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XmlNameTable Class

Table of atomized string objects.

Namespace:  System.Xml
Assemblies:   System.Xml.ReaderWriter (in System.Xml.ReaderWriter.dll)
  System.Xml (in System.Xml.dll)

public abstract class XmlNameTable

The XmlNameTable type exposes the following members.

  NameDescription
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryXmlNameTableInitializes a new instance of the XmlNameTable class.
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  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAdd(String)When overridden in a derived class, atomizes the specified string and adds it to the XmlNameTable.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryAdd(Char[], Int32, Int32)When overridden in a derived class, atomizes the specified string and adds it to the XmlNameTable.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGet(String)When overridden in a derived class, gets the atomized string containing the same value as the specified string.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGet(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.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibraryMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToStringReturns a string that represents the current object. (Inherited from Object.)
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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.

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();     

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library

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