一 策略模式代码的编写
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web; /// <summary>
///Class1 的摘要说明
/// </summary> public interface Calculator //声明一个计算的接口
{
double Cal(double a,double b);
}
public class Add : Calculator //接口实现加法运算
{
public double Cal(double a, double b)
{
double result = ;
result = a + b;
return result;
}
}
public class Sub : Calculator //接口实现减法运算
{
public double Cal(double a, double b)
{
double result = ;
result = a - b;
return result;
}
}
public class Mul : Calculator //接口实现乘法运算
{
public double Cal(double a, double b)
{
double result = ;
result = a * b;
return result;
}
}
public class Div : Calculator //接口实现除法运算
{
public double Cal(double a, double b)
{
double result = ;
result = a / b;
return result;
}
}
public class Environment //定义那个需要动态改变算法的对象
{
private Calculator calculate;
public Environment(Calculator calculate)
{
this.calculate = calculate;
}
public double Cal(double a, double b, String m) //返回运算结果
{
return this.calculate.Cal(a, b);
}
}
二 asp.net后台代码的书写，并且引用策略模式
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO; public partial class yunsuan : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ }
protected void bianji_Click(object sender, EventArgs e)
{
Environment environment = null;
double a = Convert.ToDouble(left.Text); //为相关的变量赋值
double b = Convert.ToDouble(right.Text);
string m = fuhao.Text;
switch (m)
{
case "+":
environment = new Environment(new Add()); //策略模式的引用
break;
case "-":
environment = new Environment(new Sub()); break;
case "*":
environment = new Environment(new Mul()); break;
case "/":
environment = new Environment(new Div()); break;
default:
break;
} string answer = environment.Cal(a, b, m).ToString(); if (TextBox4.Text == answer.ToString())
{
Response.Write("回答正确"); //判断用户回答是否正确，并且给出相关的提示 }
else
{
Response.Write("回答错误"); }
ListBox1.Items.Add(left.Text + fuhao.Text + right.Text + Label1.Text + answer + "\n"); //式子保存到listbox控件中，并且给出正确答案
left.Text = "";
fuhao.Text = "";
right.Text = "";
TextBox4.Text="";
} }
三 界面的运行效果