count( )

Refines a WixDataAggregate to contain the item count of each group in the aggregation.

The count() function refines a WixDataAggregate to contain the item count in each of the aggregate's groups.

When the aggregation is run, the returned WixDataAggregateResult object contains items with the following additional key:value pair:

• The key is named "count".
• The value is the count of items aggregated in the group.