RuleRangeProperties.TargetCollectionAggregate Property

Specifies the aggregate function to be checked by the Validation Rule, if the rule is applied to a collection property.

Namespace: DevExpress.Persistent.Validation

Assembly: DevExpress.Persistent.Base.v24.2.dll

NuGet Package: DevExpress.Persistent.Base

Declaration

[RulePropertiesIndex(3)]
public Aggregate? TargetCollectionAggregate { get; set; }

<RulePropertiesIndex(3)>
Public Property TargetCollectionAggregate As Aggregate?

Type	Description
Nullable<Aggregate>	A Nullable<Aggregate> object which specifies the aggregate function to be checked by the Validation Rule.

Available values:

Name	Description
Exists	Determines whether the object exists in the collection.
Count	Returns the number of objects in the collection.
Max	Returns the maximum expression value in the collection.
Min	Returns the minimum expression value in the collection.
Avg	Evaluates the average of the values in the collection.
Sum	Returns the sum of all the expression values in the collection.
Single	Returns a single object from the collection. The collection must contain no more than one object.
Custom	Returns a custom aggregate function‘s result.