1、通过IsAssignableFrom()方法判断的问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            var type1 = typeof(List<>);
            var type2 = typeof(IEnumerable<>);
            //return false
            Console.WriteLine(type2.IsAssignableFrom(type1));
            //通过IsAssignableFrom
            //()方法判断，方法返回是false，
            //判断不出来它们之间的继承关系。           
        }
    }
}

2、通过自定义方法判断它们之间的继承关系

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApplication
{

    class Program
    {
        public static bool IsAssignableToOpenGenericType(Type givenType,
        Type genericType)
        {
            var interfaceTypes = givenType.GetInterfaces();
            foreach (var it in interfaceTypes)
            {
                if (it.IsGenericType 
                && it.GetGenericTypeDefinition() == genericType)
                    return true;
            }
            if (givenType.IsGenericType 
            && givenType.GetGenericTypeDefinition() == genericType)
                return true;
            Type baseType = givenType.BaseType;
            if (baseType == null) return false;
            return IsAssignableToOpenGenericType(baseType, genericType);
        }

        static void Main(string[] args)
        {
           //IsAssignableToOpenGenericType()使用示例代码
           var typ1 = typeof(List<>);
           var typ2 = typeof(IEnumerable<>);
           //true, List<>的类型定义包含一个IEnumerable<>
           Console.WriteLine(IsAssignableToOpenGenericType(typ1,typ2));
           //false,IEnumerable<>的类型定义不包含List<>
           Console.WriteLine(IsAssignableToOpenGenericType(typ2,typ1));
        }
    }
}