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System.Linq.AsyncEnumerable breaking change in .NET 10 (#44989)
* Switched to new defintion, revised tables * lint * fix table * wip * Update docs/core/compatibility/core-libraries/10.0/asyncenumerable.md Co-authored-by: Stephen Toub <[email protected]> * Feedback and ToC --------- Co-authored-by: Stephen Toub <[email protected]>
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‎docs/core/compatibility/10.0.md‎

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## Core .NET libraries
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| Title | Type of change | Introduced version |
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|----------------------------------------------------------------------------------------------------------------------------|---------------------|--------------------|
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| [API obsoletions with non-default diagnostic IDs](core-libraries/10.0/obsolete-apis.md) | Source incompatible | Preview 1 |
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| [ActivitySource.CreateActivity and ActivitySource.StartActivity behavior change](core-libraries/10.0/activity-sampling.md) | Behavioral change | Preview 1 |
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| [C# 14 overload resolution with span parameters](core-libraries/10.0/csharp-overload-resolution.md) | Behavioral change | Preview 1 |
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| [Consistent shift behavior in generic math](core-libraries/10.0/generic-math.md) | Behavioral change | Preview 1 |
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| [LDAP DirectoryControl parsing is now more stringent](core-libraries/10.0/ldap-directorycontrol-parsing.md) | Behavioral change | Preview 1 |
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| [MacCatalyst version normalization](core-libraries/10.0/maccatalyst-version-normalization.md) | Behavioral change | Preview 1 |
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| ---------------------------------------------------------------------------------------------------------------------------- | --------------------- | -------------------- |
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|------------------------------------------------------------------------------------------------------------------------------|-----------------------|----------------------|
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| [ActivitySource.CreateActivity and ActivitySource.StartActivity behavior change](core-libraries/10.0/activity-sampling.md) | Behavioral change | Preview 1 |
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| [C# 14 overload resolution with span parameters](core-libraries/10.0/csharp-overload-resolution.md) | Behavioral change | Preview 1 |
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| [Consistent shift behavior in generic math](core-libraries/10.0/generic-math.md) | Behavioral change | Preview 1 |
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| [LDAP DirectoryControl parsing is now more stringent](core-libraries/10.0/ldap-directorycontrol-parsing.md) | Behavioral change | Preview 1 |
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| [MacCatalyst version normalization](core-libraries/10.0/maccatalyst-version-normalization.md) | Behavioral change | Preview 1 |
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| [System.Linq.AsyncEnumerable included in core libraries](core-libraries/10.0/asyncenumerable.md) | Source incompatible | Preview 1 |
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## Globalization
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‎docs/core/compatibility/core-libraries/10.0/asyncenumerable.md‎

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---
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title: "Breaking change - System.Linq.AsyncEnumerable in .NET 10"
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description: "Learn about the breaking change in .NET 10 where the AsyncEnumerable class is now included."
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ms.date: 2/21/2025
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ai-usage: ai-assisted
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ms.custom: https://github.com/dotnet/docs/issues/44886
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---
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# System.Linq.AsyncEnumerable in .NET 10
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.NET 10 introduces the `AsyncEnumerable` class, which provides a full set of LINQ extension methods for the <xref:System.Collections.Generic.IAsyncEnumerable`1> type. This class replaces the community-maintained `System.Linq.Async` NuGet library, potentially causing compilation errors due to ambiguities.
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## Version introduced
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.NET 10 Preview 1
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## Previous behavior
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The `AsyncEnumerable` class in the `System.Linq.Async` package provided LINQ support for <xref:System.Collections.Generic.IAsyncEnumerable`1>.
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## New behavior
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The `AsyncEnumerable` class in .NET 10, as well as in the `System.Linq.AsyncEnumerable` NuGet package, provides LINQ support for <xref:System.Collections.Generic.IAsyncEnumerable`1>.
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## Type of breaking change
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This is a [source incompatible](../../categories.md#source-compatibility) change.
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## Reason for change
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<xref:System.Collections.Generic.IAsyncEnumerable`1> has become core enough that the platform itself should provide LINQ support for the type. Community support, including from the maintainers of `System.Linq.Async`, petitioned for this inclusion directly in the platform.
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## Recommended action
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If upgrading to .NET 10 and the code includes a direct package reference to `System.Linq.Async`, remove that package reference. For multitargeting both .NET 10 and previous versions, add a package reference to `System.Linq.AsyncEnumerable` instead.
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If `System.Linq.Async` is consumed indirectly via another package, avoid ambiguity errors by including this in the project:
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```xml
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<PackageReference Include="System.Linq.Async" Version="6.0.1">
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<ExcludeAssets>all</ExcludeAssets>
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</PackageReference>
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```
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Most consuming code will not need changes, but some call sites might need updates to refer to newer names and signatures.
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## Affected APIs
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- `System.Linq.AsyncEnumerable`
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- <xref:System.Collections.Generic.IAsyncEnumerable`1>

‎docs/core/compatibility/toc.yml‎

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href: core-libraries/10.0/ldap-directorycontrol-parsing.md
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- name: MacCatalyst version normalization
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href: core-libraries/10.0/maccatalyst-version-normalization.md
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- name: System.Linq.AsyncEnumerable included in core libraries
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href: core-libraries/10.0/asyncenumerable.md
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items:
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- name: System.Linq.AsyncEnumerable included in core libraries
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href: core-libraries/10.0/asyncenumerable.md
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- name: .NET 9
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- name: Adding a ZipArchiveEntry sets header general-purpose bit flags

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