Question 1

How do I migrate my AsyncSeq code from version 3 to version 4?

Accepted Answer

Update direct calls to .GetEnumerator() to .GetAsyncEnumerator(ct) and .MoveNext() to .MoveNextAsync() to match the BCL IAsyncEnumerator contract. Remove any calls to AsyncSeq.ofAsyncEnum and AsyncSeq.toAsyncEnum as they are now obsolete and no-ops, per the migration notes.

Question 2

FSharp.Control.AsyncSeq vs System.Linq.Async for C#: which is better for async sequences?

Accepted Answer

AsyncSeq is ideal for F# projects needing idiomatic functional combinators and seamless F# integration, while System.Linq.Async is better suited for C# projects leveraging LINQ syntax. AsyncSeq offers better F# interoperability, but System.Linq.Async is more native to C#'s async workflows.

Question 3

How can I filter an async sequence in F# using AsyncSeq?

Accepted Answer

Use the AsyncSeq.filter function from the module, which takes a predicate and returns a new async sequence with only elements that satisfy the condition. This works similarly to synchronous Seq.filter but handles asynchronous value production efficiently.

Question 4

Can I use AsyncSeq with Entity Framework Core queries?

Accepted Answer

Yes, since AsyncSeq is compatible with IAsyncEnumerable, you can directly use EF Core's async methods that return IAsyncEnumerable and treat them as AsyncSeq in F# without conversion. This enables efficient streaming of query results in asynchronous workflows.

Question 5

What are the performance overheads of using AsyncSeq compared to synchronous sequences?

Accepted Answer

AsyncSeq introduces asynchronous overhead for I/O-bound operations, which is beneficial for streaming but may add latency for CPU-bound tasks. It's optimized for scenarios where values are produced asynchronously, so the trade-off is justified for async data pipelines.

Question 6

Is AsyncSeq thread-safe for concurrent access?

Accepted Answer

AsyncSeq itself is an immutable sequence abstraction, but thread safety depends on the underlying data source. The combinators are designed for functional composition, so for concurrent operations, use appropriate synchronization or consider F# agents for shared state management.

FSharp.Control.AsyncSeq

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