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ParallelEnumerable.LastOrDefault Method (System.Linq) | Microsoft Learn

ParallelEnumerable.LastOrDefault Method Definition

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

Overloads LastOrDefault<TSource>(ParallelQuery<TSource>, Func<TSource,Boolean>)
Source:
ParallelEnumerable.cs
Source:
ParallelEnumerable.cs
Source:
ParallelEnumerable.cs
Source:
ParallelEnumerable.cs

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

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static TSource LastOrDefault(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, bool> ^ predicate);
public static TSource LastOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,bool> predicate);
public static TSource? LastOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,bool> predicate);
static member LastOrDefault : System.Linq.ParallelQuery<'Source> * Func<'Source, bool> -> 'Source
<Extension()>
Public Function LastOrDefault(Of TSource) (source As ParallelQuery(Of TSource), predicate As Func(Of TSource, Boolean)) As TSource
Type Parameters
TSource

The type of the elements of source.

Parameters
predicate
Func<TSource,Boolean>

A function to test each element for a condition.

Returns

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.

Exceptions

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

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

Remarks

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

See also LastOrDefault<TSource>(ParallelQuery<TSource>)
Source:
ParallelEnumerable.cs
Source:
ParallelEnumerable.cs
Source:
ParallelEnumerable.cs
Source:
ParallelEnumerable.cs

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

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static TSource LastOrDefault(System::Linq::ParallelQuery<TSource> ^ source);
public static TSource LastOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source);
public static TSource? LastOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source);
static member LastOrDefault : System.Linq.ParallelQuery<'Source> -> 'Source
<Extension()>
Public Function LastOrDefault(Of TSource) (source As ParallelQuery(Of TSource)) As TSource
Type Parameters
TSource

The type of the elements of source.

Parameters Returns

TSource

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

Exceptions

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

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

Remarks

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

See also

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