First(TSource) Method (ParallelQuery(TSource))

Task Parallel System.Threading

Returns the first element of a parallel sequence.

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

Syntax

Visual Basic (Declaration)
Public Shared Function First(Of TSource) ( _
	source As ParallelQuery(Of TSource) _
) As TSource
C#
public static TSource First<TSource>(
	ParallelQuery<TSource> source
)

Parameters

source
Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
The sequence to return the first element of.

Type Parameters

TSource
The type of the elements of source.

Return Value

The first element in the specified sequence.

Exceptions

ExceptionCondition
System..::.ArgumentNullException source is a null reference (Nothing in Visual Basic).
System..::.InvalidOperationException source contains no elements.
System..::.AggregateException One or more exceptions occurred during the evaluation of the query.
System..::.OperationCanceledException The query was canceled.

See Also