ICustomAggregateFormattable Interface

Defines server-side processing for custom aggregate functions.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.Data.v22.1.dll

Declaration

C#

public interface ICustomAggregateFormattable :
    ICustomAggregate

VB.NET

Public Interface ICustomAggregateFormattable
    Inherits ICustomAggregate

Related API Members

The following members return ICustomAggregateFormattable objects:

• ConnectionProviderSql.GetCustomAggregate(String)

Remarks

Implement this interface in addition to the ICustomAggregate interface to format a database-specific SQL command for your custom aggregate function. This interface declares the functionality required to evaluate the custom aggregate function within criteria on the database server.

Related GitHub Examples

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