namespace JustTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var t = new Hashtable();
            t.Add(new user { }, 1);
            t.Add(new user { }, 2);
        }
    }

    class user
    {
        public override int GetHashCode()
        {
            Console.WriteLine("GetHashCode校验");
            return 1;
        }
        public override bool Equals(object o)
        {
            Console.WriteLine("Equals校验");
            return base.Equals(o);
        }
    }
}