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XmlNameTable Class

Table of atomized string objects.

Namespace: System.Xml
Assembly: System.Xml (in system.xml.dll)

Public MustInherit Class XmlNameTable
Dim instance As XmlNameTable

public abstract class XmlNameTable
public abstract class XmlNameTable

Several classes, such as XmlDocument and XmlReader, use the XmlNameTable class internally to store attribute and element names. When an element or attribute name occurs multiple times in an XML document, it is stored only once in the XmlNameTable.

The names are stored as common language runtime (CLR) object types. This enables you to do object comparisons on these strings rather than a more expensive string comparison. These string objects are referred to as atomizedstrings.

XmlNameTable is implemented in the NameTable class.

The following example compares two element names.

' 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.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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