IAsyncEnumerable<T>
IAsyncEnumerable<T> is a .NET generic interface for asynchronously enumerating a sequence whose elements are retrieved over time.
C# Concurrency: Asynchronous and multithreaded programming
IAsyncEnumerable<T> is a .NET generic interface representing an object that asynchronously provides an enumerator for traversing a sequence of values.
- How it is used
- Processes asynchronously generated or externally retrieved sequences with await foreach, including cancellation and asynchronous work queues.
- How deep it goes
- Descends from interface contracts through compiler-generated iterator state machines, cancellation forwarding, blocking adaptation, and channel-backed queue construction.
- Examples
- Demonstrates delayed integer generation, cancellation, compiler expansion, and a Channel<T>-based consuming work queue.
- What you can do after
- Build asynchronous iterators and consuming queues, consume them with await foreach, and apply cancellation or compatibility adapters appropriately.
Read how C# Concurrency: Asynchronous and multithreaded programming explains IAsyncEnumerable<T> →
.NET in Action, Second Edition
IAsyncEnumerable is a .NET interface for asynchronously enumerating a sequence whose elements may become available over time.
- How it is used
- Streams database query results from ASP.NET Core endpoints, especially for large datasets or slow queries.
- How deep it goes
- Explains synchronous comparison, response timing, JSON serialization, and connection completion, but not enumerator internals.
- Examples
- Uses a CatalogController GET endpoint returning IAsyncEnumerable<Book> from a filtered Entity Framework Core query.
- What you can do after
- Apply it via ASP.NET Core to stream database records without preparing the complete JSON response first.
Read how .NET in Action, Second Edition explains IAsyncEnumerable<T> →
Related concepts
- await foreachused by · await foreach is C# iteration syntax for asynchronously consuming elements from an asynchronous enumerable.
- WithCancellationconfigured by · WithCancellation is a .NET extension method that associates a cancellation token with an IAsyncEnumerable<T> for asynchronous iteration.
- IEnumerable<T>kind of · IEnumerable<T> is a .NET generic interface representing a sequence whose elements of type T can be traversed through an enumerator.
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