public PostOffice(Product product)
{
this.product = product;
}
public double CalculateFee(int shipperId)
{
//product
var weight = 10;
var length = 30;
var width = 20;
var height = 10;
var product = new Product { Weight = weight, Length = length, Width = width, Height = height };
IShipper shipper = GetShipper(shipperId, product);
if (shipper != null)
{
var result = shipper.GetFee();
return result;
}
else
{
throw new NotImplementedException();
}
}
private IShipper GetShipper(int shipperId, Product product)
{
switch (shipperId)
{
case 1:
// 可以用 constructor, property setter, set function, factory method pattern
return new Blackcat(product.Weight);
case 2:
return new PostOffice(product);
default:
return null;
}
}
