Method ElementAtAsync
View SourceElementAtAsync<TSource>(IAsyncEnumerable<TSource>, Index, CancellationToken)
Returns the element at a specified index in a sequence.
Declaration
public static ValueTask<TSource> ElementAtAsync<TSource>(this IAsyncEnumerable<TSource> source, Index index, CancellationToken cancellationToken = default)Parameters
| Type | Name | Description |
|---|---|---|
| IAsyncEnumerable<TSource> | source | An IAsyncEnumerable<T> to return an element from. |
| Index | index | The index of the element to retrieve, which is either from the start or the end. |
| CancellationToken | cancellationToken | The optional cancellation token to be used for cancelling the sequence at any time. |
Returns
| Type | Description |
|---|---|
| ValueTask<TSource> | The element at the specified position in the |
Type Parameters
| Name | Description |
|---|---|
| TSource | The type of the elements of |
Remarks
This method throws an exception if index is out of range.
To instead return a default value when the specified index is out of range,
use the ElementAtOrDefaultAsync<TSource>(IAsyncEnumerable<TSource>, Index, CancellationToken) method.
Exceptions
| Type | Condition |
|---|---|
| ArgumentNullException |
|
| ArgumentOutOfRangeException |
|