AggregateOperand.Max(CriteriaOperator) Method

Creates a new AggregateOperand which returns the maximum of the values calculated by the given aggregate expression. This expression is evaluated against elements of the AggregateOperand.CollectionProperty that match the specified AggregateOperand.Condition.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.Data.v24.2.dll

Declaration

C#

public AggregateOperand Max(
    CriteriaOperator aggregatedExpression
)

VB.NET

Public Function Max(
    aggregatedExpression As CriteriaOperator
) As AggregateOperand

Parameters

Name	Type	Description
aggregatedExpression	CriteriaOperator	A CriteriaOperator object which specifies the aggregate expression. This parameter may be ignored in certain circumstances.

Returns

Type	Description
AggregateOperand	An AggregateOperand object which calculates an aggregate expression.

Example

Example 1

Get the max value from a whole collection.

Expression:

LINQ

CriteriaOperator.FromLambda<Order, int>(o => o.OrderItems.Max(oi => oi.ItemPrice));

Typed

new AggregateOperand(new OperandProperty(nameof(Order.OrderItems)), new OperandProperty(nameof(OrderItem.ItemPrice)), Aggregate.Max, null);

String

CriteriaOperator.Parse("OrderItems.Max(ItemPrice)");

Test

Input:

Order	OrderItemName	ItemPrice
Order0
	OrderItem1	10
	OrderItem2	20

The result: 20

Example 2

Get the max value from a filtered collection.

Expression:

LINQ

CriteriaOperator.FromLambda<Order, int>(o => o.OrderItems.Where(oi => oi.IsAvailable == true).Max(oi => oi.ItemPrice)); ;

Typed

new AggregateOperand(new OperandProperty(nameof(Order.OrderItems)), new OperandProperty(nameof(OrderItem.ItemPrice)), Aggregate.Max, new BinaryOperator(nameof(OrderItem.IsAvailable),true));

String

CriteriaOperator.Parse("[OrderItems][IsAvailable=True].Max(ItemPrice)");

Test

Input:

Order	OrderItemName	ItemPrice	IsAvailable
Order0
	OrderItem1	10	False
	OrderItem2	20	True
	OrderItem2	30	True
	OrderItem2	40	False

The result: 30