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Visual Studio 2012
Visual F#
F# Core Library Reference
Microsoft.FSharp.Collections Namespace
Collections.Seq Module
Seq.append<'T> Function
Seq.average<^T> Function
Seq.averageBy<'T,^U> Function (F#)
Seq.cache<'T> Function (F#)
Seq.cast<'T> Function (F#)
Seq.choose<'T,'U> Function (F#)
Seq.collect<'T,'Collection,'U> Function (F#)
Seq.compareWith<'T> Function (F#)
Seq.concat<'Collection,'T> Function (F#)
Seq.countBy<'T,'Key> Function (F#)
Seq.delay<'T> Function (F#)
Seq.distinct<'T> Function (F#)
Seq.distinctBy<'T,'Key> Function (F#)
Seq.empty<'T> Type Function (F#)
Seq.exactlyOne<'T> Function (F#)
Seq.exists<'T> Function (F#)
Seq.exists2<'T1,'T2> Function (F#)
Seq.filter<'T> Function (F#)
Seq.find<'T> Function (F#)
Seq.findIndex<'T> Function (F#)
Seq.fold<'T,'State> Function (F#)
Seq.forall<'T> Function (F#)
Seq.forall2<'T1,'T2> Function (F#)
Seq.groupBy<'T,'Key> Function (F#)
Seq.head<'T> Function (F#)
Seq.init<'T> Function (F#)
Seq.initInfinite<'T> Function (F#)
Seq.isEmpty<'T> Function (F#)
Seq.iter<'T> Function (F#)
Seq.iteri<'T> Function (F#)
Seq.iter2<'T1,'T2> Function (F#)
Seq.last<'T> Function (F#)
Seq.length<'T> Function (F#)
Seq.map<'T,'U> Function (F#)
Seq.mapi<'T,'U> Function (F#)
Seq.map2<'T1,'T2,'U> Function (F#)
Seq.max<'T> Function (F#)
Seq.maxBy<'T,'U> Function (F#)
Seq.min<'T> Function (F#)
Seq.minBy<'T,'U> Function (F#)
Seq.nth<'T> Function (F#)
Seq.ofArray<'T> Function (F#)
Seq.ofList<'T> Function (F#)
Seq.pairwise<'T> Function (F#)
Seq.pick<'T,'U> Function (F#)
Seq.readonly<'T> Function (F#)
Seq.reduce<'T> Function (F#)
Seq.scan<'T,'State> Function (F#)
Seq.singleton<'T> Function (F#)
Seq.skip<'T> Function (F#)
Seq.skipWhile<'T> Function (F#)
Seq.sort<'T> Function (F#)
Seq.sortBy<'T,'Key> Function (F#)
Seq.sum<^T> Function (F#)
Seq.sumBy<'T,^U> Function (F#)
Seq.take<'T> Function (F#)
Seq.takeWhile<'T> Function (F#)
Seq.toArray<'T> Function (F#)
Seq.toList<'T> Function (F#)
Seq.tryFind<'T> Function (F#)
Seq.tryFindIndex<'T> Function (F#)
Seq.tryPick<'T,'U> Function (F#)
Seq.truncate<'T> Function (F#)
Seq.unfold<'State,'T> Function (F#)
Seq.where<'T> Function (F#)
Seq.windowed<'T> Function (F#)
Seq.zip<'T1,'T2> Function (F#)
Seq.zip3<'T1,'T2,'T3> Function (F#)
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Seq.sumBy<'T,^U> Function (F#)

Visual Studio 2012

Returns the sum of the results generated by applying the function to each element of the sequence.

Namespace/Module Path: Microsoft.FSharp.Collections.Seq

Assembly: FSharp.Core (in FSharp.Core.dll)

Copy 
// Signature:
Seq.sumBy : ('T -> ^U) -> seq<'T> -> ^U (requires ^U with static member (+) and ^U with static member Zero)

// Usage:
Seq.sumBy projection source
projection

Type: 'T -> ^U

A function to transform items from the input sequence into the quantity that will be summed.

source

Type: seq<'T>

The input sequence.

The sum of the results of applying the projection function to each element of the sequence.

The generated elements are summed using the + operator and Zero property associated with the generated type.

This function is named SumBy in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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