NameTable Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Implements a single-threaded XmlNameTable.
Assembly: System.Xml (in System.Xml.dll)
The NameTable type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | Add(String) | Atomizes the specified string and adds it to the NameTable. (Overrides XmlNameTable.Add(String).) |
![]() | Add(Char(), Int32, Int32) | Atomizes the specified string and adds it to the NameTable. (Overrides XmlNameTable.Add(Char(), Int32, Int32).) |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
![]() | Get(String) | Gets the atomized string with the specified value. (Overrides XmlNameTable.Get(String).) |
![]() | Get(Char(), Int32, Int32) | Gets the atomized string containing the same characters as the specified range of characters in the given array. (Overrides XmlNameTable.Get(Char(), Int32, Int32).) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
The XmlReader uses the NameTable 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 NameTable.
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 atomized strings.
Dim xmlString As String = _ "<catalog>" & _ "<book id='bk101'>" & _ "<author>Gambardella, Matthew</author>" & _ "<title>XML Developer's Guide</title>" & _ "<genre>Computer</genre>" & _ "<price>44.95</price>" & _ "<publish_date>2000-10-01</publish_date>" & _ "<description>An in-depth look at creating applications " & _ "with XML.</description>" & _ "</book>" & _ "<book id='bk102'>" & _ "<author>Ralls, Kim</author>" & _ "<title>Midnight Rain</title>" & _ "<genre>Fantasy</genre>" & _ "<price>5.95</price>" & _ "<publish_date>2000-12-16</publish_date>" & _ "<description>A former architect battles corporate zombies, " & _ "an evil sorceress, and her own childhood to become queen " & _ "of the world.</description>" & _ "</book>" & _ "</catalog>" ' 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 Using reader As XmlReader = XmlReader.Create(New StringReader(xmlString), 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 End Using

