Version: 2021.2

QueryEngine<T0>.AddNestedQueryAggregator

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public void AddNestedQueryAggregator (string token, Func<IEnumerable<TNestedQueryData>,IEnumerable<TNestedQueryData>> aggregator);

参数

token Name of the aggregator used when typing the query. This name is converted to lowercase when parsing the query to speed up the process.
aggregator Aggregator function. Takes the results of the nested query, and returns an aggregate that contains any number of items.

描述

Adds a new nested query aggregator. An aggregator is an operation that can be applied on a nested query to aggregate the results of the nested query according to certain criteria.

<typeparam name="TNestedQueryData">The type of data returned by the nested query.</typeparam>