Wolfgang.Extensions.IAsyncEnumerable.Legacy 0.6.0

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dotnet add package Wolfgang.Extensions.IAsyncEnumerable.Legacy --version 0.6.0

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<PackageReference Include="Wolfgang.Extensions.IAsyncEnumerable.Legacy" Version="0.6.0" />

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#:package Wolfgang.Extensions.IAsyncEnumerable.Legacy@0.6.0

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#addin nuget:?package=Wolfgang.Extensions.IAsyncEnumerable.Legacy&version=0.6.0
                    

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Wolfgang.Extensions.IAsyncEnumerable

A collection of extension methods for IAsyncEnumerable<T> in .NET — chunking, side-effect projection, eager iteration, and emptiness / quantifier predicates. Built async-first with strict analyzer enforcement and multi-TFM packaging.

📦 Installation

dotnet add package Wolfgang.Extensions.IAsyncEnumerable

NuGet Package: Wolfgang.Extensions.IAsyncEnumerable

On net462 / netstandard2.0, where System.Linq.AsyncEnumerable isn't available, add the companion legacy package for terminal operators (CountAsync, AnyAsync, FirstAsync, FirstOrDefaultAsync, ToListAsync):

dotnet add package Wolfgang.Extensions.IAsyncEnumerable.Legacy

NuGet Package: Wolfgang.Extensions.IAsyncEnumerable.Legacy

📄 License

This project is licensed under the MIT License. See the LICENSE file for details.

📚 Documentation

GitHub Repository: https://github.com/Chris-Wolfgang/IAsyncEnumerable-Extensions
API Documentation: https://Chris-Wolfgang.github.io/IAsyncEnumerable-Extensions/
CHANGELOG: CHANGELOG.md
Contributing Guide: CONTRIBUTING.md
Formatting Guide: docs/README-FORMATTING.md
DocFX Version Picker Troubleshooting: docs/DOCFX-VERSION-PICKER.md
Release Workflow Setup: docs/RELEASE-WORKFLOW-SETUP.md
Workflow Security: docs/WORKFLOW_SECURITY.md
Verify the build: docs/REPRODUCIBLE-BUILD.md

✨ Extension methods

All nine extensions live on IAsyncEnumerableExtensions (namespace Wolfgang.Extensions.IAsyncEnumerable). See the API documentation for signatures, parameter details, and per-method examples.

Method	Purpose
`ChunkAsync<T>(source, maxChunkSize, ct)`	Splits the stream into fixed-size `ICollection<T>` batches.
`DoAsync<T>(source, Action<T>, ct)`	Side-effect projection — runs a sync action per element; yields the originals unchanged.
`DoAsync<T>(source, Func<T, Task>, ct)`	Side-effect projection — runs an async action per element; yields the originals unchanged.
`ForEachAsync<T>(source, Action<T>, ct)`	Eager iteration with a sync action — terminal.
`ForEachAsync<T>(source, Func<T, Task>, ct)`	Eager iteration with an async action — terminal.
`IsEmptyAsync<T>(source, ct)`	`true` if the stream yields zero elements. Short-circuits on the first element.
`IsNullOrEmptyAsync<T>(source?, ct)`	`true` if the stream is `null` or yields zero elements. Null-tolerant.
`NoneAsync<T>(source, ct)`	`true` if the stream yields zero elements (same shape as `IsEmptyAsync`, different naming).
`NoneAsync<T>(source, predicate, ct)`	`true` if no element satisfies the predicate. Short-circuits on the first match.

Terminal operators (`Wolfgang.Extensions.IAsyncEnumerable.Legacy`, net462 / netstandard2.0 only)

These live on IAsyncEnumerableLegacyExtensions (same Wolfgang.Extensions.IAsyncEnumerable namespace, separate assembly). They exist only for TFMs where System.Linq.AsyncEnumerable isn't available — on net8.0+, use the BCL versions instead.

Method	Purpose
`CountAsync<T>(source, ct)`	Counts the elements in the stream.
`AnyAsync<T>(source, ct)`	`true` if the stream yields any elements. Short-circuits on the first element.
`AnyAsync<T>(source, predicate, ct)`	`true` if any element satisfies the predicate. Short-circuits on the first match.
`FirstAsync<T>(source, ct)`	The first element; throws `InvalidOperationException` if the stream is empty.
`FirstOrDefaultAsync<T>(source, ct)`	The first element, or `default(T)` if the stream is empty.
`ToListAsync<T>(source, ct)`	Materializes the stream into a `List<T>`.

🚀 Quick Start

using Wolfgang.Extensions.IAsyncEnumerable;

// Chunk an async stream into batches of up to 100, with logging side-effect
await foreach (var batch in source
    .DoAsync(x => logger.LogInformation("Processing {Item}", x))
    .ChunkAsync(maxChunkSize: 100, token: cancellationToken))
{
    await ProcessBatchAsync(batch);
}

🎯 Supported Frameworks

Wolfgang.Extensions.IAsyncEnumerable targets:

.NET Framework: 4.6.2
.NET Standard: 2.0
.NET: 8.0, 10.0

Wolfgang.Extensions.IAsyncEnumerable.Legacy targets:

.NET Framework: 4.6.2
.NET Standard: 2.0

See each package's NuGet page (main, Legacy) for the authoritative per-TFM compatibility matrix.

🔍 Code Quality

This project enforces strict analyzer rules and async-first patterns via:

Microsoft.CodeAnalysis.NetAnalyzers (built into the SDK) — correctness + performance
Roslynator.Analyzers — refactoring + style
AsyncFixer — async/await anti-patterns
Microsoft.VisualStudio.Threading.Analyzers — thread-safety + async patterns
Microsoft.CodeAnalysis.BannedApiAnalyzers — banned synchronous APIs (see BannedSymbols.txt)
Meziantou.Analyzer — broad code-quality rules
SonarAnalyzer.CSharp — industry-standard analysis
Microsoft.CodeAnalysis.PublicApiAnalyzers — public-API surface change detection (see src/.../PublicAPI.Shipped.txt)

<TreatWarningsAsErrors>true</TreatWarningsAsErrors> is active for Release builds, so any analyzer warning blocks the release pipeline.

BannedSymbols.txt prohibits the usual sync-over-async traps: Task.Wait() / Task.Result, Thread.Sleep, sync file/stream I/O, Parallel.For/ForEach, WebClient, BinaryFormatter.

🛠️ Building from Source

git clone https://github.com/Chris-Wolfgang/IAsyncEnumerable-Extensions.git
cd IAsyncEnumerable-Extensions
dotnet restore
dotnet build --configuration Release
dotnet test  --configuration Release

SDK requirement: the version installed by .github/workflows/pr.yaml (currently .NET 10 + side-by-side SDKs for the older TFMs). See docs/README-FORMATTING.md for the source-formatting workflow.

🙏 Acknowledgments

Microsoft.Bcl.AsyncInterfaces — IAsyncEnumerable<T> backport for net462 / netstandard2.0
The analyzer-package authors above
The .NET team for IAsyncEnumerable<T> and the async-stream language support that made this library a one-file project

Product	Compatible and additional computed target framework versions.
.NET	net5.0 was computed. net5.0-windows was computed. net6.0 was computed. net6.0-android was computed. net6.0-ios was computed. net6.0-maccatalyst was computed. net6.0-macos was computed. net6.0-tvos was computed. net6.0-windows was computed. net7.0 was computed. net7.0-android was computed. net7.0-ios was computed. net7.0-maccatalyst was computed. net7.0-macos was computed. net7.0-tvos was computed. net7.0-windows was computed. net8.0 was computed. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. net9.0 was computed. net9.0-android was computed. net9.0-browser was computed. net9.0-ios was computed. net9.0-maccatalyst was computed. net9.0-macos was computed. net9.0-tvos was computed. net9.0-windows was computed. net10.0 was computed. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-windows was computed.
.NET Core	netcoreapp2.0 was computed. netcoreapp2.1 was computed. netcoreapp2.2 was computed. netcoreapp3.0 was computed. netcoreapp3.1 was computed.
.NET Standard	netstandard2.0 is compatible. netstandard2.1 was computed.
.NET Framework	net461 was computed. net462 is compatible. net463 was computed. net47 was computed. net471 was computed. net472 was computed. net48 was computed. net481 was computed.
MonoAndroid	monoandroid was computed.
MonoMac	monomac was computed.
MonoTouch	monotouch was computed.
Tizen	tizen40 was computed. tizen60 was computed.
Xamarin.iOS	xamarinios was computed.
Xamarin.Mac	xamarinmac was computed.
Xamarin.TVOS	xamarintvos was computed.
Xamarin.WatchOS	xamarinwatchos was computed.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

.NETFramework 4.6.2
- Microsoft.Bcl.AsyncInterfaces (>= 10.0.11)
.NETStandard 2.0
- Microsoft.Bcl.AsyncInterfaces (>= 10.0.11)

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
0.6.0	129	8/29/2026