XmlValidatingReader.MoveToAttribute Metodo

Origine:

XmlValidatingReader.cs

Origine:

XmlValidatingReader.cs

Origine:

XmlValidatingReader.cs

public:
 override void MoveToAttribute(int i);

public override void MoveToAttribute (int i);

override this.MoveToAttribute : int -> unit

Public Overrides Sub MoveToAttribute (i As Integer)

Parametri

Eccezioni

Esempio

Nell'esempio seguente vengono letti tutti gli elementi nel nodo radice.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlValidatingReader^ reader = nullptr;
   try
   {
      
      //Create the string to parse.
      String^ xmlFrag = "<book genre='novel' ISBN='1-861003-78' pubdate='1987'></book> ";
      
      //Create the XmlNamespaceManager.
      NameTable^ nt = gcnew NameTable;
      XmlNamespaceManager^ nsmgr = gcnew XmlNamespaceManager( nt );
      
      //Create the XmlParserContext.
      XmlParserContext^ context = gcnew XmlParserContext( nullptr,nsmgr,nullptr,XmlSpace::None );
      
      //Create the XmlValidatingReader .
      reader = gcnew XmlValidatingReader( xmlFrag,XmlNodeType::Element,context );
      
      //Read the attributes on the root element.
      reader->MoveToContent();
      if ( reader->HasAttributes )
      {
         for ( int i = 0; i < reader->AttributeCount; i++ )
         {
            reader->MoveToAttribute( i );
            Console::WriteLine( "{0} = {1}", reader->Name, reader->Value );

         }
         reader->MoveToElement();
      }
   }
   finally
   {
      if ( reader != nullptr )
            reader->Close();
   }

}

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

public class Sample
{
  public static void Main()
  {
    XmlValidatingReader reader = null;

    try
    {
       //Create the string to parse.
       string xmlFrag="<book genre='novel' ISBN='1-861003-78' pubdate='1987'></book> ";

       //Create the XmlNamespaceManager.
       NameTable nt = new NameTable();
       XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);

       //Create the XmlParserContext.
       XmlParserContext context = new XmlParserContext(null, nsmgr, null, XmlSpace.None);

       //Create the XmlValidatingReader .
       reader = new XmlValidatingReader(xmlFrag, XmlNodeType.Element, context);

       //Read the attributes on the root element.
       reader.MoveToContent();
       if (reader.HasAttributes){
         for (int i=0; i<reader.AttributeCount; i++){
            reader.MoveToAttribute(i);
            Console.WriteLine("{0} = {1}", reader.Name, reader.Value);
         }
         //Move the reader back to the node that owns the attribute.
         reader.MoveToElement();
       }
     }

     finally
     {
        if (reader != null)
          reader.Close();
      }
  }
} // End class

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    
    Public Shared Sub Main()
        Dim reader As XmlValidatingReader = Nothing
        
        Try
            'Create the string to parse.
            Dim xmlFrag As String = "<book genre='novel' ISBN='1-861003-78' pubdate='1987'></book> "
            
            'Create the XmlNamespaceManager.
            Dim nt As New NameTable()
            Dim nsmgr As New XmlNamespaceManager(nt)
            
            'Create the XmlParserContext.
            Dim context As New XmlParserContext(Nothing, nsmgr, Nothing, XmlSpace.None)
            
            'Create the XmlValidatingReader .
            reader = New XmlValidatingReader(xmlFrag, XmlNodeType.Element, context)
            
            'Read the attributes on the root element.
            reader.MoveToContent()
            If reader.HasAttributes Then
                Dim i As Integer
                For i = 0 To reader.AttributeCount - 1
                    reader.MoveToAttribute(i)
                    Console.WriteLine("{0} = {1}", reader.Name, reader.Value)
                Next i
                'Move the reader back to the node that owns the attribute.
                reader.MoveToElement()
            End If
        
        
        Finally
            If Not (reader Is Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub
End Class

Commenti

Vedi anche

• XmlReader

Origine:

XmlValidatingReader.cs

Origine:

XmlValidatingReader.cs

Origine:

XmlValidatingReader.cs

public:
 override bool MoveToAttribute(System::String ^ name);

public override bool MoveToAttribute (string name);

override this.MoveToAttribute : string -> bool

Public Overrides Function MoveToAttribute (name As String) As Boolean

Parametri

Restituisce

true se l'attributo viene trovato; in caso contrario, false. Se false, la posizione del lettore non subisce alcuna modifica.

Esempio

Nell'esempio seguente viene letto un attributo con nodi di riferimento di testo ed entità.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlValidatingReader^ reader = nullptr;
   try
   {
      
      //Create the XML fragment to be parsed.
      String^ xmlFrag = "<book genre='novel' misc='sale-item &h; 1987'></book>";
      
      //Create the XmlParserContext.
      XmlParserContext^ context;
      String^ subset = "<!ENTITY h 'hardcover'>";
      context = gcnew XmlParserContext( nullptr,nullptr,"book",nullptr,nullptr,subset,"","",XmlSpace::None );
      
      //Create the reader and set it to not expand general entities. 
      reader = gcnew XmlValidatingReader( xmlFrag,XmlNodeType::Element,context );
      reader->ValidationType = ValidationType::None;
      reader->EntityHandling = EntityHandling::ExpandCharEntities;
      
      //Read the misc attribute. Because EntityHandling is set to
      //ExpandCharEntities, the attribute is parsed into multiple text
      //and entity reference nodes.
      reader->MoveToContent();
      reader->MoveToAttribute( "misc" );
      while ( reader->ReadAttributeValue() )
      {
         if ( reader->NodeType == XmlNodeType::EntityReference )
                  
         //To expand the entity, call ResolveEntity.
         Console::WriteLine( "{0} {1}", reader->NodeType, reader->Name );
         else
                  Console::WriteLine( "{0} {1}", reader->NodeType, reader->Value );
      }
   }
   finally
   {
      if ( reader != nullptr )
            reader->Close();
   }

}

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

public class Sample
{
  public static void Main()
  {
    XmlValidatingReader reader = null;

    try
    {
       //Create the XML fragment to be parsed.
       string xmlFrag ="<book genre='novel' misc='sale-item &h; 1987'></book>";

       //Create the XmlParserContext.
       XmlParserContext context;
       string subset = "<!ENTITY h 'hardcover'>";
       context = new XmlParserContext(null, null, "book", null, null, subset, "", "", XmlSpace.None);

       //Create the reader and set it to not expand general entities.
       reader = new XmlValidatingReader(xmlFrag, XmlNodeType.Element, context);
       reader.ValidationType = ValidationType.None;
       reader.EntityHandling = EntityHandling.ExpandCharEntities;

       //Read the misc attribute. Because EntityHandling is set to
       //ExpandCharEntities, the attribute is parsed into multiple text
       //and entity reference nodes.
       reader.MoveToContent();
       reader.MoveToAttribute("misc");
       while (reader.ReadAttributeValue()){
          if (reader.NodeType==XmlNodeType.EntityReference)
            //To expand the entity, call ResolveEntity.
            Console.WriteLine("{0} {1}", reader.NodeType, reader.Name);
          else
             Console.WriteLine("{0} {1}", reader.NodeType, reader.Value);
        }
     }
     finally
     {
        if (reader != null)
          reader.Close();
      }
  }
} // End class

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    
    Public Shared Sub Main()
        Dim reader As XmlValidatingReader = Nothing
        
        Try
            'Create the XML fragment to be parsed.
            Dim xmlFrag As String = "<book genre='novel' misc='sale-item &h; 1987'></book>"
            
            'Create the XmlParserContext.
            Dim context As XmlParserContext
            Dim subset As String = "<!ENTITY h 'hardcover'>"
            context = New XmlParserContext(Nothing, Nothing, "book", Nothing, Nothing, subset, "", "", XmlSpace.None)
            
            'Create the reader and set it to not expand general entities. 
            reader = New XmlValidatingReader(xmlFrag, XmlNodeType.Element, context)
            reader.ValidationType = ValidationType.None
            reader.EntityHandling = EntityHandling.ExpandCharEntities
            
            'Read the misc attribute. Because EntityHandling is set to
            'ExpandCharEntities, the attribute is parsed into multiple text
            'and entity reference nodes.
            reader.MoveToContent()
            reader.MoveToAttribute("misc")
            While reader.ReadAttributeValue()
                If reader.NodeType = XmlNodeType.EntityReference Then
                    'To expand the entity, call ResolveEntity.
                    Console.WriteLine("{0} {1}", reader.NodeType, reader.Name)
                Else
                    Console.WriteLine("{0} {1}", reader.NodeType, reader.Value)
                End If
            End While
        Finally
            If Not (reader Is Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub
End Class

Commenti

Dopo aver chiamato questo metodo, le Nameproprietà , NamespaceURIe Prefix riflettono le proprietà di tale attributo.

Vedi anche

• XmlReader

Origine:

XmlValidatingReader.cs

Origine:

XmlValidatingReader.cs

Origine:

XmlValidatingReader.cs

public:
 override bool MoveToAttribute(System::String ^ localName, System::String ^ namespaceURI);

public override bool MoveToAttribute (string localName, string? namespaceURI);

public override bool MoveToAttribute (string localName, string namespaceURI);

override this.MoveToAttribute : string * string -> bool

Public Overrides Function MoveToAttribute (localName As String, namespaceURI As String) As Boolean

Parametri

Restituisce

true se l'attributo viene trovato; in caso contrario, false. Se false, la posizione del lettore non subisce alcuna modifica.

Commenti

Dopo aver chiamato questo metodo, le Nameproprietà , NamespaceURIe Prefix riflettono le proprietà di tale attributo.

Vedi anche

• XmlReader