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ParallelEnumerable.First<TSource> Method (ParallelQuery<TSource>)

.NET Framework (current version)
 

Returns the first element of a parallel sequence.

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

public static TSource First<TSource>(
	this ParallelQuery<TSource> source
)

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

The sequence to return the first element of.

Return Value

Type: TSource

The first element in the specified sequence.

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 is a null reference (Nothing in Visual Basic).

AggregateException

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

InvalidOperationException

source contains no elements.

If the query is not ordered, then the first element is non-deterministic. For more information, see Order Preservation in PLINQ.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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