在C#中该如何阻止虚方法的覆写

    public class Animal
    {
        public virtual void WhoAmI()
        {
            Console.WriteLine("I am Animal.");
        }
    }

    public class Dog : Animal
    {
        public override void WhoAmI()
        {
            Console.WriteLine("I am Dog.");
        }
    }

    public class Dog1 : Animal
    {
        public new void WhoAmI()
        {
            Console.WriteLine("I am Dog1.");
        }
    }

    public class HomeDog : Dog
    {
        /// <summary>
        /// 采用new virtual来修饰来阻断覆写
        /// </summary>
        public new virtual void WhoAmI()
        {
            Console.WriteLine("I am HomeDog.");
        }
    }

    public class HuskyDog : HomeDog
    {
        public override void WhoAmI()
        {
            Console.WriteLine("I am HuskyDog.");
        }
    }

    [TestFixture]
    public class RunTest
    {
        [Test]
        public void NewAndOverrideRun()
        {
            Dog1 x = new Dog1();
            x.WhoAmI(); //I am Dog1.

            ((Animal)x).WhoAmI();//I am Animal.

            //new修饰的方法调用，取决于类型。
        }

        [Test]
        public void OverrideRun()
        {
            Dog x = new Dog();
            x.WhoAmI();//I am Dog.

            var x1 = x as Animal;
            x1.WhoAmI();//I am Dog.

            //override修饰符的方法调用，取决于实例化对象的类型
        }

        [Test]
        public void NewVirtualRun()
        {
            var x = new HomeDog();
            x.WhoAmI();//I am HomeDog.

            ((Dog)x).WhoAmI();//I am Dog.

            ((Animal)x).WhoAmI();//I am Dog.

            //new virtual阻断了方法的向上覆写。并且，Dog的覆写不受影响
        }

        [Test]
        public void NewVirtualThenOverrideRun()
        {
            var x = new HuskyDog();
            x.WhoAmI();//I am HuskyDog.

            ((HomeDog)x).WhoAmI();//I am HuskyDog.

            ((Dog)x).WhoAmI();//I am Dog.

            ((Animal)x).WhoAmI();//I am Dog.

            //new virtual 阻断向上的覆写，但是新的子类覆写它时不和原来覆写结果一样。
        }

    }