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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.linq.parallelenumerable.elementatordefault below:

ParallelEnumerable.ElementAtOrDefault<TSource> Method (System.Linq) | Microsoft Learn

ParallelEnumerable.ElementAtOrDefault<TSource> Method Definition

Returns the element at a specified index in a parallel sequence or a default value if the index is out of range.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static TSource ElementAtOrDefault(System::Linq::ParallelQuery<TSource> ^ source, int index);

public static TSource ElementAtOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source, int index);

public static TSource? ElementAtOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source, int index);

static member ElementAtOrDefault : System.Linq.ParallelQuery<'Source> * int -> 'Source

<Extension()>
Public Function ElementAtOrDefault(Of TSource) (source As ParallelQuery(Of TSource), index As Integer) As TSource

Type Parameters

TSource

The type of the elements of source.

Parameters

index: Int32

The zero-based index of the element to retrieve.

Returns

TSource

default(TSource) if the index is outside the bounds of the source sequence; otherwise, the element at the specified position in the source sequence.

Exceptions

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

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