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

Returns the last 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 LastOrDefault<TSource>(
	this ParallelQuery<TSource> source
)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Linq.ParallelQuery<TSource>
The sequence to return an element from.

Return Value

Type: TSource
default() if the source sequence is empty; otherwise, the last element in the sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

ExceptionCondition
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 last element is non-deterministic. For more information, see Order Preservation in PLINQ.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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