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ParallelEnumerable.DefaultIfEmpty 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 elements of the specified parallel sequence or the specified value in a singleton collection if the sequence is empty.
Overloads
| Name | Description |
|---|---|
| DefaultIfEmpty<TSource>(ParallelQuery<TSource>) |
Returns the elements of the specified parallel sequence or the type parameter's default value in a singleton collection if the sequence is empty. |
| DefaultIfEmpty<TSource>(ParallelQuery<TSource>, TSource) |
Returns the elements of the specified parallel sequence or the specified value in a singleton collection if the sequence is empty. |
DefaultIfEmpty<TSource>(ParallelQuery<TSource>)
- Source:
- ParallelEnumerable.cs
- 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
- source
- ParallelQuery<TSource>
The sequence to return a default value for if it is empty.
Returns
A sequence that contains default(TSource) if source is empty; otherwise, source.
Exceptions
source is a null reference (Nothing in Visual Basic).
The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).
One or more exceptions occurred during the evaluation of the query.
See also
Applies to
DefaultIfEmpty<TSource>(ParallelQuery<TSource>, TSource)
- Source:
- ParallelEnumerable.cs
- 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
- source
- ParallelQuery<TSource>
The sequence to return the specified value for if it is empty.
- 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).
The query was canceled with the token passed in through WithCancellation<TSource>(ParallelQuery<TSource>, CancellationToken).
One or more exceptions occurred during the evaluation of the query.
See also
Applies to
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