using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Reflection;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;

Animal value = new Cat();
Type runtime = value.GetType();
Console.WriteLine($"runtime:{runtime.Name}");
Console.WriteLine($"base-accepts:{typeof(Animal).IsAssignableFrom(runtime)}");
Console.WriteLine($"derived-accepts:{typeof(Cat).IsAssignableFrom(typeof(Animal))}");
class Animal { }
sealed class Cat : Animal { }