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

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

ParallelEnumerable.SingleOrDefault Method Definition

Returns the only element of a parallel sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

Overloads SingleOrDefault<TSource>(ParallelQuery<TSource>)

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Returns the only element of a parallel sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

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

public static TSource SingleOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source);

public static TSource? SingleOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source);

static member SingleOrDefault : System.Linq.ParallelQuery<'Source> -> 'Source

<Extension()>
Public Function SingleOrDefault(Of TSource) (source As ParallelQuery(Of TSource)) As TSource

Type Parameters

TSource

The type of the elements of source.

Parameters Returns

TSource

The single element of the input sequence, or default() if the sequence contains no elements.

Exceptions

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

source has more than one element.

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

See also

Parallel LINQ (PLINQ)

SingleOrDefault<TSource>(ParallelQuery<TSource>, Func<TSource,Boolean>)

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Returns the only element of a parallel sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static TSource SingleOrDefault(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, bool> ^ predicate);

public static TSource SingleOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,bool> predicate);

public static TSource? SingleOrDefault<TSource>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,bool> predicate);

static member SingleOrDefault : System.Linq.ParallelQuery<'Source> * Func<'Source, bool> -> 'Source

<Extension()>
Public Function SingleOrDefault(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 an element for a condition.

Returns

TSource

The single element of the input sequence that satisfies the condition, or default() if no such element is found.

Exceptions

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

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

source is empty or multiple elements are returned.