Installed NuGet package, Visual Studio claims assembly not referenced - asp.net-core

Question

you can see that I have referenced it through nuget, but is still complaining. This is in a .net 4.6.1 framework class library in an embedded view component.
I'm also using a .net framework asp.net core web app.
I'm having a bunch of issues trying to get razor to work, but this one is a new one. MenuViewPage inherits RazorPage and is located in another assembly.
I think I should just install .net core 2, and aspnetcore.all ;)\
Anyone have any ideas why this is happening?

Answer 1

So after hours of trying to sort this issue out I've come to a solution:
When creating a web class library, whether you are using it for application parts or you are creating your core project with base classes I advise you covert it from a normal .net class library to a web enabled one.
To convert it to a web class library you need to change the project to use the following .csproj, then make sure to run dotnet restore.
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup Label="Configuration" Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<OutputType>Library</OutputType>
</PropertyGroup>
<PropertyGroup>
<TargetFramework>net461</TargetFramework>
<RuntimeIdentifier>win7-x86</RuntimeIdentifier>
<PreserveCompilationContext>true</PreserveCompilationContext>
<ApplicationIcon />
<OutputTypeEx>library</OutputTypeEx>
<StartupObject />
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<DocumentationFile></DocumentationFile>
<NoWarn>1701;1702;1705;1591</NoWarn>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.0.0" />
<PackageReference Include="Microsoft.AspNetCore" Version="1.1.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.3" />
<PackageReference Include="Microsoft.AspNetCore.Session" Version="1.1.2" />
<PackageReference Include="Microsoft.AspNetCore.Razor">
<Version>1.1.2</Version>
</PackageReference>
<PackageReference Include="Microsoft.AspNetCore.Razor.Runtime">
<Version>1.1.2</Version>
</PackageReference>
<PackageReference Include="System.Net.Http" Version="4.3.2" />
</ItemGroup>
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.1" />
</ItemGroup>
</Project>
Make sure you are making the output type a library.
I ran into issues with the assembly info file, it seems to be generated during build now, so I commented out the assembly.info stuff by double clicking "Properties"
I hope this helps someone in the future.