public static BaseStrategy CreateInstance(string sOperate)
{
BaseStrategy strategy = null;
switch (sOperate)//基于配置文件和反射继续升级
{
case "+":
{
strategy = new PlusStrategy();
}
break;
case "-":
{
strategy = new MinusStrategy();
}
break;
case "*":
{
strategy = new MutiplyStrategy();
}
break;
case "/":
{
strategy = new DivisionStrategy();
}
break;
default:
{
Console.WriteLine("操作符号异常");
throw new Exception("操作符号异常");
}
}
return(strategy);
}
public Context(BaseStrategy strategy)
{
Strategy = strategy;
}
static void Main(string[] args)
{
Console.WriteLine("欢迎来到软谋教育.net高级班公开课之设计模式特训课，今天是Eleven老师为大家带来的策略模式");
bool isGoon = true;
while (isGoon)
{
Console.WriteLine("请输入第一个数字:");
string sInput1 = Console.ReadLine();
Console.WriteLine("请输入+-*/:");
string sOperate = Console.ReadLine();
Console.WriteLine("请输入第二个数字:");
string sInput2 = Console.ReadLine();
int iInput1 = 0;
int iInput2 = 0;
if (!int.TryParse(sInput1, out iInput1) || !int.TryParse(sInput2, out iInput2))
{
Console.WriteLine("请输入有效数字");
continue;
}
//检测0
int result = 0;
//switch (sOperate)//业务逻辑和算法混合在一起去了
//{
// case "+":
// result = iInput1 + iInput2;
// break;
// case "-":
// result = iInput1 - iInput2;
// break;
// case "*":
// result = iInput1 * iInput2;
// break;
// case "/":
//检测0
// result = iInput1 / iInput2;
// break;
// default:
// {
// Console.WriteLine("操作符号异常");
// continue;
// }
//}
//switch (sOperate)//业务逻辑和算法分开
//{
// case "+":
// {
// BaseStrategy strategy = new PlusStrategy();
// strategy.LeftInput = iInput1;
// strategy.RightInput = iInput2;
// result = strategy.Calculation();
// }
// break;
// case "-":
// {
// BaseStrategy strategy = new MinusStrategy();
// strategy.LeftInput = iInput1;
// strategy.RightInput = iInput2;
// result = strategy.Calculation();
// }
// break;
// case "*":
// {
// BaseStrategy strategy = new MutiplyStrategy();
// strategy.LeftInput = iInput1;
// strategy.RightInput = iInput2;
// result = strategy.Calculation();
// }
// break;
// case "/":
// {
// BaseStrategy strategy = new DivisionStrategy();
// strategy.LeftInput = iInput1;
// strategy.RightInput = iInput2;
// result = strategy.Calculation();
// }
// break;
// default:
// {
// Console.WriteLine("操作符号异常");
// continue;
// }
//}
//switch (sOperate)//引入context 1 可以添加额外处理 2为计算准备一些客户端不需要知道的数据
//{
// case "+":
// {
// BaseStrategy strategy = new PlusStrategy();
// Context context = new Context(strategy);
// result = context.Calculation(iInput1,iInput2);
// }
// break;
// case "-":
// {
// BaseStrategy strategy = new MinusStrategy();
// Context context = new Context(strategy);
// result = context.Calculation(iInput1, iInput2);
// }
// break;
// case "*":
// {
// BaseStrategy strategy = new MutiplyStrategy();
// Context context = new Context(strategy);
// result = context.Calculation(iInput1, iInput2);
// }
// break;
// case "/":
// {
// BaseStrategy strategy = new DivisionStrategy();
// Context context = new Context(strategy);
// result = context.Calculation(iInput1, iInput2);
// }
// break;
// default:
// {
// Console.WriteLine("操作符号异常");
// continue;
// }
//}//上端必须知道所有的算法，并负责选择算法
//不需要知道算法 也不负责选择 职责交给简单工厂
BaseStrategy strategy = SimpleFactory.CreateInstance(sOperate);
Context context = new Context(strategy);
result = context.Calculation(iInput1, iInput2);
Console.WriteLine("{0}{1}{2}={3}", iInput1, sOperate, iInput2, result);
}
Console.Read();
}