ParallelEnumerable::LastOrDefault<TSource> Method (ParallelQuery<TSource>^, Func<TSource, Boolean>^)

.NET Framework (current version)

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Returns the last element of a parallel sequence that satisfies a condition, or a default value if no such element is found.

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

generic<typename TSource>
static TSource LastOrDefault(
	ParallelQuery<TSource>^ source,
	Func<TSource, bool>^ predicate


Type: System.Linq::ParallelQuery<TSource>^

The sequence to return an element from.

Type: System::Func<TSource, Boolean>^

A function to test each element for a condition.

Return Value

Type: TSource

default() if the sequence is empty or if no elements pass the test in the predicate function; otherwise, the last element that passes the test in the predicate function.

Type Parameters


The type of the elements of source.

Exception Condition

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


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


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.

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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