How to reference ASP.NET Core 6 types in .NET 6 library?

Question

I am working on internal libraries for my organization. I need to reference certain types that normally "belong" to web apps, eg. to provide some extensions:

WebApplicationOptions
HttpContext

If I use <Project Sdk="Microsoft.NET.Sdk">, i don't have references to these types and can't find any nuget package which contains them. If i use <Project Sdk="Microsoft.NET.Sdk.Web">, i can't build my class library because it is treated as application and has to specify entry point.

So, my question in general: what is the right way to write libraries for ASP.NET Core 6?

Back in core 2.x days there were packages for everything, like Microsoft.AspNetCore.Http.Abstractions. They are all stuck at version 2.2.0 and i assume they're not usable now?

A very similar Q&A, differing mainly in the versions, but still after the huge change in ASP.NET Core 3.0: stackoverflow.com/q/58175530/2157640 — Palec
– Palec, Commented Dec 16, 2022 at 23:23

TylerH · Accepted Answer · 2024-01-25 19:29:54Z

98

You need to add a FrameworkReference to your project file instead of a PackageReference as described here.

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

Right-click your project in the Solution Explorer and select "Edit Project File" to open the file and look for the <ItemGroup> section, creating a new one if it does not exist.

edited Jan 25, 2024 at 19:29

TylerH

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answered Jan 25, 2022 at 10:47

Martin Costello

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2 Comments

Artur Krajewski Over a year ago

Just a side-note. Of course this does not work for netstandard targets.

angularsen Over a year ago

Also, does not work for MAUI. github.com/dotnet/maui/issues/17725

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