public void Can_DiscountA_ApplyDiscount()
{
DiscountA dis = new DiscountA();
decimal res = dis.ApplyDiscount(100);
Assert.AreEqual(90, res);
}
static void Main(string[] args)
{
/*策略模式 实际应用时，可以与简单工厂配合使用，或者将具体实现类配置保存在配置文件中
*
* （1）提供了对开闭原则的完美支持，用户可以在不修改原有系统的基础上选择具体算法或行为，也可以灵活地增加新的算法或行为。
*
* （2）避免了多重的if-else条件选择语句，利于系统的维护。
*
* （3）提供了一种算法的复用机制，不同的环境类可以方便地复用这些策略类。*/
IDiscount discountA = new DiscountA();
var price = discountA.Calculate(18);
Console.WriteLine(price);
IDiscount discountB = new DiscountB();
price = discountB.Calculate(18);
Console.WriteLine(price);
Console.ReadKey();
}
public List <ProductDetail> GetProductDetails(List <Cart> cartItems, List <Product> products)
{
var productDetails = new List <ProductDetail>();
foreach (var item in cartItems)
{
if (products.Any(x => x.Name == item.Product))
{
var product = products.First(x => x.Name == item.Product);
var productDetail = new ProductDetail();
productDetail.Product = item.Product;
productDetail.Quantity = item.Quantity;
productDetail.Price = product.Price;
//ProcessDiscountLogic
IDiscount discount = new NoDiscount();
switch (product.DiscountType)
{
case "DiscountA":
discount = new DiscountA();
break;
case "DiscountB":
discount = new DiscountB();
break;
case "DiscountCD":
discount = new DiscountCD();
break;
default:
break;
}
productDetail.Price = discount.ApplyDiscount(productDetail);
productDetails.Add(productDetail);
}
}
return(productDetails);
}
