static void Main(string[] args)
{
Console.WriteLine("Please select the Shipping method 1.FexEd 2.DHL 3.In House Shipping");
string input = Console.ReadLine();
int choice = 0;
bool result = int.TryParse(input, out choice);
if (result == true)
{
OrderProcessor orderProcessor = new OrderProcessor();
//这里体现null object pattern
//IShippingStrategy shippingStrategy = new InvalidShippingStrategy();//一般的写法
IShippingStrategy shippingStrategy = InvalidShippingStrategy.Instance;
switch (choice)
{
case 1:
shippingStrategy = new FedExShippingStrategy();
break;
case 2:
shippingStrategy = new DHLShippingStrategh();
break;
case 3:
shippingStrategy = new InHouseShippingStrategy();
break;
}
orderProcessor.ProcessOrder(shippingStrategy);
}
}
//这里体现null object pattern
//public void ProcessOrder(IShippingStrategy shippingStrategy=null) //没用null object pattern之前的写法
public void ProcessOrder(IShippingStrategy shippingStrategy)
{
#region 没用null object pattern之前的写法
//if (shippingStrategy != null)
//{
// shippingStrategy.ScheduleShipping();
//}
//else
//{
// Console.WriteLine("Invalid Shipping Strategy");
//}
#endregion
shippingStrategy.ScheduleShipping();
}
public StrategySelector(CountryShippingModel model)
{
switch (model.Country)
{
case Country.Netherlands:
shippingStrategy = new NetherlandsShippingStrategy();
break;
case Country.Belgium:
shippingStrategy = new BelgiumShippingStrategy();
break;
case Country.Other:
shippingStrategy = new OtherCountryShippingStrategy();
break;
}
ShippingStrategy = shippingStrategy;
}
public StrategyContext(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
public OnlineOrder(List<Product> orderItems, IShippingStrategy shippingMethod, IPrintMedium printMethod)
: base(orderItems, shippingMethod, printMethod)
{
}
public CostCalculationService_WithStrategy(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
/// <summary>
/// No default Constructor ensures that a Strategy object is always provided when constructing a ProductShipper
/// </summary>
/// <param name="shippingStrategy"></param>
public ProductShipper(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
public ShippingService(IShippingStrategy strategy)
{
this.strategy = strategy;
}
public CostCalculationService(IShippingStrategy shippingStrategy)
{
this.shippingStrategy = shippingStrategy;
}
public Order(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
public ShippingCostCalculatorService(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
public ShippingCalculation_WithStrategy(IShippingStrategy shippingStrategy)
{
this.shippingStrategy = shippingStrategy;
}
public ShopingCostCalculator(IShippingStrategy strategy)
{
ShippingStrategy = strategy;
}
public StrategyCostCalculation(IShippingStrategy strategyShipping)
{
_strategyShipping = strategyShipping ?? throw new ArgumentNullException(nameof(strategyShipping));
}
public double CalculateShipping(IShippingStrategy shippingStrategy, Order order)
{
return(shippingStrategy.CalculateShippingCost(order));
}
public Order(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
public double Calculate(Order order, IShippingStrategy shippingStrategy)
{
return(shippingStrategy.Calculate(order));
}
//In theory Chekout class should take an instance of IShippingStrategy instead of Order
//And our CalculateShipping method should take Order as a parameter
//This is all that is left after strategy. No more if else block
public decimal CalculateShipping(IShippingStrategy shippingMethod)
{
return(shippingMethod.CalculateShipping(order));
}
public ShipSalesOrderService(IShippingStrategy shippingStrategy)
{
_shippingStrategy = shippingStrategy;
}
