IndexedField<T>(DataRow,Int32,IndexingHintAction) Method

A hint to create and use an index on the specified data column. The hint has specified action.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shared Function IndexedField(Of T)( _
   ByVal row As System.Data.DataRow, _
   ByVal columnIndex As System.Integer, _
   ByVal action As IndexingHintAction _
) As T

public static T IndexedField<T>( 
   System.Data.DataRow row,
   System.int columnIndex,
   IndexingHintAction action
)

Parameters

row: The data row.
columnIndex: The zero-based ordinal position of the column.
action: The action specified by the hint.

Type Parameters

T: The type of the data column

Return Value

The data column value.

Remarks

Hints are used declaratively. They tell LiveLinq query optimizer to create and use an index on that column, if possible. When the query is executed, the hint method IndexedField is replaced with the standard LINQ to DataSet extension method Field. See C1.LiveLinq.Hints for more details.

Example

var query = from c in customersTable
    where c.IndexedField<string>(0, IndexingHintAction.Mandatory) == "ALFKI"
    select c;

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

AdoNetExtensions Class
AdoNetExtensions Members
Overload List