TagAssembliesTest.cs

using Microsoft.Extensions.DependencyModel;
using System;
using System.Linq;
using System.Runtime.Loader;
using System.Reflection;
using System.Collections.Generic;

namespace ConsoleApp1
{
    class Program
    {
        static IEnumerable<Assembly> GetCandidateAssemblies(params string[] tagAssemblies)
        {
            if (tagAssemblies == null)
                throw new ArgumentNullException(nameof(tagAssemblies));
            if (tagAssemblies.Length == 0)
                throw new ArgumentException("At least one tag assembly name must be specified.", nameof(tagAssemblies));

            var context = DependencyContext.Load(Assembly.GetEntryAssembly());
            var loadContext = AssemblyLoadContext.Default;

            var referenceAssemblies = new HashSet<string>(tagAssemblies, StringComparer.OrdinalIgnoreCase);
            return context.RuntimeLibraries
                .Where(x => x.Dependencies.Any(d => referenceAssemblies.Contains(d.Name)))
                .SelectMany(x => x.GetDefaultAssemblyNames(context))
                .Select(x => loadContext.LoadFromAssemblyName(x));
        }

        static void Main(string[] args)
        {
            var l = GetCandidateAssemblies("newtonsoft.json").ToList();

        }
    }
}