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View this topic on docs.devexpress.com (Learn more)

Aggregate Enumeration

Enumerates aggregate functions.

Namespace:DevExpress.Data.Filtering
Assembly:DevExpress.Data.v19.2.dll

Expanded Public Members

Show: Inherited
  Name Description
Public field Avg Evaluates the average of the values in the collection.
Public field Count Returns the number of objects in the collection.
Public field Custom Returns a custom aggregate function's result.
Public field Exists Determines whether the object exists in the collection.
Public field Max Returns the maximum expression value in the collection.
Public field Min Returns the minimum expression value in the collection.
Public field Single Returns a single object from the collection. The collection must contain no more than one object.
Public field Sum Returns the sum of all the expression values in the collection.
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Expanded 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 (see AggregateOperand.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).

Expanded See Also

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