FSharp.Control.AsyncSeq

FSharp.Control.AsyncSeq is a collection of asynchronous programming utilities for F#.

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Version 4.0 — BCL IAsyncEnumerable Compatibility

As of v4.0, AsyncSeq<'T> is a type alias for System.Collections.Generic.IAsyncEnumerable<'T> (the BCL type). This means:

• AsyncSeq<'T> values are directly usable anywhere IAsyncEnumerable<'T> is expected (e.g. await foreach in C#, IAsyncEnumerable<T> APIs).
• IAsyncEnumerable<'T> values (from EF Core, ASP.NET Core streaming endpoints, etc.) can be used directly wherever AsyncSeq<'T> is expected — no conversion needed.
• The AsyncSeq.ofAsyncEnum and AsyncSeq.toAsyncEnum helpers are now no-ops and have been marked [<Obsolete>]. Remove any calls to them.

Migrating from v3.x

If you called .GetEnumerator() / .MoveNext() directly on an AsyncSeq<'T>, update to .GetAsyncEnumerator(ct) / .MoveNextAsync() (the IAsyncEnumerator<'T> BCL contract). All other AsyncSeq module combinators are unchanged.

Maintainer(s)

• @dsyme
• @martinmoec
• @xperiandri
• @abelbraaksma

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