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

In This Topic

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 DataRow, _
   ByVal column As DataColumn, _
   ByVal action As IndexingHintAction _
) As T

public static T IndexedField<T>( 
   DataRow row,
   DataColumn column,
   IndexingHintAction action
)

Parameters

row: The data row.
column: The data 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>(customerColumn, IndexingHintAction.Mandatory) == "ALFKI"
    select c;

Reference

AdoNetExtensions Class
AdoNetExtensions Members
Overload List