QueryBuilder.SumBy<'T,'Q,^Value> Method (F#)
A query operator that selects a value for each element selected so far and returns the sum of these values.
Namespace/Module Path: Microsoft.FSharp.Linq
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature: member this.SumBy : QuerySource<'T,'Q> * ('T -> ^Value) -> ^Value when ^Value with static member (+) and ^Value with static member Zero // Usage: queryBuilder.SumBy (source, projection)