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ParallelEnumerable.SingleOrDefault Method

Definition

Namespace:
System.Linq
Assemblies:
System.Core.dll, System.Linq.Parallel.dll
Assemblies:
netstandard.dll, System.Linq.Parallel.dll
Assembly:
System.Linq.Parallel.dll
Assembly:
System.Core.dll
Assembly:
netstandard.dll

Important

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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

Name Description
SingleOrDefault<TSource>(ParallelQuery<TSource>)

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

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.

SingleOrDefault<TSource>(ParallelQuery<TSource>)

Source:
ParallelEnumerable.cs
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

source
ParallelQuery<TSource>

The sequence to return the single element of.

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

Applies to

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

Source:
ParallelEnumerable.cs
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

source
ParallelQuery<TSource>

The sequence to return the single element of.

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.

See also

Applies to

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