ICustomAggregate Interface

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.Data.v21.2.dll

Declaration

public interface ICustomAggregate

Public Interface ICustomAggregate

Remarks

Implement this interface to create a custom aggregate function. To support additional functionality with a custom aggregate function, implement the following interfaces:

• ICustomAggregateFormattable, to format a database-specific SQL command;
• ICustomAggregateQueryable, to use the custom aggregate function in LINQ to XPO expressions;
• ICustomAggregateConvertibleToExpression, to make the custom aggregate function convertible to a LINQ Expression.

Related GitHub Examples

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

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

Friend Class CountDistinctCustomAggregate
    Implements ICustomAggregate, ICustomAggregateQueryable, ICustomAggregateFormattable, ICustomAggregateConvertibleToExpression