static void Main(string[] args)
{
Console.WriteLine("Hello World!");
var duck = new Duck();
var plane = new Airplane();
var helicopter = new Helicopter();
var flyingThings = new List <IFlyable> {
duck, plane, helicopter
};
foreach (var thing in flyingThings)
{
if (thing is ITakeOff takeOff)
{
takeOff.TakeOff("Bahamas");
}
thing.Fly();
}
}
static void Main(string[] args)
{
var duck = new Duck();
var plane = new Airplane();
var helicopter = new Helicopter();
var flyingThings = new List <IFlyable> {
duck, plane, helicopter
};
foreach (var thing in flyingThings)
{
// check to see if this thing implement this interface
// if so add it to takeoff so that can be messed with
if (thing is ITakeOff takeOff)
{
takeOff.TakeOff("Bahamas");
}
thing.Fly();
}
}
static void Main(string[] args)
{
Duck d = new Duck();
//Duck对象d可以使用3种方法：
//1.自身定义的；
//2.父类定义的
//3.接口定义的
d.Fly();
d.Cook();
d.Swim();
//将子类（Duck）对象赋给基类变量
Bird b = d;
//现在只能使用基类定义的Fly()方法
b.Fly();
//将Duck对象赋给ISwin接口变量
ISwim s = d;
//现在只能使用接口定义的Swim()方法
s.Swim();
//将Duck对象赋给另一个实现的接口IFood接口变量
IFood f = d;
//现在只能使用接口定义的Cook()方法
f.Cook();
Console.ReadKey();
}