Method Using

Using<TSource, TResource>(Func<TResource>, Func<TResource, IAsyncEnumerable<TSource>>)

Generates a sequence that's dependent on a resource object whose lifetime is determined by the sequence usage duration.

Declaration

public static IAsyncEnumerable<TSource> Using<TSource, TResource>(Func<TResource> resourceFactory, Func<TResource, IAsyncEnumerable<TSource>> enumerableFactory) where TResource : IAsyncDisposable

Parameters

Type	Name	Description
Func<TResource>	resourceFactory	Resource factory function.
Func<TResource, IAsyncEnumerable<TSource>>	enumerableFactory	Enumerable factory function, having access to the obtained resource.

Returns

Type	Description
IAsyncEnumerable<TSource>	Sequence whose use controls the lifetime of the associated obtained resource.

Type Parameters

Name	Description
TSource	Source element type.
TResource	Resource type.

Remarks

resourceFactory and enumerableFactory are evaluated lazily, once enumeration has begun. The value returned by resourceFactory will be disposed after the enumeration has completed.

The values returned by enumerableFactory and enumerableFactory are not cached; multiple iterations of the IAsyncEnumerable<T> returned by this method will call these methods separately for each iteration.

Exceptions

Type	Condition
ArgumentNullException	resourceFactory or enumerableFactory is null.