Microsoft.AspNetCore.Http.Features split

Microsoft.AspNetCore.Http.Features has been split into the following two assemblies:

  • Microsoft.AspNetCore.Http.Features
  • Microsoft.Extensions.Features

For discussion, see GitHub issue dotnet/aspnetcore#32307.

Version introduced

ASP.NET Core 6.0

Old behavior

Microsoft.AspNetCore.Http.Features 5.0 shipped both in the ASP.NET shared framework and as a NuGet package. Microsoft.AspNetCore.Http.Features 5.0 targeted .NET 4.6.1, .NET Standard 2.0, and .NET 5.

New behavior

Microsoft.AspNetCore.Http.Features 6.0 ships only in the ASP.NET shared framework, not as a NuGet package. It targets .NET 6 only.

Microsoft.Extensions.Features 6.0 ships in both the ASP.NET shared framework and as a NuGet package. It targets .NET 4.6.1, .NET Standard 2.0, and .NET 6.

The following types have been moved to the new Microsoft.Extensions.Features assembly:

These types are still in the Microsoft.AspNetCore.Http.Features namespace, and type forwards have been added for compatibility.

Reason for change

This change was introduced for two reasons:

  • Allows the core types to be shared more broadly across components.
  • Allows the remaining Http-specific components in Microsoft.AspNetCore.Http.Features to take advantage of new runtime and language features.

When upgrading to ASP.NET Core 6.0, remove any packages references for Microsoft.AspNetCore.Http.Features. Add a package reference for Microsoft.Extensions.Features only if required.

For class libraries that need to consume the types from Microsoft.AspNetCore.Http.Features, add a FrameworkReference instead:

<ItemGroup>
  <FrameworkReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>

For more information about adding the framework reference, see Use the ASP.NET Core shared framework.

Libraries with out of date references may encounter a TypeLoadException or the following error:

Error CS0433 The type 'IFeatureCollection' exists in both 'Microsoft.AspNetCore.Http.Features, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' and 'Microsoft.Extensions.Features, Version=6.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'

To resolve the error, add a FrameworkReference to Microsoft.AspNetCore.App to any of the affected projects.

For questions, see dotnet/aspnetcore#32307.

Affected APIs