title: .NET Core 2.1 can't reference a .NET Framework 4.7.2 Class library
body: <p>I have a .NET Core 2.1 app, a .NET MVC website (4.7.2) and I also have a .NET 4.7.2 class library. </p>
  
  <p>What I'm trying to do is have my core 2.1 project reference the class library. </p>
  
  <p>Now I've added the reference to the core project with no issues (it builds), but when I try to add the namespace to a class It doesn't come up. </p>
  
  <p>I want both the app and the MVC site to share the same class library.</p>
  
  <p>Here's the screen shot:</p>
  
  <p><a href="https://i.stack.imgur.com/Gw5Ae.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/Gw5Ae.jpg" alt="There should be another namespace, one called models "></a></p>
  
  <p>There should be another namespace, one called models </p>
  
  <p>Any help would be great. 
  Thanks</p>