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 == 0)
        {
            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(1, 100).ToString();
        TextBox2.Text = rd.Next(1, 100).ToString();
        string[] oper = new string[] { "+", "-", "*", "/" };
        Random rdd = new Random();
        Label1.Text = oper[rdd.Next(1, 4)];
 
    }
    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。