C# 虚方法(virtual)

使用base调用父类中的虚方法。

class School
    {
        private string _name;
        public School(){ }
        public School(string name)
        {
            _name = name;
        }
        public virtual void Method_virtual()   //虚方法
        {
            Console.Write(_name + ":");
        }
    }
    class Teacher : School
    {
        public Teacher(string name):base(name){ }
        public override void Method_virtual()
        {
            base.Method_virtual();
            Console.WriteLine("给学生们上课！");
        }
    }
    class Student : School
    {
        public Student(string name) : base(name) { }
        public override void Method_virtual()
        {
            base.Method_virtual();
            Console.WriteLine("同学上台演讲！");
        }
    }
    class Monitor : School
    {
        public Monitor(string name) : base(name) { }
        public override void Method_virtual()
        {
            base.Method_virtual();
            Console.WriteLine("班长上台预留课后作业！");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            School[] school = new School[4];
            school[0] = new Teacher("李老师");
            school[1] = new Student("王二");
            school[2] = new Student("张三");
            school[3] = new Monitor("刘四");
            Console.WriteLine("上课铃声响了！");
            foreach (School s in school)
            {
                s.Method_virtual();
            }
            Console.ReadKey();
        }
    }