C#继承求 好朋友帮忙看下

Question

namespace ConsoleApplicationD
{
    class Person
    {
        private int age;        public int Age
        {
            get { return age; }
            set { 
                age = value;
                Console.WriteLine("请勿入内");
            }
        }
    }
}
---------------------------------------------
namespace ConsoleApplicationD
{
    class People:Person
    {
        
        public People() { 
            if(this.Age>18)
                Console.WriteLine("成年人");
            else
                Console.WriteLine("未成年");
        }
    }
}
-------------------------------------------------
namespace ConsoleApplicationD
{
    class Program
    {
        static void Main(string[] args)
        {
            
            People p = new People();
            p.Age = 80;
           
            Console.Read();
        }
    }
}
--------------------------------
运行结果
未成年
请勿入内
恳请高手帮忙解释下  程序是怎么走的 不太明白 谢谢你们了

Answer 1

....
People p = new People();
执行People类的构造函数,age还没有赋值,默认0，结果输出Console.WriteLine("未成年");
p.Age = 80;
执行Person类的Age属性的set,输出Console.WriteLine("请勿入内");