XmlNameTable Classe

Definizione

public ref class XmlNameTable abstract

public abstract class XmlNameTable

type XmlNameTable = class

Public MustInherit Class XmlNameTable

Ereditarietà

Object

XmlNameTable

Derivato

System.Xml.NameTable

Esempio

Nell'esempio seguente vengono confrontati due nomi di elemento.

// Add the element names to the NameTable.
NameTable nt = new NameTable();
object book = nt.Add("book");
object title = nt.Add("title");

 // Create a reader that uses the NameTable.
 XmlReaderSettings settings = new XmlReaderSettings();
 settings.NameTable = nt;
 XmlReader reader = XmlReader.Create("books.xml", settings);

 while (reader.Read()) {
    if (reader.NodeType == XmlNodeType.Element) {
      // Cache the local name to prevent multiple calls to the LocalName property.
      object localname = reader.LocalName;

      // Do a comparison between the object references. This just compares pointers.
      if (book == localname) {
          // Add additional processing here.
      }
      // Do a comparison between the object references. This just compares pointers.
      if (title == localname) {
         // Add additional processing here.
      }
    }
 }  // End While

// Close the reader.
reader.Close();

' Add the element names to the NameTable.
Dim nt As New NameTable()
Dim book As Object = nt.Add("book")
Dim title As Object = nt.Add("title")

' Create a reader that uses the NameTable.
Dim settings As New XmlReaderSettings()
settings.NameTable = nt
Dim reader As XmlReader = XmlReader.Create("books.xml", settings)

While reader.Read()
    If reader.NodeType = XmlNodeType.Element Then
        ' Cache the local name to prevent multiple calls to the LocalName property.
        Dim localname As Object = reader.LocalName
        
        ' Do a comparison between the object references. This just compares pointers.
        If book Is localname Then
           ' Add additional processing here.
        End If 
        ' Do a comparison between the object references. This just compares pointers.
        If title Is localname Then
           ' Add additional processing here.
        End If 
    End If
End While 

' Close the reader.
reader.Close()

Commenti

Diverse classi, ad esempio XmlDocument e XmlReader, usano internamente la XmlNameTable classe per archiviare i nomi degli attributi e degli elementi. Quando un nome di elemento o attributo si verifica più volte in un documento XML, viene archiviato una sola volta in XmlNameTable.

I nomi vengono archiviati come tipi di oggetto CLR (Common Language Runtime). In questo modo è possibile eseguire confronti di oggetti su queste stringhe anziché un confronto di stringhe più costoso. Questi oggetti stringa vengono definiti "stringhe atomizzate".

XmlNameTable viene implementato nella NameTable classe .

Vedi anche

• NameTable