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learn-build-service-prod merged 1 commit into from
May 20, 2026
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Auto Publish – main to live - 2026-05-20 23:01 UTC #5362

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2 changes: 1 addition & 1 deletion entity-framework/core/what-is-new/ef-core-6.0/breaking-changes.md
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Expand Up @@ -428,7 +428,7 @@ If your application expects joined entities to be returned in a particular order

#### Why

<xref:Microsoft.EntityFrameworkCore.DbSet`1> was originally made to implement <xref:System.Collections.Generic.IAsyncEnumerable`1> mainly in order to allow direct enumeration on it via the `foreach` construct. Unfortunately, when a project also references [System.Linq.Async](https://www.nuget.org/packages/System.Linq.Async) in order to compose async LINQ operators client-side, this resulted in an ambiguous invocation error between the operators defined over `IQueryable<T>` and those defined over `IAsyncEnumerable<T>`. C# 9 added [extension `GetEnumerator` support for `foreach` loops](/dotnet/csharp/language-reference/proposals/csharp-9.0/extension-getenumerator), removing the original main reason to reference `IAsyncEnumerable`.
<xref:Microsoft.EntityFrameworkCore.DbSet`1> was originally made to implement <xref:System.Collections.Generic.IAsyncEnumerable`1> mainly in order to allow direct enumeration on it via the `foreach` construct. Unfortunately, when a project also references [System.Linq.Async](https://www.nuget.org/packages/System.Linq.Async) in order to compose async LINQ operators client-side, this resulted in an ambiguous invocation error between the operators defined over `IQueryable<T>` and those defined over `IAsyncEnumerable<T>`. C# 9 added [extension `GetEnumerator` support for `foreach` loops](/dotnet/csharp/language-reference/statements/iteration-statements#the-foreach-statement), removing the original main reason to reference `IAsyncEnumerable`.

The vast majority of `DbSet` usages will continue to work as-is, since they compose LINQ operators over `DbSet`, enumerate it, etc. The only usages broken are those which attempt to cast `DbSet` directly to `IAsyncEnumerable`.

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