.net-standard-2.0

I want to create a class library project with Target Framework .NET Standard 2.0. I've updated my Visual Studio 2017 to Version 15.3 and also in Visual Studio installer checked .NET Framework 4.7 SDK and .NET Framework 4.7 targeting pack manually and installed them. There is still no .NET Standard 2.0 option in the Target Framework combo box in the Project/Application window. So I changed TargetFramework tag in .csproj file manually to netstandard2.0 , but after trying to build I get this error: The current .NET SDK does not support targeting .NET Standard 2.0. Either target .NET Standard 1.6

I'm writing an MVC website using ASP.NET Core 2.0. In the ASP.NET Core project (let's call it Web ), I reference a .NET Standard 2 project in the same solution (let's call it Service ). The Service project also references a third .NET Standard 2 library in the solution (let's call this one Business ). The Business project declares a type called Model . The problem is that I can use Model in the Web project (i.e. the compiler sees the type Model and I can do var a = new Model(); ) as if the Web project has referenced Business , but it actually only has a reference to Service . How can I hide

As I need to import a library targeting .NET Standard 2, I had upgraded my library to .NET 4.7.1, as I understood from this MS video that should avoid this issue: https://www.youtube.com/watch?v=u67Eu_IgEMs However, adding .NET standard now results in dozens of System.xxx references, rather than a single reference to .NET Standard (as per the video). Worse still, several of the references have been added but the underlying file appears to be missing generating warnings, e.g. Warning The referenced component 'Microsoft.Win32.Primitives' could not be found. Warning The referenced component