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View this topic on docs.devexpress.com (Learn more)

ConstantValue Class

A constant value operand in criteria expressions.

Namespace:DevExpress.Data.Filtering
Assembly:DevExpress.Data.v19.2.dll

Expanded Syntax

Expanded Remarks

Normally, criteria value operands (OperandValue objects) are automatically passed as standard parameters to the resulting SQL queries, generated based on criteria expressions. The ConstantValue allows you to embed in-line parameters into the resulting SQL queries. With in-line parameters, you can improve performance when executing a number of SQL queries with matching constants passed as parameters. To accomplish this, replace OperandValue with ConstantValue in your criteria expression as shown below.

Expanded Examples

The CriteriaOperator.Parse method automatically translates constant operand values to ConstantValue counterparts. So, the following line produces the same criteria.

If you pass constant operand values using positional parameters (see the corresponding section in Criteria Language Syntax), they are translated, as usual, to OperandValue objects, not ConstantValue objects. The following code will produce criteria with normal query parameters, rather than in-line.

 

Note

In-line parameters are supported for System.Int32, System.Boolean, System.String, and System.Enum operand values.

Expanded Inheritance Hierarchy

System.Object
    CriteriaOperator
       OperandValue
          ConstantValue

Expanded See Also

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