static void Main(string[] args)
{
CupOfCoffee coffee = new CupOfCoffee();
CupOfTea tea = new CupOfTea();
HaveADrink(coffee);
HaveADrink(tea);
}
//Add a new Coffees
public async Task <CupOfCoffee> AddCoffee()
{
await Initialize();
var coffee = new CupOfCoffee
{
DateUtc = DateTime.UtcNow,
//MadeAtHome = atHome,
//OS = Device.OS.ToString()
};
await coffeeTable.InsertAsync(coffee);
await SyncCoffee();
//return coffee
return(coffee);
}
public CoffeeExtrasPageViewModel(CupOfCoffee cupOfCoffee)
: base(cupOfCoffee)
{
}
} // 派生类
static void Main(string[] args)
{
#region 面向对象编程的含义
// 构造函数
CupOfCoffee myCup1 = new CupOfCoffee(); // 默认
CupOfCoffee myCup2 = new CupOfCoffee("Blue Mountain"); //非默认
// 析构函数
// 用于在删除对象实例前完成的操作
// 静态构造函数
// 不能直接调用
// 静态类
Console.WriteLine("Helloworld!"); // Console
#endregion
#region OOP技术
// 接口
myCup1.TestForInterface();
// 可删除的对象
// IDisposable
using (CupOfCoffee myCup3 = new CupOfCoffee("Blue Mountain"))
{
// ...
}
CupOfCoffee myCup4 = new CupOfCoffee();
using (myCup4)
{
// ...
}
// 继承
Animal animal = new Animal();
animal.EatFood();
Chicken chicken = new Chicken();
chicken.EatFood();
chicken.UseProtectedEatFood();
// 抽象类
// 抽象类不能被实例化
// 多态
Cow myCow = new Cow(); // 派生类型变量
Animal myAnimal = myCow; // 派生类型变量赋给基本类型变量
myAnimal.EatFood(); // 访问基类方法
Cow myNewCow = (Cow)myAnimal; // 转换为派生类变量
myNewCow.Moo(); // 调用派生类方法
// 接口的多态性
IEatFood eatFoodInterface;
eatFoodInterface = myAnimal;
eatFoodInterface.EatFood();
eatFoodInterface = myCow;
eatFoodInterface.EatFood();
// 集合
Animal[] animals = new Animal[5];
#endregion
// 运算符重载
Cow myCow1 = new Cow(100);
Cow myCow2 = new Cow(200);
Console.WriteLine("myCow1 < myCow2? " + (myCow1 < myCow2 ? "true" : "false"));
Console.WriteLine("myCow1 > myCow2? " + (myCow1 > myCow2 ? "true" : "false"));
// 事件
// -
// 引用类型和值类型
// -
Console.ReadKey();
}
public CoffeeTypeSizePageViewModel(CupOfCoffee cupOfCoffee)
: base(cupOfCoffee)
{
}
void CancelOrder()
{
_cupOfCoffee = null;
this.OnRequestClose();
}
public CoffeeWizardViewModel()
{
_cupOfCoffee = new CupOfCoffee();
this.CurrentPage = this.Pages[0];
}
protected CoffeeWizardPageViewModelBase(CupOfCoffee cupOfCoffee)
{
_cupOfCoffee = cupOfCoffee;
}
