AsyncEnumerable.DefaultIfEmpty Method

Definition

Namespace:

System.Linq

Assembly:

System.Linq.AsyncEnumerable.dll

Package:

System.Linq.AsyncEnumerable v10.0.0-preview.1.25080.5

Overloads

DefaultIfEmpty<TSource>(IAsyncEnumerable<TSource>)	Returns the elements of the specified sequence or the type parameter's default if the sequence is empty.
DefaultIfEmpty<TSource>(IAsyncEnumerable<TSource>, TSource)	Returns the elements of the specified sequence or the specified value if the sequence is empty.

DefaultIfEmpty<TSource>(IAsyncEnumerable<TSource>)

Source:

DefaultIfEmpty.cs

Returns the elements of the specified sequence or the type parameter's default if the sequence is empty.

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

public static System.Collections.Generic.IAsyncEnumerable<TSource?> DefaultIfEmpty<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source);

static member DefaultIfEmpty : System.Collections.Generic.IAsyncEnumerable<'Source> -> System.Collections.Generic.IAsyncEnumerable<'Source>

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

Type Parameters

TSource

The type of the elements of source.

Parameters

source

IAsyncEnumerable<TSource>

The sequence to return a default value for if it is empty.

Returns

IAsyncEnumerable<TSource>

An IAsyncEnumerable<T> object that contains the default value for the TSource type if source is empty; otherwise, source.

Exceptions

ArgumentNullException

source is null.

DefaultIfEmpty<TSource>(IAsyncEnumerable<TSource>, TSource)

Source:

DefaultIfEmpty.cs

Returns the elements of the specified sequence or the specified value if the sequence is empty.

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

public static System.Collections.Generic.IAsyncEnumerable<TSource> DefaultIfEmpty<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource defaultValue);

static member DefaultIfEmpty : System.Collections.Generic.IAsyncEnumerable<'Source> * 'Source -> System.Collections.Generic.IAsyncEnumerable<'Source>

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

Type Parameters

TSource

The type of the elements of source.

Parameters

source

IAsyncEnumerable<TSource>

The sequence to return a default value for if it is empty.

defaultValue

TSource

The value to return if the sequence is empty.

Returns

IAsyncEnumerable<TSource>

An IAsyncEnumerable<T> object that contains the default value for the TSource type if source is empty; otherwise, source.

Exceptions

ArgumentNullException

source is null.