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QueryBuilder.SumBy<'T,'Q,^Value> Method (F#)

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

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)


source Type: QuerySource<'T,'Q>

The input query.

projection Type: 'T -> ^Value

A function to compute the values to sum.

Return Value

The resulting sum.


For more information and examples, see Query Expressions (F#).


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

Version Information

F# Core Library Versions

Supported in: 4.0, Portable

See Also

Linq.QueryBuilder Class (F#)

Microsoft.FSharp.Linq Namespace (F#)

Query Expressions (F#)

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