QueryBuilder.ExactlyOne<'T,'Q> Method (F#)
A query operator that selects the single, specific element selected so far.
Namespace/Module Path: Microsoft.FSharp.Linq
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
member this.ExactlyOne : QuerySource<'T,'Q> -> 'T
// Usage:
queryBuilder.ExactlyOne (source)
Parameters
source
Type: QuerySource<'T,'Q>The input query.
Exceptions
Exception |
Condition |
|---|---|
Thrown when the query contains more than one selected element. |
Return Value
A single element.
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