策略模式，ASP.NET实现

策略模式，ASP.NET实现

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;

 /// <summary>
 ///Class1 的摘要说明
 /// </summary>
 interface  Iface
 {
     int Calation(int a, int b);

 }
 public class Add:Iface
 {
     public int Calation(int a,int b)
     {
         return a+b;
     }
 }
 public class Sub : Iface
 {
     public int Calation(int a, int b)
     {
         return a - b;
     }
 }
 public class Mul : Iface
 {
     public int Calation(int a, int b)
     {
         return a * b;
     }
 }
 public class Div : Iface
 {
     public int Calation(int a, int b)
     {
         if (b == )
         {
             throw new Exception("除数不能为零！");

         }

         else
         {
             return a / b;
         }

     }
 }
 public class Faction
 {
     private Iface iface;
     public Faction(string operation)
     {
         switch (operation)
         {
             case "+":
                 iface = new Add();
                 break;
             case "-":
                 iface = new Sub();
                 break;
             case "*":
                 iface = new Mul();
                 break;
             case "/":
                 iface = new Div();
                 break;
         }
     }
     public int Calationss(int a, int b)
     {
         return iface.Calation(a, b);

     }
 }

Default.aspx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ti();
        }
    }
    public void ti()
    {
        Random rd = new Random();
        TextBox1.Text = rd.Next(, ).ToString();
        TextBox2.Text = rd.Next(, ).ToString();
        string[] oper = new string[] { "+", "-", "*", "/" };
        Random rdd = new Random();
        Label1.Text = oper[rdd.Next(, )];

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Faction faction = new Faction(Label1.Text);
        int a = int.Parse(TextBox1.Text);
        int b = int.Parse(TextBox2.Text);
        string anster = faction.Calationss(a, b).ToString();
        if (TextBox3.Text == anster)
        {
            Response.Write("回答正确！");
        }
        else
        {
            Response.Write("回答错误！");
        }
        TextBox3.Text = "";
        ti();
    }
}

测试

第一题做的是不是正确，在第二题中提示。