ParallelEnumerable.Single(Of TSource) Method (ParallelQuery(Of TSource), Func(Of TSource, Boolean))

.NET Framework (current version)
 
System_CAPS_noteNote

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Returns the only element of a parallel sequence that satisfies a specified condition, and throws an exception if more than one such element exists.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

<ExtensionAttribute>
Public Shared Function Single(Of TSource) (
	source As ParallelQuery(Of TSource),
	predicate As Func(Of TSource, Boolean)
) As TSource

Parameters

source
Type: System.Linq.ParallelQuery(Of TSource)

The sequence to return the single element of.

predicate
Type: System.Func(Of TSource, Boolean)

A function to test an element for a condition.

Return Value

Type: TSource

The single element of the input sequence that satisfies a condition.

Type Parameters

TSource

The type of the elements of source.

Exception Condition
OperationCanceledException

The query was canceled with the token passed in through WithCancellation.

ArgumentNullException

source or predicate is a null reference (Nothing in Visual Basic).

AggregateException

One or more exceptions occurred during the evaluation of the query.

InvalidOperationException

No element satisfies the condition in predicate. -or- More than one element satisfies the condition in predicate.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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