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

  • Article

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)

Parameters

  • 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.

Remarks

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

Platforms

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

Version Information

F# Core Library Versions

Supported in: 4.0, Portable

See Also

Reference

Linq.QueryBuilder Class (F#)

Microsoft.FSharp.Linq Namespace (F#)

Query Expressions (F#)