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QueryBuilder.GroupValBy<'T,'Key,'Value,'Q> 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 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)


source Type: QuerySource<'T,'Q>

The input query.

resultSelector Type: 'T -> 'Value

A function that computes a value for each element.

keySelector Type: 'T -> 'Key

A function that returns the grouping key for each element.

Return Value

The grouped query.


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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