how to determine if a .net app is a "core" app? : <p>I need to update a new .NET app and I think it was mentioned that it was .NET Core.  How can I examine the solution properties to determine if it is in fact a "core" app?</p>

<p>The web project has a System.Core reference but I googled this and it seems that System.Core.dll has been a part of the .NET framework since  at least .NET f/w 3.5.</p>

<p>The app has a package.json file but the existence of that file in a sln does not necessarily guarantee that the app is a .NET core app.  I've also read that a .NET core app can run on different .NET framework versions.</p>

<p>So how can I determine if a .NET app is indeed a "Core" app? In other words, what makes a Core app a Core app?</p>
