抽象类和虚方法

namespace ConsoleApplication1
{
  
    public abstract class door
    {
        public void show()
        {
            Console.WriteLine("this is a");
        }

        public virtual void talk()
        {
            Console.WriteLine("this is t1");
        }

        public abstract void run();
    }

    public class door1:door
    {
        public new void show()
        {
            Console.WriteLine("this is b");
        }

        public override void talk()
        {
            Console.WriteLine("this is t2");
        }

        public override void run()
        {
            Console.WriteLine("this is run1");
        }
    }
    



}

program.cs中：

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            door d = new door1();
            d.show();
            d.talk();
            d.run();

            Console.ReadLine();

        }
    }
}

结果：

实例化时，若左边是父类右边是子类，实例化结束调用方法时，普通方法执行父类方法，虚方法执行子类方法