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

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

ParallelEnumerable.DefaultIfEmpty Method Definition

Returns the elements of the specified parallel sequence or the specified value in a singleton collection if the sequence is empty.

Overloads DefaultIfEmpty<TSource>(ParallelQuery<TSource>)

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Returns the elements of the specified parallel sequence or the type parameter's default value in a singleton collection if the sequence is empty.

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

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

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

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

Type Parameters

TSource

The type of the elements of source.

Parameters Returns

A sequence that contains default(TSource) if source is empty; otherwise, source.

Exceptions

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

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

See also

Parallel LINQ (PLINQ)

DefaultIfEmpty<TSource>(ParallelQuery<TSource>, TSource)

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Returns the elements of the specified parallel sequence or the specified value in a singleton collection if the sequence is empty.

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

public static System.Linq.ParallelQuery<TSource> DefaultIfEmpty<TSource>(this System.Linq.ParallelQuery<TSource> source, TSource defaultValue);

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

<Extension()>
Public Function DefaultIfEmpty(Of TSource) (source As ParallelQuery(Of TSource), defaultValue As TSource) As ParallelQuery(Of TSource)

Type Parameters

TSource

The type of the elements of source.

Parameters

defaultValue: TSource

The value to return if the sequence is empty.

Returns

A sequence that contains defaultValue if source is empty; otherwise, source.

Exceptions

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

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