Retrieve Application Version in ASP Net Core 2.0 MVC

When you call typeof(RuntimeEnvironment).Assembly, you're querying the containing assembly of that type. In this case this would be System.Runtime.InteropServices.dll or Microsoft.Dotnet.PlatformAbstractions.dll, depending on the namespace you've imported.

To get the information of your own assembly, you could simply replace RuntimeEnvironment with one of your own types, for example

var appVersion = typeof(Program).Assembly
    .GetCustomAttribute<AssemblyFileVersionAttribute>().Version;

or even

var appVersion = typeof(HomeController).Assembly
    .GetCustomAttribute<AssemblyFileVersionAttribute>().Version;

This would return "6.6.7.0" if the Package version if your project is set as follows:

You were close!

Here you can find more information on reflection for .NET in general, but it should work fine for .NET Core.