IndexedAttribute(XElement,XName,IndexingHintAction) Method

In This Topic

A hint to create and use an index on the specified XML attribute. The hint has specified action.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shared Function IndexedAttribute( _
   ByVal element As XElement, _
   ByVal name As XName, _
   ByVal action As IndexingHintAction _
) As XHint

public static XHint IndexedAttribute( 
   XElement element,
   XName name,
   IndexingHintAction action
)

Parameters

element: The element containing the attribute.
name: The name of the attribute to get.
action: The action specified by the hint.

Return Value

The attribute that has the specified name.

Remarks

Hints are used declaratively. They tell LiveLinq query optimizer to create and use an index on this attribute, if possible. When the query is executed, the hint method IndexedAttribute is replaced with the standard LINQ to XML method System.Xml.Linq.XElement.Attribute(System.Xml.Linq.XName). See C1.LiveLinq.Hints for more details.

Example

var query =
    from c in customers
    where (string)c.IndexedAttribute("CustomerID", IndexingHintAction.Mandatory) == "ALFKI"
    select c;

Reference

XmlExtensions Class
XmlExtensions Members
Overload List