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.NET 6.0+

RuleUniqueValueAttribute.CriteriaEvaluationBehavior Property

Specifies whether to look for objects that are currently retrieved from the database, in addition to the objects in the database itself.

Namespace: DevExpress.Persistent.Validation

Assembly: DevExpress.Persistent.Base.v24.1.dll


public CriteriaEvaluationBehavior CriteriaEvaluationBehavior { get; set; }

Property Value

Type Description

A CriteriaEvaluationBehavior enumeration value representing the behavior for searching for the required objects.


The following values are available:

  • BeforeTransaction

    Only objects in the database will be considered.

  • InTransaction

    Objects in the database and those that are currently retrieved from it will be considered.

By default, this property is set to InTransaction.


When defining the RuleUniqueValueAttribute in code, the value for the CriteriaEvaluationBehavior property is passed as a named parameter. This means that you do not have to specify it. However, when specifying the parameter, use the following format: CriteriaEvaluationBehavior = CriteriaEvaluationBehavior.InTransaction (CriteriaEvaluationBehavior := CriteriaEvaluationBehavior.InTransaction, in Visual Basic).

See Also