Aggregate Enum

Enumerates aggregate functions.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.Data.v19.1.dll

Declaration

C#

public enum Aggregate

VB.NET

Public Enum Aggregate

Members

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.

Related API Members

The following properties accept/return Aggregate values:

Library	Related API Members
Cross-Platform Class Library	AggregateOperand.AggregateType
	JoinOperand.AggregateType
eXpressApp Framework	IRuleSupportsCollectionAggregatesProperties.TargetCollectionAggregate
	RuleRangeAttribute.TargetCollectionAggregate
	RuleRangeProperties.TargetCollectionAggregate
	RuleValueComparisonAttribute.TargetCollectionAggregate
	RuleValueComparisonProperties.TargetCollectionAggregate

Remarks

The values listed in this enumeration are used to set the AggregateOperand.AggregateType property.

AggregateOperand does not support nested expressions and complex property paths like Max(Document.<PersonID>LastName). Only names of owned properties are supported: Max(Document).

AggregateOperand may produce null instead of zero for an empty collection on a server side.

The Single function requires that the collection contain no more than one object. If the collection contains more objects, use the Condition property to specify a condition. The collection must contain only one object that satisfies the condition; otherwise, the function’s behavior is undefined (the function may return an unexpected value or throw an exception).