ASP.NET Core 3: How to reference 3.0.0 assemblies in custom libraries?

Question

I see that applications that reference the Microsoft.AspNetCore.App framework (AKA ASP.NET Core 3.0) uses types from the assembly Microsoft.AspNetCore.Mvc.Abstractions, Version=3.0.0.0,

But I can't find a NuGet package with same version 3.0.0. How should I reference packages now? E.g. if I want to override ControlBase, how should I reference the Microsoft.AspNetCore.Mvc.Core, Version=3.0.0.0 assembly if there are no such package versions on NuGet?

After adding the following:

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

I have another kind of waning:

Which gives the error:

NETSDK1073: The FrameworkReference 'Microsoft.AspNetCore.App' was not recognized Routines.AspNetCore C:\Program Files\dotnet\sdk\3.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets 263

Unloading and reloading the application doesn't help.

The same problem occurs in an empty new project:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netstandard2.1</TargetFramework>
  </PropertyGroup>

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

Compilation

1>------ Rebuild All started: Project: ClassLibrary1, Configuration: Debug Any CPU ------

1>C:\Program Files\dotnet\sdk\3.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(263,5): error NETSDK1073: The FrameworkReference 'Microsoft.AspNetCore.App' was not recognized 1>Done building project "ClassLibrary1.csproj" -- FAILED. ========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

ESG · Accepted Answer · 2019-09-30 21:55:41Z

20

You need to add a FrameworkReference to your csproj

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

See Migrate from ASP.NET Core 2.2 to 3.0 for more details

answered Sep 30, 2019 at 21:55

ESG

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4 Comments

Roman Pokrovskij Over a year ago

Thank you... Why I can't reference the only one assembly? I would like to understand the architects motivation....

Roman Pokrovskij Over a year ago

And it doesn't work at least in my case. TargetFramework>netstandard2.1</TargetFramework> checked, no other libs. Even in new empty C# library (netstandard2.1 of course).

ESG Over a year ago

It might be due to asp.net core 3 requiring .net core 3, and not netstandard. When I change my target framework to netcoreapp3.0, and add the FrameworkReference, it all works.

Roman Pokrovskij Over a year ago

they wrote in netstadard2.1 subset (what can be platform dependent in Microsoft.AspNetCore.Mvc.Abstractions ?) and then publish it exclusively netcoreapp3.0 .. there are not limits for MS architects willfulness.

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