using System;

using System.Linq;

using System.IO;

using System.Reflection.PortableExecutable;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Environment.OSVersion);

        var currentAssemblyIsManaged = IsManaged(typeof(Program).Assembly.Location) ?? false;

        Console.WriteLine($"The currently executing assembly is {(currentAssemblyIsManaged ? "" : "not ")}managed");

        Console.WriteLine("Here are some unmanaged assemblies:");

        var unmanagedAssemblies = ((string)AppContext.GetData("TRUSTED_PLATFORM_ASSEMBLIES"))

            .Split(OperatingSystem.IsWindows() ? ';' : ':')

            .Select(path => Path.GetDirectoryName(path))

            .Distinct()

            .SelectMany(directory => Directory.GetFiles(directory))

            .Where(file => IsManaged(file) == false);

        foreach (var path in unmanagedAssemblies)

        {

            Console.Write('\t');

            Console.WriteLine(path);

        }

    }

    static bool? IsManaged(string path)

    {

        try

        {

            using var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);

            using var peReader = new PEReader(stream);

            return peReader.HasMetadata;

        }

        catch

        {

            // Probably not an assembly, but maybe the file is merely inaccessible at the moment?

            return null;

        }

    }

}