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

A query operator that selects a nullable value for each element selected so far and returns the sum of these values. If any nullable element does not have a value, it is ignored.

Namespace/Module Path: Microsoft.FSharp.Linq

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

// Signature:
member this.SumByNullable : QuerySource<'T,'Q> * ('T -> Nullable<^Value>) -> Nullable<^Value> when ^Value with static member (+) and ^Value with static member Zero and ^Value : (new : unit ->  ^Value) and ^Value : struct and ^Value :> ValueType

// Usage:
queryBuilder.SumByNullable (source, valueSelector)


Type: QuerySource<'T,'Q>

The input query.


Type: 'T -> Nullable<T><^Value>

A function to compute the values to sum.

The resulting sum.

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

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

F# Core Library Versions

Supported in: 4.0, Portable

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