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

A query operator that performs a subsequent ordering of the elements selected so far in ascending order by the given nullable sorting key. This operator may only be used immediately after a sortBy, sortByDescending, thenBy or thenByDescending, or their nullable variants.

Namespace/Module Path: Microsoft.FSharp.Linq

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

// Signature:
member this.ThenByNullable : QuerySource<'T,'Q> * ('T -> Nullable<'Key>) -> QuerySource<'T,'Q> when 'Key : (IComparable) and 'Key : (new : unit ->  'Key) and 'Key : struct and 'Key :> ValueType

// Usage:
queryBuilder.ThenByNullable (source, keySelector)


Type: QuerySource<'T,'Q>

The input query


Type: 'T -> Nullable<'Key>

Specifies the field to sort by.

The sorted 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

© 2015 Microsoft