QueryBuilder.GroupValBy<'T,'Key,'Value,'Q> Method (F#)
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QueryBuilder.GroupValBy<'T,'Key,'Value,'Q> Method (F#)


A query operator that selects a value for each element selected so far and groups the elements by the given key.

Namespace/Module Path: Microsoft.FSharp.Linq

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

// Signature:
member this.GroupValBy : QuerySource<'T,'Q> * ('T -> 'Value) * ('T -> 'Key) -> QuerySource<IGrouping<'Key,'Value>,'Q> when 'Key : equality

// Usage:
queryBuilder.GroupValBy (source, resultSelector, keySelector)


Type: QuerySource<'T,'Q>

The input query.


Type: 'T -> 'Value

A function that computes a value for each element.


Type: 'T -> 'Key

A function that returns the grouping key for each element.

The grouped query.

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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