删除该 XmlDocumentType 文档并将其重新插入到文档中。 文档具有根元素后，无法更改它 XmlDocumentType 。

此属性是文档对象模型 (DOM) 的 Microsoft 扩展。