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>)

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

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.

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

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

.NET 9 and other versions
Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1
UWP 10.0

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

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.

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

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

.NET 9 and other versions
Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1
UWP 10.0