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AggregateOperand.Exists(CriteriaOperator) Method

Creates a new AggregateOperand which determines whether or not the count of AggregateOperand.CollectionProperty elements that match the AggregateOperand.Condition is greater than zero.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.Data.v24.1.dll

NuGet Package: DevExpress.Data

Declaration

public AggregateOperand Exists(
    CriteriaOperator aggregatedExpression
)

Parameters

Name Type Description
aggregatedExpression CriteriaOperator

A CriteriaOperator object which specifies the aggregate expression.

Returns

Type Description
AggregateOperand

An AggregateOperand object which calculates an aggregate expression.

Example

Check whether a collection has elements that match a criteria.

Expression:

CriteriaOperator.FromLambda<Order>(o => o.OrderItems.Any(oi=>oi.ItemPrice==20)); ;
Test

Input:

Order

OrderItemName

ItemPrice

Order0

OrderItem1

20

OrderItem2

30

The result: True

See Also