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Seq.exactlyOne<'T> Function (F#)

Returns the only element of the sequence.

Namespace/Module Path: Microsoft.FSharp.Collections.Seq

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

// Signature:
exactlyOne : seq<'T> -> 'T
// Usage:
Seq.exactlyOne source

source

Type: seq<'T>

The input sequence.

Exception

Condition

ArgumentException

Thrown when the input does not have precisely one element.

ArgumentNullException

Thrown when the input sequence is null.

The last element of the sequence.

This function is named ExactlyOne in the .NET assembly. If accessing the member from a .NET language other than F#, or through reflection, use this name.

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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

.0

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