generic.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Type listg = typeof(List<>);
            Type ilistg = typeof(IList<>);

            var Ts = listg.GetGenericArguments();

            bool implemented = ilistg.MakeGenericType(Ts).IsAssignableFrom(listg);

            Console.WriteLine(implemented);
        }
    }
}