FirstOrDefault(TSource) Method (ParallelQuery(TSource))
Collapse the table of content
Expand the table of content

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

.NET Framework (current version)
 

Returns the first element of a parallel sequence, or a default value if the sequence contains no elements.

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

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

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

The sequence to return the first element of.

Return Value

Type: TSource

default(TSource) if source is empty; otherwise, the first element in source.

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.

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
Return to top
Show:
© 2016 Microsoft