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IGroupDescriptor

Interface

Represents a grouping abstraction that knows how to create group key and group sort expressions.

Definition

Assembly:Telerik.Windows.Data.dll

Syntax:

public interface IGroupDescriptor : INotifyPropertyChanged

Gets or sets the sort direction for this descriptor. If the value is null no sorting will be applied.

ListSortDirection? SortDirection { get; set; }

Property Value:

The sort direction. The default value is null.

Creates a group expression that returns the grouping key for each item in a collection.

Expression CreateGroupKeyExpression(Expression itemExpression)

Parameters:itemExpressionExpression

Expression representing an item in a collection.

Returns:

Expression that creates group key for the given item.

Creates the group order by expression that sorts the groups created from this descriptor.

Expression CreateGroupSortExpression(Expression groupingExpression)

Parameters:groupingExpressionExpression

The grouping expression, which represents the grouped items created from the CreateGroupKeyExpression(Expression).

Returns:

Expression that represents the sort criteria for each group.