ICustomAggregateQueryable Interface

The interface that must be implemented by classes that provide information on custom aggregate functions to use in LINQ to XPO expressions.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.2.dll

Declaration

C#

public interface ICustomAggregateQueryable

VB.NET

Public Interface ICustomAggregateQueryable

Remarks

Implement this interface in addition to the ICustomAggregate interface to use a custom aggregate function in LINQ to XPO expressions.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the ICustomAggregateQueryable interface.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XPO_how-to-implement-custom-aggregates/CS/XpoCustomAggregate/CustomAggregates/CountDistinctCustomAggregate.cs#L11

namespace XpoCustomAggregate {
    class CountDistinctCustomAggregate : ICustomAggregate, ICustomAggregateQueryable, ICustomAggregateFormattable, ICustomAggregateConvertibleToExpression {
        static readonly CountDistinctCustomAggregate instance = new CountDistinctCustomAggregate();

VB.NET

XPO_how-to-implement-custom-aggregates/VB/XpoCustomAggregate/CustomAggregates/CountDistinctCustomAggregate.vb#L12

Friend Class CountDistinctCustomAggregate
    Implements ICustomAggregate, ICustomAggregateQueryable, ICustomAggregateFormattable, ICustomAggregateConvertibleToExpression