C# this和base

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

namespace
ConsoleApplication1
{
    class
Program
    {
       
static void Main(string[] args)
       
{
            Audi
audi = new
Audi("linQ",60);
           
audi[1] =
"A6";
           
audi[2] =
"A8";
           
Console.WriteLine(audi[1]);
           
audi.Run();
           
audi.ShowResult();
           
Console.ReadLine();
       
}
    }
    public class
Action
    {
       
public static void ToRun(Vehicle
vehicle)
       
{
           
Console.WriteLine("{0} is running.",
vehicle.ToString());
       
}
    }
    public class
Vehicle
    {
       
private string name;
        private int
speed;
        private string[] array =
new string[10];

        public
Vehicle()
       
{
       
}
       
//限定被相似的名称隐藏的成员
        public
Vehicle(string name, int speed)
       
{
           
this.name =
name;
           
this.speed = speed;
       
}
        public virtual void
ShowResult()
       
{
           
Console.WriteLine("The top speed of {0} is {1}.", name,
speed);
       
}
        public void
Run()
       
{
           
//传递当前实例参数
           
Action.ToRun(this);
       
}
       
//声明索引器，必须为this，这样就可以像数组一样来索引对象
       
public string this[int param]
       
{
            get {
return array[param];
}
            set {
array[param] = value; }
       
}
    }
    public class Car :
Vehicle
    {
       
//派生类和基类通信，以base实现，基类首先被调用
        public
Car()
            :
base("Car", 200)
        {
}

       
//指定创建派生类实例时应调用的基类构造函数
        public
Car(string name, int
speed)
            :
this()
        {
}

        public override void
ShowResult()
       
{
           
//调用基类上已被其他方法重写的方法
           
base.ShowResult();
           
Console.WriteLine("It‘s a car‘s
result.");
        }
   
}
    public class Audi : Car
   
{
        public
Audi()
            :
base("Audi", 300)
        {
}

        public Audi(string name, int
speed)
            :
this()
       
{
       
}
        public override void
ShowResult()
       
{
           
//由三层继承可以看出，base只能继承其直接基类成员
           
base.ShowResult();
           
base.Run();
           
Console.WriteLine("It‘s audi‘s
result.");
       
}

    }

}