static void Main(string[] args)
{
TravelStrategy train = new TrainStrategy();
TravelContext context = new TravelContext("广州", "上海");
context.SetStrategy(train);
context.TravelFuction();
TravelStrategy air = new AirStrategy();
context.SetStrategy(air);
context.TravelFuction();
TravelContext context2 = new TravelContext2("广州", "上海", "最快");
TravelStrategy walk = new WalkfastStrategy();
context2.SetStrategy(walk);
context2.TravelFuction();
Console.ReadKey();
}
public void Travel(TravelContext t)
{
TravelContext2 t2 = (TravelContext2)t;
Console.WriteLine("从" + t2.Start + "到" + t2.End + t2.Way + "的步行方案");
}