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

A query operator that selects the single, specific element of those selected so far, or a default value if that element is not found.

Namespace/Module Path: Microsoft.FSharp.Linq

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

// Signature:
member this.ExactlyOneOrDefault : QuerySource<'T,'Q> -> 'T

// Usage:
queryBuilder.ExactlyOneOrDefault (source)


Type: QuerySource<'T,'Q>

The input query.

The selected element or a default value for the type.

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