Method BindByIndex

BindByIndex<TSource>(IAsyncEnumerable<TSource>, IAsyncEnumerable<int>)

Selects elements by index from a sequence.

Declaration

public static IAsyncEnumerable<TSource> BindByIndex<TSource>(this IAsyncEnumerable<TSource> source, IAsyncEnumerable<int> indices)

Parameters

Type	Name	Description
IAsyncEnumerable<TSource>	source	The source sequence.
IAsyncEnumerable<int>	indices	The list of indices of elements in the source sequence to select.

Returns

Type	Description
IAsyncEnumerable<TSource>	An IAsyncEnumerable<T> whose elements are the result of selecting elements according to the indices sequence.

Type Parameters

Name	Description
TSource	The type of the elements of source.

Exceptions

Type	Condition
ArgumentNullException	source is null.
ArgumentNullException	indices is null.
ArgumentOutOfRangeException	An index in indices is out of range for the input sequence source.

BindByIndex<TSource, TResult>(IAsyncEnumerable<TSource>, IAsyncEnumerable<int>, Func<TSource, int, TResult>, Func<int, TResult>)

Selects elements by index from a sequence and transforms them using the provided functions.

Declaration

public static IAsyncEnumerable<TResult> BindByIndex<TSource, TResult>(this IAsyncEnumerable<TSource> source, IAsyncEnumerable<int> indices, Func<TSource, int, TResult> resultSelector, Func<int, TResult> missingSelector)

Parameters

Type	Name	Description
IAsyncEnumerable<TSource>	source	The source sequence.
IAsyncEnumerable<int>	indices	The list of indices of elements in the source sequence to select.
Func<TSource, int, TResult>	resultSelector	A transform function to apply to each source element; the second parameter of the function represents the index of the output sequence.
Func<int, TResult>	missingSelector	A transform function to apply to missing source elements; the parameter represents the index of the output sequence.

Returns

Type	Description
IAsyncEnumerable<TResult>	An IAsyncEnumerable<T> whose elements are the result of selecting elements according to the indices sequence and invoking the transform function.

Type Parameters

Name	Description
TSource	The type of the elements of source.
TResult	The type of the elements of the resulting sequence.

Remarks

This method uses deferred execution and streams its results.

Exceptions

Type	Condition
ArgumentNullException	source is null.
ArgumentNullException	indices is null.
ArgumentNullException	resultSelector is null.
ArgumentNullException	missingSelector is null.