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

A query operator that determines whether any element selected so far satisfies a condition.

Namespace/Module Path: Microsoft.FSharp.Linq

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

// Signature:
member this.Exists : QuerySource<'T,'Q> * ('T -> bool) -> bool

// Usage:
queryBuilder.Exists (source, predicate)

Parameters

• source
  Type: QuerySource<'T,'Q>

  The input query.

• predicate
  Type: 'T -> bool

  A function that tests each element.

Return Value

true if any element of the source query satisfies predicate.

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#)