C#的接口

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    public abstract class Person
    {
        interface midClass
        {
            string name
            {
                set;
                get;
            }
            void Shout(string name);
        }
        interface bigClass
        {
            string name { set; get; }
            void Shout(string name);
            void run();
        }
        public class Grade : midClass, bigClass
        {
            string midClass.name
            {
                get;
                set;
            }
            void midClass.Shout(string name)
            {
                Console.WriteLine("小班{0}喊叫", name);
            }
            string bigClass.name
            {
                get;
                set;
            }
            void bigClass.Shout(string a)
            {
                Console.WriteLine("大班的{0}在大喊", a);
            }
            void bigClass.run()
            {
                Console.WriteLine("大班的在跑步");
            }
        }
        class Program
        {
            static void Main(string[] args)
            {
                midClass mid = new Grade();
                mid.name = "小王";
                mid.Shout(mid.name);
                Console.Read();
            }
        }
    }
}