public AggregationHelper <TSource, TResult> GroupBy <TValue>(Expression <Func <TSource, TValue> > keySelector)
{
foreach (var key in AggregationHelper.ExtractGroupingKeys(keySelector, typeof(TResult)))
{
_mappings.Add(key);
}
return(this);
}
public AggregationResult <T> Lift <TKey>(Expression <Func <T, TKey> > keySelector, Func <T, string> label)
{
if (keySelector == null)
{
throw new ArgumentNullException(nameof(keySelector));
}
var keys = AggregationHelper.ExtractGroupingKeys(keySelector, typeof(T));
Lift(keys, AggregationLevel.Subtotal, label);
return(this);
}
