Can build and run on Visual Studio but cannot Publish

Question

I am having a weird situation where I cannot publish my final Web project. Here is the project structure:

Foo.Services.Common: this is shared library: .NET Standard 2.0.3, Microsoft.AspNetCore.Mvc.Core 2.1.0 with the class DefaultWebSettings defined.

Foo.Services.Common.Razor: Razor Class Library, has reference back to Foo.Services.Common and uses DefaultWebSettings: NETStandard.Library 2.0.3, Microsoft.AspNetCore.Mvc 2.1.0 and some other ASP.NET Core related package (static files, Configuration)

Foo.Services.Api: ASP.NET Core API only (no View, no Razor), has reference back to Foo.Services.Common. Publish well. Uses: Microsoft.AspNetCore.App 2.1.0, Microsoft.NETCore.App 2.1.0.

Foo.Services.Web: front end project. This one is the one I cannot publish! This one has references to both Common projects. Uses: Microsoft.AspNetCore.App 2.1.0, Microsoft.NETCore.App 2.1.0

However, upon publish, this one shows up:

The type or namespace name 'DefaultWebSettings' could not be found (are you missing a using directive or an assembly reference?)

The error location is in a file of Foo.Services.Common.Razor project, NOT the Web project.

Funnily, Visual Studio perfectly works even with IntelliSense and Go to Definition:

I can build in both Debug/Release mode, run with/without debug any project in the solution well. Moreover, publishing Foo.Services.Common.Razor works without any problem!

In short: I cannot publish my Web project and have no idea what is the problem. I have tried:

• Clean/Build.
• Delete/Re-add references.
• Manually delete all obj and bin folders.

Please show me what I may missing.

Answer 1

In the end, I had to remove Reference of the Common from Common.Razor and Web projects. I guess they could not build because of some conflict between .NET Standard and .NET Core. Had to copy all code of Common into Common.Razor.