AsyncEnumerable.ElementAtOrDefaultAsync Method (System.Linq) (original) (raw)
Definition
Namespace:
Assembly:
System.Linq.AsyncEnumerable.dll
Package:
System.Linq.AsyncEnumerable v10.0.0-preview.5.25277.114
Important
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Overloads
ElementAtOrDefaultAsync(IAsyncEnumerable, Int32, CancellationToken)
Source:
Source:
Returns the element at a specified index in a sequence, or a default value if the index is out of range.
public static System.Threading.Tasks.ValueTask<TSource?> ElementAtOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, int index, System.Threading.CancellationToken cancellationToken = default);static member ElementAtOrDefaultAsync : System.Collections.Generic.IAsyncEnumerable<'Source> * int * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<'Source><Extension()>
Public Function ElementAtOrDefaultAsync(Of TSource) (source As IAsyncEnumerable(Of TSource), index As Integer, Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of TSource)Type Parameters
TSource
The type of the elements of source.
Parameters
index
The index of the element to retrieve, which is either from the beginning or the end of the sequence.
Returns
The default value of TSource if index is outside the bounds of the source sequence; otherwise, the element at the specified position in the source sequence.
Exceptions
Applies to
ElementAtOrDefaultAsync(IAsyncEnumerable, Index, CancellationToken)
Source:
Source:
Returns the element at a specified index in a sequence or a default value if the index is out of range.
public static System.Threading.Tasks.ValueTask<TSource?> ElementAtOrDefaultAsync<TSource>(this System.Collections.Generic.IAsyncEnumerable<TSource> source, Index index, System.Threading.CancellationToken cancellationToken = default);static member ElementAtOrDefaultAsync : System.Collections.Generic.IAsyncEnumerable<'Source> * Index * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<'Source><Extension()>
Public Function ElementAtOrDefaultAsync(Of TSource) (source As IAsyncEnumerable(Of TSource), index As Index, Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of TSource)Type Parameters
TSource
The type of the elements of source.
Parameters
index
The index of the element to retrieve, which is either from the start or the end.
cancellationToken
The token to monitor for cancellation requests. The default value is None.
Returns
default if index is outside the bounds of the source sequence; otherwise, the element at the specified position in the source sequence.
Exceptions
Remarks
If the type of source implements IList, that implementation is used to obtain the element at the specified index. Otherwise, this method obtains the specified element.
The default value for reference and nullable types is null.