XmlNameTable 类

定义

public ref class XmlNameTable abstract

public abstract class XmlNameTable

type XmlNameTable = class

Public MustInherit Class XmlNameTable

继承

Object

XmlNameTable

派生

System.Xml.NameTable

示例

下面的示例比较两个元素名称。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()

注解

多个类（如 XmlDocument 和 XmlReader ） XmlNameTable 在内部使用类来存储特性和元素名称。Several classes, such as XmlDocument and XmlReader, use the XmlNameTable class internally to store attribute and element names. 当 XML 文档中多次出现某个元素名或属性名时，该名称在 XmlNameTable 中只存储一次。When an element or attribute name occurs multiple times in an XML document, it is stored only once in the XmlNameTable.

这些名称存储为公共语言运行时 (CLR) 对象类型。The names are stored as common language runtime (CLR) object types. 这使您能够对这些字符串进行对象比较，而不是开销更大的字符串比较。This enables you to do object comparisons on these strings rather than a more expensive string comparison. 这些字符串对象称为 "原子化字符串"。These string objects are referred to as "atomized strings".

XmlNameTable 在类中实现 NameTable 。XmlNameTable is implemented in the NameTable class.

构造函数

方法

适用于

另请参阅

• NameTable