XmlNameTable Class

Definition

Namespace:

System.Xml

Assembly:

System.Xml.ReaderWriter.dll

Table of atomized string objects.

public ref class XmlNameTable abstract

public abstract class XmlNameTable

type XmlNameTable = class

Public MustInherit Class XmlNameTable

Inheritance

Object

XmlNameTable

Derived

System.Xml.NameTable

Examples

The following example compares two element names.

// 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()

Remarks

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 "atomized strings".

XmlNameTable is implemented in the NameTable class.

Constructors

XmlNameTable()

Initializes a new instance of the XmlNameTable class.

Methods

Add(Char[], Int32, Int32)	When overridden in a derived class, atomizes the specified string and adds it to the XmlNameTable.
Add(String)	When overridden in a derived class, atomizes the specified string and adds it to the XmlNameTable.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
Get(Char[], Int32, Int32)	When overridden in a derived class, gets the atomized string containing the same characters as the specified range of characters in the given array.
Get(String)	When overridden in a derived class, gets the atomized string containing the same value as the specified string.
GetHashCode()	Serves as the default hash function. (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)

See also

• NameTable