AsyncEnumerable.ContainsAsync<TSource> Method
Definition
Important
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Determines whether a sequence contains a specified element.
public static System.Threading.Tasks.ValueTask<bool> ContainsAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, TSource value, System.Collections.Generic.IEqualityComparer<TSource>? comparer = default, System.Threading.CancellationToken cancellationToken = default);static member ContainsAsync : System.Collections.Generic.IAsyncEnumerable<'Source> * 'Source * System.Collections.Generic.IEqualityComparer<'Source> * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<bool><Extension()>
Public Function ContainsAsync(Of TSource) (source As IAsyncEnumerable(Of TSource), value As TSource, Optional comparer As IEqualityComparer(Of TSource) = Nothing, Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of Boolean)Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IAsyncEnumerable<TSource>
A sequence in which to locate a value.
- value
- TSource
The value to locate in the sequence.
- comparer
- IEqualityComparer<TSource>
An equality comparer to compare values.
- cancellationToken
- CancellationToken
The CancellationToken to monitor for cancellation requests. The default is None.
Returns
true if the source sequence contains an element that has the specified value; otherwise, false.
Exceptions
source is null.
Applies to
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